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Integrated Coastal Resources Database (ICRD)
Integrated Coastal Zone Management Plan Project (ICZMPP)
Water Resources Planning Organization (WARPO)
Ground Truthing of Inventory
of
Islands and Chars in the Coastal Zone
Dhaka
June 2005
Prepared by
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i
Preface
Ground truthing inventory of islands in the coastal zone is to assist the Integrated Coastal Zone
Management Plan (ICZMP) Project by making the information of coastal islands easily available. The
study is one of the components of the Knowledge gap filling of Integrated Coastal Resources
Database (ICRD). This was initiated as a short-term study titled Inventory of Coastal and Estuarine
Islands & Chars in 2001 by PDO-ICZMP. The former study bring forward a recommendation to
initiate an extensive ground truthing and further updating of the collected information. CEGIS has
been given the responsibility to proceed on with the suggested methodology for carrying out the study
stated in the Terms of Reference (ToR) for development of ICRD. The whole activity is planned
considering the issues associated with the future incorporation and updating of the information and
easy management of the presently available information. It involves investigation of some primary
and secondary information sources of the coastal area. Through this study some essential andfundamental issues were evolved which have been tried to deal with. While demarcating and defining
the marine/estuarine and riverine region and islands and chars, the physical, socio-economical,
environmental and development aspects of the coastal area have been considered.
This report is the documentation of the approach, methodology, activities and outputs of the study. It
also includes the limitations and recommendations for the future activities necessary to improve the
understanding of the Islands and Chars of the coastal region of Bangladesh from all possible aspects.
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ii
Study Team of CEGIS
Malik Fida A Khan, Project Manager, ICRD, CEGIS
Chitta Ranjan Gupta, Task Leader, ICRD, CEGIS
Motaleb Hossain Sarker, GIS and Database Specialist, CEGIS
Md. Mostafizur Rahman, GIS Analyst, CEGIS
Mohammad Shahidul Islam, RS Analyst, CEGIS
Sadik Ahmed, GIS Analyst, CEGIS
Md. Mominuzzaman, Technical Assistant, CEGIS
Md. Torikul Islam, Technical Assistant, CEGIS
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Acknowledgement
The study is the concerted efforts of the CEGIS team with the valuable advices from WARPO and
ICZMP personnel. Supports of Mr. HS Mozaddad Faruque, Director General of WARPO and Mr.Giasuddin Ahmed Chowdhury, Executive Director of CEGIS are gratefully acknowledged.
Suggestions and guidance from Mr. M.A. Baten, PSO (IT) and Mr. Kazi Rezaul Karim. SSO of
WARPO were very much valuable for this study. Mr. M. Rafiqul Islam, Team Leader and Abu M.
Kamal Uddin, Senior National Expert of ICZMP were always given us pragmatic solutions to
problems arose during this study. Mr. Maminul Haque Sarker, Morphologist, Ms. Iffat Huque,
Remote Sensing Expert, Mr. Sultan Ahmed, Program Manager Liaison and Mr. Ehsan Hafiz
Chowdhury, Database Expert, of CEGIS were contributed to this study with their precious expertise
in respective fields. Thanks to Mr. Sayeefur Rahman Rizvi for his support in designing the cover
page.
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iv
Summary
Islands and chars in the coastal region has been categorized into 3 different classes: 1) Detached
riverine char 2) Chars attached with mainland 3) Marine & Estuarine Islands. This study identified185 islands and chars in the coastal region. Among these 21 chars are identified as Detached
riverine char,92 charsare identified as Chars attached with mainland and 72 islands are identified
as Marine & Estuarine Islands. Marine & Estuarine Islands are those which are located within the
area with tidal range of 2 to 6m (Macro and Meso-tidal). Associated information of islands and chars
were collected mainly from Marine & Estuarine Islands. The following summary information is
prepared on the basis of the primary and secondary information sources and field visits.
The Marine & Estuarine Islands, hereafter called as islands, are located mostly in 11 coastal districts
(Bagerhat, Barguna, Bhola, Chittagong, Cox'S Bazar, Khulna, Lakshmipur, Noakhali, Patuakhali,
Pirojpur and Satkhira). The islands area covers 15% of the total districts area. The highest 20 islands
have been found in Patuakhali district. The area of the islands is36%
of the total district area ofPatuakhali. The district Bhola has the second highest 18 islands, which is 79% of the entire district
region.
The total population in these islands are 3 millions. 13% of the total population of the above
mentioned 11 coastal districts is living in the islands. Bhola has the highest 93% district population
living in the islands. No permanent population has been found living in the islands in Barguna,
Khulna, Pirojpur and Satkhira districts. Among these 72 islands, 35 have no permanent population.
The average population density and household size of these islands are about 568 person/sq. km. and
8 respectively.
In the above mentioned 72 islands there are only 2 cyclone shelters for every 10,000 people. Islands
located in Bagerhat, Barguna, Khulna, Pirojpur and Satkhira have no cyclone shelters. There are only6 cyclone shelters for every 10,000 people (which is the highest among these 11 districts) in the
Noakhali district. Among the 72 islands, only 14 islands are protected by embankments or polders;
rests 58 inlands are unprotected.
17% of the island area is covered with mangrove forest. Rest of the area is covered by settlement,
potential agricultural land, fellow land and Uri grass.
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Table of Contents
Preface ........................................................................................................................................................... i
Study Team of CEGIS ................................................................................................................................ ii
Acknowledgement ...................................................................................................................................... iii
Summary ..................................................................................................................................................... iv
Table of Contents ........................................................................................................................................ v
List of Figures ............................................................................................................................................. vi
List of Tables .............................................................................................................................................. vi
Annexes ....................................................................................................................................................... vi
Abbreviations ............................................................................................................................................ vii
Chapter 1 Introduction ............................................................................................................................... 1
1.1 Background .................................................................................................................................... 1
1.2 Objective ........................................................................................................................................ 1
1.3 Output ............................................................................................................................................ 11.4 Scope of work ................................................................................................................................ 1
Chapter 2 Approach and Processes ........................................................................................................... 32.1 Approach ....................................................................................................................................... 3
2.2 Processes ........................................................................................................................................ 3
Chapter 3 Process Description, Analysis and Outputs ............................................................................ 5
3.1 Introduction ................................................................................................................................... 5
3.2 Processes ........................................................................................................................................ 5
3.2.1 Evaluation of different sources .....................................................................................5
Primary data source.......................................................................................................................... 5
Satellite Imagery ......................................................................................................................... 5
Field Data .................................................................................................................................... 6Secondary data source...................................................................................................................... 7
FINNMAP................................................................................................................................... 7
SoB Topo Sheet .......................................................................................................................... 7
Forest Map .................................................................................................................................. 7
Settlement Database, NWRD ...................................................................................................... 7
Union Database, NWRD and Mauza database, CEGIS .............................................................. 7
Inventory report on char lands in southwest coastal region of Bangladesh, CDP ...................... 7
3.2.2 Data Collection & Extraction .......................................................................................8
Data Collection from field visit ....................................................................................................... 8
Data Collection from ICZMP Technical Note ................................................................................. 9
Data extracted from Satellite Images ............................................................................................... 9
Data extraction from Settlement, Union, and Mauza databases ...................................................... 9
3.2.3 Identification of islands and chars ..............................................................................10
3.2.4 Classification of islands and chars .............................................................................10
3.3 Outputs ........................................................................................................................................ 13
Chapter 4 Information System ................................................................................................................ 19
4.1 Objectives .................................................................................................................................... 19
4.2 Directory structure ....................................................................................................................... 19
4.3 Working with Application ........................................................................................................... 19
4.3.1 CIIS organization .......................................................................................................19
Introduction .................................................................................................................................... 20Map viewer .................................................................................................................................... 20
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Zoom In, Zoom Out .................................................................................................................. 21
Pan ............................................................................................................................................ 21
Full extent ................................................................................................................................. 21
Map Tips ................................................................................................................................... 21
Labeler ...................................................................................................................................... 21
Find ........................................................................................................................................... 22Add Text ................................................................................................................................... 22
Pointer ....................................................................................................................................... 22
Attribute data ................................................................................................................................. 22
Identify Result ................................................................................................................................ 23
4.3.2 Copy and Export Map ................................................................................................24
4.3.3 Labeling and classifying facilities ..............................................................................24
Chapter 5 Conclusions .............................................................................................................................. 25
References .................................................................................................................................................. 26
List of Figures
Figure 2.1: Process Diagram ......................................................................................................................... 4
Figure 3.1: LandSat TM, 2003 ...................................................................................................................... 6
Figure 3.2: Deferent tide level in Meghna Estuary. (Source: Hydro-morphological dynamics of the
Meghna Estuary, MESII, July 2001) ....................................................................................... 12
Figure 3.3: Cluster Island ............................................................................................................................ 13
Figure 5.1: Introduction Page ..................................................................................................................... 20
Figure 5.2: The main page of the CIIS ....................................................................................................... 20
Figure 5.3: Tools in the toolbar ................................................................................................................... 21
Figure 5.4: Find Result ............................................................................................................................... 22Figure 5.5: Attribute Information................................................................................................................ 23
Figure 5.6: Identify Result .......................................................................................................................... 23
Figure 5.7: Symbol Properties .................................................................................................................... 24
List of Tables
Table 3.1: Information Categorization .......................................................................................................... 9
Table 3.2: List of sources and corresponding codes ................................................................................... 10
Table 3.3: Island/char class table ................................................................................................................ 11
Table 3.4: Bundle information of the table ................................................................................................. 15Table 3.5: List of the field names and its description ................................................................................. 16
Table 3.6: Number of islands in each class ................................................................................................. 17
Table 3.7: District wise summary of Islands ............................................................................................... 17
Table 3.8: Island summary table. ................................................................................................................ 18
Annexes
Annex I: Field Survey Form
Annex II: Map of Islands/Chars
Annex III: Inventory of Coastal Islands/CharsAnnex IV: Location Information of Islands/Chars (ArcView GIS Table)
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Abbreviations
BBS Bangladesh Bureau of Statistics
BIWTA Bangladesh Inland Water Transport Authority
BTM Bangladesh Transverse Mercator
BWDB Bangladesh Water Development Board
CDP Coastal Development Partnership
CDSP Char Development and Settlement Project
CEGIS Centre for Environmental and Geographic Information Services
CERP Coastal Embankment Rehabilitation Project
CIIS Coastal Island/Char Information SystemDAE Department of Agricultural Extension
DLRS Directorate of Land Record and Survey
DoF Department of Fisheries
EEZ Exclusive Economic Zone
FD Forest Department
GCP Ground Control Point
ICRD Integrated Coastal Resources Database
ICZMP Integrated Coastal Zone Management Plan
LGED Local Government Engineering Department
MES Meghna Estuary Study
MoL Ministry of Land
PDO Program Development Office
SoB Survey of Bangladesh
WARPO Water Resources Planning Organization
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1
Chapter 1
Introduction
1.1 BackgroundGround Truthing Inventory of Islands and Chars is one of the activities for development of Integrated
Coastal Resources Database (ICRD) of Integrated Coastal Zone Management Plan project of Water
Resources Planning Organization to verify and update the existing inventory with latest available
information and knowledge. The nature of the coastal zone, part of which is in a very dynamic delta,
is deferent from the rest of the country. The complex part is located at the human-nature interface. For
better understanding of these complexities, quality and reliable up-to-date information is required for
coastal area. A considerable amount of information has been generated under different projects in the
coastal area and estuaries of Bangladesh. This valuable information is scatter rather to keep available
from a single source. The Ground Truthing Inventory of Islands and Chars in the Coastal Zone isone of the components of the Knowledge Gap Filling which involves collection and collation of
primary and secondary information about the coastal Islands and Chars.
The coastal zone of Bangladesh consists of 147 Upazillas of 19 Districts and Exclusive Economic
Zone (EEZ) in the Bay of Bengal. This area has huge resource potential as well as is prone to
vulnerability like tide, cyclones, storm surge, salinity intrusion etc.
To explore, identify and utilize the resources, to reduce the vulnerabilities of the coastal lives for
improving the living standard of costal people by enhancing their livelihood capacities (poverty
reduction) and to coordinate and harmonize the development activities of all implementing agencies
working in coastal area for maintaining a healthy eco-system, the concept of Integrated Coastal Zone
Management (ICZM) has been evolved.
ICRD which is one of the 6 outputs of ICZMPP, will provide better information and understanding of
coastal conditions and processes. ICRD has an important function in structuring a sustainable ICZM.
1.2 ObjectiveThe overall objective of the study is to investigate the condition of the coastal islands and chars. The
specific objectives are to gather and verify the information on the location and area; demography and
livelihood condition; socio-economic condition; opportunities, infrastructure, communications,
vulnerabilities, involvement of government and non-government organizations / institutions in the
coastal islands and chars.
1.3 OutputThe direct outputs from this study are:
- Map of islands showing their location, administrative identity- Information System of the coastal island and char- Inventory report.
1.4 Scope of workScope of work includes the followings:
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- Identification of island and chars, determining area and distance from mainland etc.- Collection of secondary information from different sources, such as, BBS, LGED,
BWDB, FD, DoF, DLRS;
- Review of studies on islands and chars carried out by different organizations e.g. MassLine Media Centre, CDP etc.;
- Preparation of fact sheet for each of the islands containing available information from thesecondary sources;
- Visiting islands verify and correct the information and fill the gaps;- Compilation and updating information and preparing inventory report.
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Chapter 2
Approach and Processes
2.1 ApproachA stepwise approach has been developed for verifying and updating the inventory of the coastal
islands and chars of Bangladesh. This approach also includes the updating and ground truthing of
existing information of islands and chars and collection of additional data and information from field
survey and other agencies which are involved in the development and management of coastal island
and chars. Extensive field visits have been carried out to identify islands and chars. The inlands and
chars have been selected to visit in consultation with planners involved for development of ICZMP.
The adopted approaches are summarized below:
- Preparing a checklist and questionnaire after preliminary screening of the availableinformation and having discussions in relevant groups.- Searching literatures including available reports, books, maps, data for information on
selected parameters.
- Preparing fact sheet on islands compiling and synthesizing extracted information.- Developing semi-structured questionnaire/checklist for field survey.- Performing field survey work using questionnaire/check list to identified and selected
islands and chars.
- Formations of teams compose of 2/3 members for each team.- Compiling information collected from the surveys and revisit fact sheets- Preparing the inventory report and maps.
2.2 ProcessesInitially the primary and secondary sources have been identified. The sources were evaluated on the
basis of, completeness, history, purpose of production, process description and recentness. The
sources were found to be useful for attribute data collection and location identification. Figure 2.1
shows field survey, ICZMP technical note, satellite image, union and mauza map and settlement map
were used for both attribute data collection and location identification. In addition, Bangladesh map of
coastal area prepared by BIWTA (Finn map), SoB topographic map, forest map and map prepared byCDSP were used to identify the location of island and chars as well as cross check the collected data
and information.
A data conversion tool has been developed for extracting data from the different sources. GIS layers
were overlaid on each other to verify the location of the islands/chars. The final location information
has been stored in GIS database format.
The associated attribute information of islands and chars is also stored in the MS Access database
which can be linked with the Arcview GIS system. This attribute information can also be linked with
spatial data of islands and chars to classify on the basis of its characteristics (Marine/Estuarine,
Riverine etc), sources used for identification etc.
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A information system has been developed which is independent of any GIS software for viewing,
search and performing queries, presentation and reporting. The system is fed by information from
Access database as well as Arcview GIS file. This system is capable for viewing both the attribute and
spatial information of islands and chars.
Figure 2.1: Process Diagram
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Chapter 3
Process, Analysis and Outputs
3.1 IntroductionThe information collected under this study from the primary and secondary sources are used for
ground truthing of the existing information as well. However, extensive field visit and desk work has
been carried out to fill up the gap of the island and char information. All the collected information has
been stored in a single database.
The processes involve:
- Evaluation of different sources- Data collection and extraction- Identification of islands and chars- Classification of islands and chars
3.2 Processes3.2.1 Evaluation of different sources
The data sources are clustered into primary and secondary categories depending on the contain of
information. Primary source is identified as any data or information gathered by observing
phenomena or surveying respondents for this study and secondary data are the collected data for any
other study. The list of the sources which have been consulted for the identification of the islands and
chars are given below:
Primary data source
Satellite Imagery
Initially a mosaic (whole coastal zone) of dry-season (January and February) LandSat TM images
(30m resolution) of 2003 was used for identifying islands and chars. Where necessary available IRS
panchromatic (6m resolution) dry season (January, February and March) images of different years
(2002-04) were used to facilitate the identification process. IRS-P6 LISS III (23.5m resolution)
images of 2005 acquired in dry season (January and February) were used to calculate total area, forest
and land area. The boundaries of island and chars were delineated from the IRS-P6 LISS III. The
image is processed and geo-referenced by using the GCP data bank of CEGIS.
Geo-referencing of each image has been done using colleted ground control points (GCPs) for
representing the features precisely in correct location.
A set of 25 GCPs for each image was taken from 1:50,000 color maps derived from 1989 high
resolution SPOT satellite images. Since there are few preferred features within the river corridor,
other features such as ponds and uniquely shaped water bodies were used. For each GCP, the map
coordinates were obtained from the satellite image map and entered into a data file together with the
file coordinates of the same GCP identified in the digital satellite image. The coordinate pairs were
then used to compute a first order transformation matrix which was applied to the entire digital
satellite image to compute rectified coordinates for each image pixel. .
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Using this procedure, each raw satellite image was re-sampled, using the nearest neighbor algorithm,
and transformed into a file referenced to the Bangladesh Transverse Mercator (BTM) projection.
Figure 3.1: LandSat TM, 2003
Field Data
The major key activity of ground truthing of existing data was to visit the islands and chars to collect
missing information and to verify the existing information also. A fact sheet was filled up for each
visit to island and char. This fact sheet also was used for preparing structured questionnaire/checklist
for the field work (see Annex I). Teams have been formed (each team composed of 2/3 persons) to
work together with GCP team in some cases. With the feedback from first field visit the selection of
islands and chars to be visited and a complete field survey planning have been prepared. It has been
decided to exclude data items to be collected through field survey, which are difficult to define. The
survey was mostly limited only in the estuarine islands. NGO's working in the coastal area were
consulted.ICZMP Technical Note
ICZMPP has published a series of technical notes on various coastal issues of which PDO-ICZMP
paper no. 06 titled Inventory of Coastal and Estuarine Islands & Chars is the basis of this study.
This technical note is reference document with all relevant information available on coastal islands
and chars. The study was done in 2001 and further modified in 2002.
Statistical yearbooks of BBS, reports of the Bangladesh Water Development Board (BWDB),
Ministry of Land (MoL), Department of Fisheries (DoF), Forest Department (FD), Department of
Agricultural Extension (DAE), projects (MES, CDSP, EGIS, and CERP), CDP a NGO working at
Khulna were used. Base maps of LGED; aerial photographs obtained through EGIS have also been
consulted. A limited field survey was done in the chars adjacent to the Sundarban Reserved Forest.
The following activities have been accomplished.
a) Relevant documents from the organizations were collected.
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b) All relevant information available on coastal islands and chars from different sources were
compiled.
c) An inventory report accommodating relevant information was prepared.
Secondary data source
FINNMAP
FINNMAP is only source of high resolution published map in 1:10000 scale of coastal area is also
used for this activity. These maps were complied from aerial photographs taken in 1990 by
FINNMAP Oy and field identification and compilation was done in 1998. These maps are published
by Bangladesh Inland Water Transport Authority (BIWTA) in co-operation with FINNIDA (Finland)
and the Commission of the European Communities.
SoB Topo Sheet
Survey of Bangladesh (SOB) is the only national surveying and mapping agency in Bangladesh. SOB
is creating topographic database at a scale of 1:50,000 for feeding GIS and targeted to capture data of
the entire country by year 2004. Topographic maps of the Bengal were generated during the lastquarter of 18th century covering whole Bangladesh at a scale of 1:50,000. Map updating is a regular
process and done in every five to seven years. Presently SOB is digitally updating the base map of
Bangladesh. (Source: http://www.bangladeshgov.org/mod/sob/sobweb.htm)
Forest Map
Forest base map was derived from 1:50,000 SPOT satellite imagery of 1989 which was later amended
using 1:15,000 air photography in 1995 under the Forest Resources Management Project of
Bangladesh Forest Department. The administrative boundaries were derived from maps edited by
FAO/UNDP project Integrated Resources Development of the Sundarbans Reserved Forests , 1995.
The international and jurisdictional boundaries have been mapped in accordance with the available
base information. The boundaries of the Reserved Forests have been taken from existing maps. It has
been suggested to use these maps for only operational purposes and not to quote as an authority for
any legal purpose.
Settlement Database, NWRD
Spatial data layer of settlement area was delineated by Local Government Engineering Department
(LGED) using SPOT Image 1989-90, Aerial Photograph 1983-84,Topographic Maps, and ground
truthing under the project of UNDP/ILO, BGD/89/041. NWRD of WARPO has collated this
information and updated using recent satellite image. This data layer contains information of the area,
all administrative unit name of each of the settlements. CEGIS has updated this data layer in 2005 by
using IRS image of 6 m resolution.Union Database, NWRD and Mauza database, CEGIS
NWRD possesses different administrative boundaries of Bangladesh. The source of this dataset is
Police Station Maps published by Directorate of Land Record and Survey (DLRS), which were
compiled between 1922-1964. Some maps were also compiled after this period. Scale of these maps
were 1"=1mile. Reserve Forest maps published by Survey of Bangladesh (SoB) were used for
Sundarbans region. Attribute information were attached according to the geo-master database
collected from Bangladesh Bureau of Statistics (BBS).
Inventory report on char lands in southwest coastal region of Bangladesh, CDP
Coastal Development Partnership (CDP) initiated the process of preparing the inventory of char landsin the southwest coastal region in 2001-02 with the help of a network of 13 NGOs. A questionnaire
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was prepared and distributed to fill it up by interviewing people and by focus group discussion.
Secondary information was collected from Upazilla settlement offices, AC land, and Union Parisad
offices.
3.2.2 Data Collection & Extraction
Existing sources of information on the islands and chars were reviewed for identification of Islands
and chars. Satellite images have been used for preparing a base map for field survey and finally was
used for identifying islands, estimating area, location, distance from mainland etc. Data on the islands
and chars through different secondary sources like, BBS, LGED, BWDB, FD, DoF, DLRS were
studied. The data from these sources could not be used directly because of the spatial resolution which
are collected by a administrative unit wise. The administrative unit wise data couldnt be used, as the
boundary of the Islands/chars sometimes, if not always, dont follow the administrative boundary.
These secondary data has been used to cross check the information gathered from the primary sources.
Data Collection from field visit
Initially, a field visit program was done at and around Saint Martins, Moheskhali, Kutubdia to have areconnaissance survey. With the feedback from this field visit, the selection of islands and chars to be
visited and a complete field survey planning was prepared. Field survey activities are summarized on
the basis of the experience of first field visit . These are described below:
- Information which are not possible to quantify through field visit should be excluded from thesurvey form.
- Additional measure was taken for the same name of more than one islands and chars- Islands were defined as those which are isolated from main land and mainly located in the sea.
The survey will be limited for the estuarine islands and char for basic data.
-
NGO's working in the coastal islands and char will be consulted.- Approximate number of Islands and chars will be counted using satellite imageConsidering the above criterion, information to be collected from filed is categorized into basic and
optional information. Basic information comprises somewhat defined fields which can be collected
almost accurately through the field team. Basic information includes the followings:
- Administrative (name of island, local name and surroundings)- Location (Thana, union, Mouza and GPS Reading etc)- Safety (Embankment, cyclone shelter, warning system and red cross activities
etc)
- Resources (Fishing, agriculture, forestry, tourism etc)- Mode of communication- Major Occupation- NGOs
Optional Information comprises of
- Infrastructure (Market, electricity etc.)- Drinking water & Sanitation (no of tube well, sanitary latrine etc)- Demography (Population, households, no households, households size etc)- Development opportunities
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Based on the nature of information content the main fields are categorized in the following way
(Table 3.1):
Information Quantitative Qualitative Informative
Administrative Identity
Location (GPS reading)
Safety
Major occupation
Major communication
NGOs
Resources
Education
Infrastructure
Drinking water & sanitation
Demography
Table 3.1: Information Categorization
The whole coastal area has been divided into 4 regions to conduct the field visits. The islands and
chars in the Sundarban forest areas were excluded from the field survey plan as in the previous efforts
already a short field trip was conducted. Furthermore, the forest map of 2001 is available with plenty
of information about the area.
Data Collection from ICZMP Technical Note
Data has been extracted from the digital document prepared by PDO-ICZMPP using a customized
program in Visual Basic which can convert the text information into compatible format for MS
Excel or Access. The detail of the program has been given in the user manual.
Converted information was cross checked and viewed in the GIS software. Initially geographical
coordinates of islands and chars given in the report were used to locate the islands. The islands and
chars those have no information of geographical coordinate were identified and located with the
information of administrative name and location. The location of the islands were checked with the
secondary information and by field visits. Islands and chars those were not in the report or have no
location information were identified with information from secondary sources and/or field
information.
Data extracted from Satellite Images
The satellite images were used for identifying the islands, setting criteria for differentiating the
boundary of estuarine/marine and riverine zones, classifying islands and chars, defining the area of
the island and char. Other then this, images were used for land classification by separating Land,
water and mud flat and corresponding areas.
Data extraction from Settlement, Union, and Mauza databases
It has been seen that the name of some of the islands and chars are same as the name of Mauza or
Union. Thus the accuracy of the location of islands and chars is ensured up to Mauza level. The
location of islands and chars is determined or confirmed by using the Union and/or Mauza
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boundaries. In the ICZMP paper 06 there are some of the islands and chars which have information on
administrative identity but have no latitude and longitude. The location of the Island and chars was
confirmed by using the Union and/or Mauza boundaries along with the description of the
administrative location of Island/Chars.
3.2.3
Identification of islands and chars
The images were used as a base layer for identification of the islands and chars. On top of the image
the layer containing islands and chars already located in ICZMP TN Paper 06, the GPS points
collected from the field survey, FINMAPs, SoB Topo maps and forest maps, settlement and
union/mauza layers were used. The location of an island and/or char were only was finalized when
two or more sources agreed about the location of the island and char in question. Source code for each
of the Islands was introduced in the database so that one can understand which and how many sources
has shown consensus about the location of the Island and char. The list of the sources with their
corresponding codes are given in the table 3.2.
Table 3.2: List of sources and corresponding codes
3.2.4 Classification of islands and chars
Different available studies were studied for developing criterion based on which the classification of
island and char would have to be done. A study on chars was carried out by the Irrigation Support
Project for Asia and the Near East (ISPAN) under the Flood Action Plan. The Riverine Chars in
Bangladesh, EGIS, 2000 is the published book based on the findings of that study as well as on
additional analysis carried out on river and char dynamics, particularly for the Jamuna River. The
ISPAN study looked into two different kinds of chars:island charsandattached chars. Island chars
were defined by the study as land that, even in dry season, can be reached from the mainland only by
crossing a main channel. Attached chars are accessible from the mainland without crossing a main
channel during dry season.
According to the PDO-ICZMP study on Inventory of Coastal and Estuarine Islands & Chars the
classification of Island and Char has been done as Marine & Estuarine Islands; Detached riverine
chars; and Chars attached with mainland.
As per Banglapedia (Asiatic Society of Bangladesh), Char defined as a tract of land surrounded by the
waters of an ocean, sea, lake, or stream. In the dynamics of erosion and accretion in the rivers of
Bangladesh, the sand bars emerging as islands within the river channel (island chars) or as attached
land to the riverbanks (attached chars). A distinction was made between island chars, which are
Source code Source Name1 Finnmap
2 LandSat
3 Mauza Database
4 Hazard map
5 SoB Topo Sheet
6 Field
7 ICZMP TN Paper 06
8 Settlement Database
9 Forest Map
99 CDSP
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surrounded by water year-round and attached chars, which are connected to the mainland under
normal flow.
The following are operational criteria for defining the islands and chars:
Cluster Islands should be treated as single island keeping all information of individual islandsalong with.
Islands and chars which are possible to understand from satellite imagery to be attached to themainland or to a main island may be actually separated by a channel or river.
The classification of chars should be maintained as detached and attached. Islands and chars which is always surround by water should not be treated as attached or
detached
There should be two major groups of Chars and Islands: Riverine and Estuarine/marine. Islands must be surrounded by sea.
Lands that are within river should be treated as char. Chars and islands which are at present detached/attached may not be in the same state in the
future due to dynamic in nature of the formation of chars and islands.
The classification of Riverine chars done in different previous studies could be considered forclassifying estuarine/marine chars.
Accessibility, land fertility, infrastructure, development, agriculture, fisheries etc. should beconsidered to classify the islands.
Char which is a part of the mainland or attached to mainland (i.e. not separated by river/khal)should be excluded.
Considering the above points an Island is defined as a piece of land in the marine and estuarineregion, which is completely surrounded by water during low tide in dry season. And char is defined as
a small piece of land similar to Island but located in or adjacent to the river either attached or
detached.
Considering the above criterion, an operational classification has been proposed as follows
(Table3.3):
Code Description
1 Detached riverine char
2 Chars attached with mainland
3 Marine & Estuarine Islands
Table 3.3: Island/char class table
Detached char is considered as land that, even in dry season, can be accessible from the mainland only
through a main channel of the river. Attached chars are accessible from the mainland separated by a
minor channel during dry season.
To delineate the boundary between Riverine and Marine and Estuarine the extent of the tidal effect
has been considered. In the Meghna Estuary Study (MES) the region excluding the area at and around
the Sundarbans has been divided into 3 different regions: The area with variation in tidal range of
about 3 to 6 m (Macro-tidal), the area with tidal range of 2 to 4m (Meso-tidal) and the area with tidalrange less than 2m (Micro-tidal) (Figure 3.2). The boundary between the areas of the Meso-tidal and
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micro-tidal has been considered as the demarcating line of the Riverine and Marine and Estuarine
region. The line has been extended to the further west of the MES area following the landline of the
Sundarbans inclusively.
Figure 3.2: Deferent tide level in Meghna Estuary. (Source: Hydro-morphological dynamics of the
Meghna Estuary, MESII, July 2001)
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While applying the classification criteria, conflict has been arisen in defining some islands and chars
which are having different names but are very difficult to separate from each other. These clustered
islands and chars are attached together but detached as a group (Figure 3.3). The cluster name is
assigned based on the administrative unit which covers most of the area of the islands; as for instance
Thana, Union or Mauza. The islands and chars have been grouped by assigning same names and IDs
of the islands and chars which are in the same group. Therefore information can be used in bothgrouped and ungrouped condition.
Figure 3.3: Cluster Island
3.3 OutputsExisting information combined with information collected from the field survey are presented here.
Existing data has been updated and new data has been added with the table. Not all the islands and
chars are visited as decided in the task planning meeting. But all the possible islands and chars
identifiable by the used sources are identified. Therefore the number of islands and chars identified is
more than the number of islands and chars of which information has been collected.
Existing information and information collected from the field surveys are kept under the following
field names (Table 3.4):
Hatia Island
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Sl No Field Name Description
1 ID Number by which the table can be linked with the island and char location
2 Name Name of the island and char
3 District The name of the district where the island and char is situated. This fieldhas been generated by spatial joining with the Mauza Map.
4 Class Code Island and Char Class Code
5 GroupID Applicable only those islands and Char which are grouped
6 Group Name Applicable only those islands and Char which are grouped
7Thana The name of the Upazila/Thana where the island and char is situated. This
field has been generated by spatial joining with the Mauza Map.
8Union The name of the Union where the island and char is situated. This field has
been generated by spatial joining with the Mauza Map.
9Mauza The name of the Mauza where the island and char is situated. This field
has been generated by spatial joining with the Mauza Map.
10Administrative
Identity
The administrative units by which the island can be defined. Sometimes it
also contains the history and some present aspect of the island and char
11Location Geographical location of the island and char with surrounding island and
char
12Latitude Latitude in global coordinate. This field has been generated from ArcView
GIS.
13Longitude Latitude in global coordinate. This field has been generated from ArcView
GIS.
14 Area Area of the island and char as collected from previous studies
15Calculated Area Area of the island and char composed of forest and land calculated from
Satellite Image of 2005
16 Forest Area Forest area of the island and char calculated from Satellite Image of 2005
17
Land Area Land area of Island and Char composed of settlement, potential
agricultural land, fellow land and Uri grass calculated from Satellite Image
of 2005
18Safety Information about the vulnerability against cyclone, bank erosion etc. and
protective measure
19 Cyclone Shelter No of Cyclone Shelters or Killas
20
Population Total population, number of male and female of the island and char.
Population information collected from field surveys is not the exact
numbers.
21
Household Information about number of households, Average household size,
dwelling type etc. Household information collected from field surveys are
not the exact numbers.
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Sl No Field Name Description
22 Resources General resource information
23Agriculture Information about agricultural resources such as: amount of cultivable
land, crop type, household involved etc.
24Fisheries Information about type of fishing, amount of fishing, fishing source,
household involved etc.
25 Forest Information about type of forest, forest land area etc.
26 Livestock Information about number of different category livestock
27 Occupation Information about main occupation and population involved
28 Education Information about literacy rate, number educational institutions.
29 Communication Information about means of communication
30 OtherInfrastructures
Number/amount of other infrastructures
31Drinking Water
& Sanitation
Availability of drinking and sanitation facilities
32 NGOs Name of the NGO's working in the island and char
33Development
Opportunities
Information about potential development opportunities
34Other
Information
Information not covered in the stated fields
35Problem &
Constraints
Different problems and constraints
36Source/Referenc
e Books
References and sources of information
Table 3.4: Bundle information of the table
All tabular records (each island and char has single record) can be linked with the island and char
location by joining common fields named Link_id in the tabular record and ID in ArcView table.
Identified island and char has been stored in GIS format. Each island and char is shown as a point.The format of the table has been designed in such a way that one can categorize the island and char on
the basis of source used and island and char class. The list of the field names and its description is
given in the following table (Table 3.5):
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Field Name Description
Id Unique Identification number same as Link_id of the access table
Name Name of the island/char
District The name of the district where the island/char is situated
Thana The name of the Upazila/Thana where the island/char is situated
Union The name of the Union where the island/char is situated
Mauza The name of the Mauza where the island/char is situated
Src_Code Unique code against each source
Cls_Code Island/char class code
Gr_Id Island/char id after being grouped
Gr_Name Island/char name after being groupedX_Coord Geo-referenced Coordinate
Y_Coord Geo-referenced Coordinate
Latitude Geographic coordinate
Longitude Geographic coordinate
Geocode Geocode for mauza
Area Area (in Sq. Km.) of the island and char composed of forest and land
calculated from Satellite Image of 2005
Mangrove Forest area (in Sq. Km.) of the island and char calculated from Satellite
Image of 2005
Land_Area Land area (in Sq. Km.) of Island and Char composed of settlement,
potential agricultural land, fellow land and Uri grass calculated from
Satellite Image of 2005
Cyclone_Sh Number of cyclone shelters
Table 3.5: List of the field names and its description
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A total of 185 individual islands and chars were identified of which information of 144 islands and
chars were collected. During the identification of islands and chars the selection criteria has been tried
to follow but sometimes the demarcation seems to be not so clear. In these cases care was taken about
not losing the island and char itself and/or information of any island and char.The islands and chars
are classified into the above mentioned classes. The number of islands and chars in each of the classes
are shown in the table (Table 3.6) given below:
Code Description Number of Islands/Chars
1 Detached riverine char 21
2 Chars attached with mainland 92
3 Marine & Estuarine Islands 72
Table 3.6: Number of islands in each class
The final list of the updated information and the ArcView table have been given as Annexes (Annex
II & Annex III respectively) at the end of the report.
District wise summary of Marine & Estuarine Islands is presented in the following table (Table 3.7).
Table 3.7: District wise summary of Marine & Estuarine Islands
Sl
NoDistrict
Number
of
Islands
Island
Area
Sq km
Island
Area in
% of the
District
Area
District-
wise Island
Population
% of
District
Population
living in
Islands
No of
Households
in Islands
No of
Unprotected
Islands (By
Embankment
or Polder)
No of Protected
Islands (By
Embankment
or Polder)
No of
Cyclone
Shelters
No of
Cyclone
Shelters
per 10,000
Population
1 Bagerhat 6 264 7 16,760 1 767 6 0 0 0
2 Barguna 3 3 0 0 0 0 3 0 0 0
3 Bhola 18 1,587 79 1,587,248 93 265,044 15 3 65 0
4 Chittagong 4 413 10 326,499 5 57,934 2 2 144 4
5 Cox'S Bazar 4 393 19 363,280 21 63,660 2 2 112 3
6 Khulna 2 27 1 0 0 0 2 0 0 07 Lakshmipur 3 65 5 44,680 3 5,929 2 1 1 0
8 Noakhali 8 497 19 420,060 16 68,327 7 1 244 6
9 Patuakhali 20 895 36 311,284 21 58,210 15 5 137 4
10 Pirojpur 2 3 0 0 0 448 2 0 0 3
11 Satkhira 2 102 3 0 0 0 2 0 0 0
Total 72 4,248 15 3,069,811 13 520,319 58 14 703 2
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A summary table (Table 3.8) of the Marine & Estuarine Islands is given below.
Table 3.8: Island summary table.
Sl.
NoName District
Area
Sq.Km
Forest
Area
sqkm
Land
Area
Sqkm
No. of
Population
No.of
Household
Pretection (By
Embankment
or Polder)
No. of
Cyclone
Shelter
1 Andar Char/ Prasann Patuakhali 8.86 0.30 8.56 3000 250 Unprotected 1
2 Bara Baisdia Patuakhali 67.05 8.47 58.58 17186 2813 Protected 9
3 Batmara Khulna 24.19 20.15 4.04 0 Unprotected 0
4 Bhasan Char Chittagong 14.03 0.00 14.03 18559 3534 Unprotected 0
5 Bhola Bhola 1297.04 4.24 1292.80 1476328 246354 Protected 40
6 Bhola Char Barguna 0.82 0.50 0.32 0 0 Unprotected 0
7 Bodnar Char Bhola 15.31 7.81 7.50 0 0 Unprotected 0
8 Chalita Bunia Patuakhali 30.63 8.36 22.27 3120 530 Unprotected 5
9 Chandnandi Noakhali 40.81 2.24 38.57 0 0 Unprotected 0
10 Char Abdullah Lakshmipur 1.20 0.00 1.20 0 0 Unprotected
11 Char Basonbhanga Bhola 9.24 4.64 4.60 0 0 Unprotected 0
12 Char Basson Bhola 8.26 4.87 3.39 0 0 Unprotected 0
13 Char Dhal Bhola 18.30 9.42 8.88 10000 700 Unprotected 0
14 Char Gajaria Lakshmipur 63.58 11.91 51.67 30000 1309 Unprotected 0
15 Char Gazi Lakshmipur 14680 2549 Protected 1
16 Char Gazipura Bhola 2.52 0.00 2.52 0 0 Unprotected 0
17 Char Gulishakhali Barguna 1.54 0.00 1.54 0 0 Unprotected 0
18 Char Hadi Patuakhali 29.55 9.73 19.82 600 100 Unprotected 1
19 Char Halim Patuakhali 18.76 0.00 18.76 535 107 Unprotected 0
20 Char Hare Patuakhali 5.49 1.98 3.51 124 12 Unprotected 0
21 Char Hassan Bhola 1.58 0.58 1.00 500 80 Unprotected 022 Char Islam Patuakhali 17.98 14.76 3.22 0 0 Unprotected 0
23 Char Jonak Noakhali 8.26 6.79 1.47 0 0 Unprotected 0
24 Char Kajal Patuakhali 168.02 8.24 1 59.78 31498 5000 Protected 12
25 Char Kasem Patuakhali 6.81 4.73 2.08 70 36 Unprotected 0
26 Char Krishnaprasad Bhola 3.53 1.41 2.12 2000 300 Unprotected 0
27 Char Kukri Mukri Bhola 48.90 23.49 25.41 21000 2500 Protected 0
28 Char Macher Patuakhali 0.72 0.00 0.72 0 0 Unprotected 0
29 Char Montaz Patuakhali 75.99 9.78 66.21 25000 6000 Protected 4
30 Char Nizam Bhola 3.42 1.26 2.16 3500 700 Unprotected 0
31 Char Nurul Islam Noakhali 0.48 0.40 0.08 0 0 Unprotected 0
32 Char Padma Bhola 12.59 0.00 12.59 2400 300 Unprotected 0
33 Char Pial Bhola 3.87 2.58 1.29 0 0 Unprotected 0
34 Char Shabaz Bhola 10.32 1.03 9.29 0 0 Unprotected 0
35 Char Tajul Islam Bhola 17.22 10.45 6.77 0 0 Unprotected 0
36 Char Tapashi Patuakhali 5.25 4.98 0.27 0 0 Unprotected 0
37 Char Tufania Patuakhali 1.37 0.44 0.93 30 2 Unprotected 0
38 Char Zahiruddin Bhola 10.96 4.66 6.30 7920 1550 Unprotected 339 Chhota Banglar Char Patuakhali 1.17 1.02 0.15 0 0 Unprotected 0
40 Dakshin Char Tapasi Patuakhali 2.12 1.21 0.91 0 0 Unprotected 0
41 Damar Char Noakhali 6.05 1.13 4.92 0 0 Unprotected 0
42 Dhal Char Noakhali 42.93 11.64 31.29 60 7 Unprotected 0
43 Dimer Char Bagerhat 2.60 1.46 1.14 0 0 Unprotected 0
44 Dubla Island Bagerhat 68.11 64.09 4.02 16400 700 Unprotected 0
45 Golkhali Patuakhali 0.76 0.70 0.06 0 0 Unprotected 0
46 Haldeburia Satkhira 72.90 71.79 1.11 0 0 Unprotected 0
47 Hatia Noakhali 355.12 24.91 330.21 400000 67820 Protected 237
48 Jahajjir Char Chittagong 78.85 18.51 60.34 0 0 Unprotected 3
49 Kachubaria Char Barguna 0.65 0.24 0.41 0 0 Unprotected 0
50 Kala Para Patuakhali 297.28 7.00 290.28 174921 31324 Protected 82
51 Kotkar Khot Bagerhat 23.25 20.35 2.90 60 12 Unprotected 0
52 Kutubdia Cox'S Bazar 69.43 0.00 69.43 106280 18360 Protected 82
53 Latar Char Bhola 6.99 3 .22 3.77 0 0 Unprotected 0
54 Majer Char Pirojpur 0.28 0.07 0.21 0 0 Unprotected
55 Majher Char Pirojpur 2.82 0.00 2.82 0 0 Unprotected 0
56 Mandarbaria Satkhira 29.19 28.33 0.86 0 0 Unprotected 0
57 Manpura Bhola 115.33 17.29 98.04 63600 12560 Protected 22
58 Moheskhali Cox'S Bazar 298.74 18.74 280.00 247000 43400 Protected 28
59 Narikel Baria Bagerhat 158.57 150.34 8.23 300 55 Unprotected 0
60 Nijhum Dwip Noakhali 39.68 16.88 22.80 20000 500 Unprotected 7
61 Pakhhir Char Bagerhat 2.96 0.43 2.53 0 0 Unprotected 0
62 Pater Char Bhola 1.17 0 .00 1.17 0 0 Unprotected 0
63 Putney Island Khulna 2.80 2.73 0.07 0 0 Unprotected 0
64 Rangabali Patuakhali 136.88 22.97 1 13.91 55000 12000 Protected 23
65 Rupar Char Patuakhali 0.70 0.16 0.54 0 0 Unprotected 0
66 Saint Martin Cox'S Bazar 4.02 0.00 4.02 6500 1200 Unprotected 2
67 Sandwip Chittagong 224.41 4.94 219.47 292940 50900 Protected 134
68 Shahebaner Char Noakhali 4.12 4.03 0.09 0 0 Unprotected 0
69 Sonadia Cox'S Bazar 20.82 2.26 18.56 3500 700 Unprotected 0
70 Sonar Char Patuakhali 19.31 15.82 3.49 200 36 Unprotected 0
71 Tear Char Bagerhat 8.20 6.99 1.21 0 0 Unprotected 0
72 Urir Char Chittagong 95.74 12.00 83.74 15000 3500 Protected 7
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Chapter 4
Information System
4.1 ObjectivesThe overall objective of the Coastal Island and Char Information System (CIIS) is to facilitate the
planner, and other users who are involved in the process of development of Integrated Coastal Zone
Management Plan of Bangladesh through investigating the condition of the coastal islands and chars.
It has designed to support the management of decisions, to aide in the analysis and evaluation of
existing conditions and to assist in decision support. This ability of quickly and thoroughly analysing
any aspects of islands is invaluable in the constant attempt to increase the socio-economical and
ecological condition of the coast.
CIIS is a structured way of storing, accessing as well as organizing information in order to increase
the efficiency and effectiveness of the integrated planning process as operational tool for following
functions:
- Planning- Implementation
This system associated with database has been made simple and open in order to accelerate the
accessibility to information. The CIIS can be distributed or replicated for different users. This is a
simple system to use that does not require any map handling capability. People from managers to
general users can use this system.
4.2 Directory structureThe directory structure of the CIIS is following:
Let CIIS root directory isROOT_DIR = C:\Island, The rest of the directory is relative to this root
directory.
The main executable file:ROOT_DIR\ Island.exe
Island information data file: ROOT_DIR\ Island.mdb
An installer is prepared for CIIS installation. There are two main installation file a) Main setup exefile b) cab file: contain the all installation file. Click on the setup file, a destination directory will be
asked. Enter a destination directory name for example: C:\Island.
4.3 Working with Application4.3.1 CIIS organization
CIIS has following interfaces:
a) Introductionb) Map Viewer
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Introduction
The introduction is for giving a preface of the CIIS. It is the gateway to the main interface named as
Map Viewer. (Figure 5.1)
Figure 5.1: Introduction Page
Map viewer
The Map Viewer (Figure 5.2) is developed to facilitate user to view, search, classify and print the data
as well as map. Map viewer has a map view area where an user can view, search, print, setting labels.
Maps stored in users computer in digital format. Map viewer support different GIS file format suchas ESRI shape file, NT coverage, Grid, Images file format etc. One can add or remove layers in the
map viewer.
Figure 5.2: The main page of the CIIS
The page can be divided into 2 sections. The section at the left shows the Island and Char information
extracted from the database. The information has been kept according to the 19 districts of the coastalIslands. By selecting a district one can see the list of the Islands and chars located in that district. The
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map viewer will show the map of the selected district and will respond instantly with any change. An
Island and Char will be highlighted and located in the middle of the map viewer pan when it is
selected. The scale will appear at the left bottom corner of the window.
The toolbar is in the right side of the map viewer pan. The toolbar consists of 9 different useful tools.
(Figure 5.3)
Figure 5.3: Tools in the toolbar
Zoom In, Zoom Out
To Zoom in, click on Zoom In icon from tool bar. The mouse icon will be changed to glass icon.
Now click on map area and draw a rectangle, map will be zoom in to this extent of the rectangle area.
To zoom out click on Zoom Out icon from the toolbar now click on the map view area, the map will
be zoomed out in certain extent.
Pan
Some times displayed Maps are zoom in such a level that viewing maps are bigger then map area. To
display the hidden part of the map user has to move the map in desired direction this is called pan. To
pan a map, click on Pan icon from toolbar the mouse icon will be changed to hand icon. Click on
map view area and drag the map in desired direction, the whole map will be moved in that direction.
Full extent
The maps may be displayed in any zoom level. Display map to its maximum extent of the layer is
called full extent. To full extent of the map, click on full extent icon from toolbar. The map will be
displayed in full extents.
Map Tips
To show data in the map as a tip Map tips is developed. Island and Char name is set to display in
the map. Moving mouse on the map in map view area, Island and Char name will be displayed.
Labeler
To label the map one of the data layers that is District or Island and Char will be selected from the
drop down list. Then by clicking on Labeler icon from toolbar the map can be labeled. Added
labels can be removed by clicking on the Remove Labelbutton.
Zoom In
Zoom Out
Identifier
Labeler
Full Extent
Pointer
Find
Add TextPan
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Find
This tool is for searching an Island and Char by its name. Upon clicking on Findicon an window
will appear allowing the user to enter their desired Island and Char. To put the name of the Island and
Char the sentence case format i.e., Putney Island has to be followed (Figure 5.4).
Figure 5.4: Find Result
Searched Island and Char, if exists, will appear in the middle of the map viewer pan and will be
highlighted.
Add Text
Besides the labeler tool there is another tool in the toolbar by which one can add any type of text. Thetext can be added in any places chosen by the user by clicking on the map viewer with the Add Test
toolbar. Added texts can be removed by clicking on the Clear Textbutton.
Pointer
To switch within the toolbars a pointer can be used which will change the icon to an arrow.
Attribute data
The characteristic of a geographic feature (spatial data) described by numbers or characters, typically
stored in tabular format, and linked to the feature. For example attributes of an Island and Char
contains Island Name, District, Upazila/ Thana, Union, Mauza, Administrative Identity, Safety,
Location, Latitude, Longitude, Area (Sq Km), Population, Household, Resources, Agriculture,Fisheries, Forest, Live Stock, Occupation, Education, Communication, Other Infrastructure, Drinking
Water, NGOs, Other Information, Development Opportunities, Problem & Constraints and Source. To
show the attribute data of a spatial data (map), one has to double click on an Island and Char in the
list. The attribute data will be showed in the separate window (Figure 5.5). One can copy any of the
fields or select all the fields to copy. For easy editing the copy items should be pasted in MS Excel.
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Figure 5.5: Attribute Information
Identify Result
Each data layer in map view area has a table, storing attributes about the geographic features it
contains. A data layers attribute table contains one record for each feature in the map view area. The
Identify tool lets user display the attributes of the features on a Map view area by clicking on them
with the mouse. Choose the Identify icon from toolbarand click on any feature in the data layer on
map view area to display its attributes (Figure 5.6). Attributes of the layer located at the mouse points
are displayed.
Figure 5.6: Identify Result
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4.3.2 Copy and Export Map
The whole map or any of the parts of the map with any added information can be copied in the
clipboard or can be export as .bmp format for using in the report of any other printing purpose.
4.3.3 Labeling and classifying facilities
By double clicking on the layer appeared on the add panel one can change the shape, size and colour
of the symbol. The layers can be arranged by dragging up and down. One can classy the islands on the
basis of the attribute fields like inland class or sources used to identify and locate the islands. The
facilities are given in different panels (Figure 5.7), which are:
Single: for displaying all the features in a layer with the same symbol
Unique: For displaying features by applying a symbol to each unique value to a specified field
Classes: For applying different symbols to a set of discrete values
Labels: For drawing text for a specified field
Figure 5.7: Symbol Properties
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Chapter 5
Conclusions
For this study an operational criteria based on different tidal levels stated in the report of the MeghnaEstuary Study was used. It was not possible to find out any established criteria to demarcate the
estuarine, marine and riverine zones. This criteria can be applied only for the Meghna estuary study
area and for the rest of the coastal area the landline has been followed.
The classification of islands and chars has been done on the basis of physical separation of islands and
chars from the mainland. It is difficult to come up with a figure which exactly indicates the number of
total islands or chars in coastal zone of Bangladesh.
There are significant number of already developed areas in the coastal zone which contain, in most
cases, the word char with its name. This is due to their previous location as char or island. Although
these areas are fully attached to the main land, the physical, socio-economical, environmental
condition and infrastructure developments of these areas are rather similar to chars condition. In theplanning process these areas are considered in different way in comparison to other mainlands and
therefore needs to be located as chars. These categories mostly were grouped in the Chars attached
with mainland classes.
IRS-P6 LISS III image of 2005 is the most recent among the sources used in this study. Therefore this
inventory could be considered as the latest inventory of the islands and chars of the coastal area. There
is less possibility of occurrence of inclusion and exclusion of the island and chars. All the possible
islands and chars exists in the satellite images and in the reports have been attempted to identify.
Further it would be possible to accommodate any newly developed criteria for identifying and
classifying the islands and chars in this inventory.
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References
http://www.bangladeshgov.org/mod/sob/sobweb.htm
Hydro-morphological dynamics of the Meghna Estuary, MESII, July 2001
Inventory report on char lands in southwest coastal region of Bangladesh, CDP
Map Object Technical Guide
NWRD technical Notes and Metadata
PDO-ICZMP paper no. 06: Inventory of Coastal and Estuarine Islands & Chars
Sundarbans Reserved Forests, Department of Forestry, 1995