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How to use IDRISI Selva(An introduction)

Ronald C. Estoque, D3Division of Spatial Information Science

Graduate School of Life and Environmental Sciences

University of Tsukuba, Japan

GIS Seminar/University of Tsukuba, Japan/September 13, 2012

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Presentation outline

1. Background about IDRISI Selva

2. Data format, display and map composition

3. IDRISI Selva Modules4. A closer look at some modules

5. Remarks

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1. Background about IDRISI Selva The IDRISI Legacy

was named after Abu Abd Allah Muhammed al-Idrisi(1100-1166 A.D.)

a cartographer and geographer of major significance during themedieval period.

IDRISI Selva

a version 17 of IDRISI; Selvameans dense tropical forest

an integrated raster-based GIS and Image Processingsoftware

provides nearly 300 modules

for the analysis and display of digital spatial information

a complete GIS analysis package

for basic and advanced spatial analysis

surface and statistical analysis, decision support, and change and timeseries analysis

3Source: http://www.clarklabs.org

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1. Background about IDRISI Selva

IDRISI Selva

provides a platform for integrated modeling

environments

Earth Trends Modeler

for image time series of environmental trends Land Change Modeler

for land change analysis and prediction, a critical component

for REDD projects

provides complete utilities for: importing and exporting GIS data

a comprehensive set of documentation and tutorials

4Source: http://www.clarklabs.org

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2.a. Data format Raster file - *.rst

Vector file - *.vct

Conversion: ArcGIS format IDRISI format

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ArcGIS shapefile IDRISI vector file

Import directly into IDRISI

ArcGIS grid file IDRISI raster file Convert the grid file into an ASCII file (text file)

Done in ArcGIS

Import the ASCII file into IDRISI

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2.a. Data format Conversion: ArcGIS format IDRISI format

ArcGIS grid file IDRISI raster file

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2.a. Data format Conversion: ArcGIS format IDRISI format

ArcGIS shapefile IDRISI vector file

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2.a. Data format

Note: When using ArcGIS 10

no need to convert IDRISI raster file into ArcGIS grid file

ArcGIS 10 is able to read and process IDRISI raster file

IDRISI vector file ArcGIS shapefile

reverse the process presented in the previous slide

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2.b. Data display

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Right

click

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2.b. Data display

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Right click on the legend


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2.c. Map composition

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Automatically

opens when

displaying

data


To add layer

To examine

layer properties

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2.c. Map composition

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3. IDRISI Selva Modules

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3. IDRISI Selva Modules

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4. Decision Wizard: A closer lookExample:

Hypothetical goal Find suitable sites for housing projects

Factors distance to city center; distance to road; and slope (no constraints)

Relative weights to be determined using Analytic Hierarchy Process (AHP)

Assumption: the area is not yet urbanized and large part of it is still available for housing and urban

development.

Modules: Decision wizard [Multi-criteria Evaluation (MCE), Fuzzy, Weight, AHP] and Reclass

15Distance to city center (m) Distance to road (m) Slope (degrees)

Factors

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4. Decision Wizard: A closer look

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2

3

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4. Decision Wizard: A closer lookStandardization procedures:

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Standardized factors

Distance to city center Distance to road Slope

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b

center

road

slope

center road slope

ac

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If AHP weights are not yet determined,

perform steps a-c

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8_contd 10

Output

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Weighted Linear Combination

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MCE procedure/aggregation method

Weighted Linear Combination (WLC)

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iixwLSI

where:

LSI land suitability index

wi

weight of factorix

i standardized value of factori

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11 (optional)

OR

Outside

the

wizard

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Suitability

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IDRISI Selva has a lot of modules ample time is needed to explore these modules (prioritize what is needed)

Nevertheless, the software comes with very useful tutorials. If interested, try some of the exercises

5. Remarks

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Documents

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