Water Observation and Information System - Nile-Eco · PDF fileWOIS Training, Spiez, September 2015 QGIS 2.8.1 QGIS is a powerful and user friendly Open Source Geographic Information

WOIS Training, Spiez, September 2015

Water Observation and Information System

Introduction to WOIS and main outcomes


WOIS - Water Observation and Information System

Powerful Geographic Information System (GIS) tool for water resource management

Facilitates utilization of remotely sensed Earth Observation (EO) data

Simple Graphical User Interface (GUI) Ease of use for non-experts


WOIS - Water Observation and Information System Dedicated software (=platform) for dedicated tasks

Diversity of EO processing and GIS tools provided within a single GUI Open source

Free distribution Easy to modify/extend


WOIS 3.0 Upgrade from QGIS 2.2 to 2.8. Version 2.8 of QGIS has been designated as Long Term Release, meaning that regular bug-fix updates will be produced for a period of a year thus ensuring the stability and compatibility of the software Upgrade from NEST 5.1 to S-1 Toolbox 1.1.0. This is a major update of NEST and a change of software name. The main upgrade was the addition of functionality for reading and processing of Sentinel-1 (S-1) satellite radar data Improvement of semi-automatic installation utility Continued promotion of GitHub (https://github.com/) for hosting the WOIS source code and as a version control system for keeping track of the development of WOIS and for handling bug reports Multiple workflows and tools improvement (e.g. flood mapping or small water body mapping) have been updated to make use of S-1 data


QGIS 2.8.1

QGIS is a powerful and user friendly Open Source Geographic Information System (GIS)

QGIS provides capabilities for data viewing, editing, analysis and presentation

Main GUI for WOIS functionality

Extensive geoprocessing toolbox +300 algoritms for for both raster and vector

Intergrates QGIS, SAGA GIS, GRASS, Python, GDAL/OGR, Orfeo Toolbox and more …

Drag and drop modeler and Python scripting


QGIS plugins & tools Temporal/Spectral profile tool

Interactive visualization of time-series data

Point sampling tool Collect raster values from multiple layers at specified sampling points

Calculate summary statistics (continuous rasters)

Report land cover statistics (thematic rasters)


GRASS GIS 6.4.3

Geographic Resources Analysis Support System, commonly referred to as GRASS-GIS extends QGIS with additional tools for image processing and spatial modeling

Long history and strong development community

Example algorithms: Raster calculator

Missing value interpolation

Temporal and spatial aggregate operations

Image statistics

Watershed analysis

Vector to raster and raster to vector conversions


Orfeo Toolbox (OTB) 4.2.1

Offers functionalities for remote sensing image processing in general and for high spatial resolution images in particular

Targeted algorithms for high resolution optical images (SPOT, Quickbird, Worldview, Landsat, Ikonos) or SAR (TerraSarX, ERS, Palsar) are available

Example algorithms: Image classification: supervised and unspervised

Radiometric vegetation indices calculation

Image segmentation

Raster calculator


BEAM 5.0

Basic ERS & Envisat (A)ATSR and Meris Toolbox (BEAM)

Open source toolbox for the utilization, viewing and processing of Envisat (and other) remotely sensed data

Envisat image subsetting, reprojecting and format conversion

Water quality and temperature modelling

Band math, classification, etc.


Sentinel – 1 Toolbox 1.1.0

Open source toolbox for reading, pre-processing and analysing data from ESA SAR missions including ERS-1 & 2, Envisat and Sentinel-1

Built on top of NEST

Example algorithms: Terrain correction

Calibration and conversion to dB

Speckle filtering

Subsetting, reprojecting


SWAT/MapWindow

SWAT is a public domain integrated hydrological model that simulates the complete terrestrial water cycle

Flexible in terms of applications and scale

MAPWINDOW GUI-based interface to set up a new SWAT model or modify an existing SWAT model

Pre-processing of model input data, executing the model and post-processing of model results are implemented through QGIS


R / Python scripts Custom created R and Python scripts

R provides a wide variety of statistical (linear and nonlinear modelling, classical statistical tests, time-series analysis, classification, clustering, ...) and graphical techniques, and is highly extensible

Python scripts use algorithms included in Processing Toolbox to automatize/extend functionality (e.g. time-series processing)


WOIS Toolbox – workflow library 55 Workflows Providing step-by-step guidance for the processing of products and other relevant EO processing/GIS tasks through simplified common tasks

with seamlessly combined WOIS components


DESIGN STRENGHTS The diversity of EO processing and GIS tools provided within a single GUI is unique

The ability to sequentially combine algorithms from different providers into workflows is unprecedented

Extensive reporting functionality (e.g. map publishing, time series tool, zonal statistics)

One stop resource for integrated EO processing and GIS analysis

Under TIGER-NET developed, tested and validated for a number of product prototypes


The Platform

Potential to function as a general repository and access platform for EO data processing and training

Facilitating thereby the wider use of EO data in the African community and beyond

Open source


Hosting of code

Git is a command-line tool for local revision control allowing a number of contributors to work on the same project, while keeping track of the changes and managing the source code (and other files)

Contribute bug fixes/features Report issues and discuss with other users User guide in the installation package

GitHub: github.com/tiger-net


Installation wizard

Starts individual component installers

Takes care of post-installation tasks File copying

Plugin activation

Important:

Run as administrator (right click)

Choose correct installation (32 or 64 bit)


WOIS water information products Water quality monitoring (lake surface temperature, chlorophyll and sediment load)

High to medium land cover, change and degradation mapping (incl. vegetation indices)

Water body mapping (small/large, shoreline changes, wetlands)

Flood forecasting, monitoring, historical and vulnerability assessment

Hydrological monitoring (precipitation, evapotranspiration, soil moisture, water level)

Hydrological modelling (scenario analysis and operational forecasting)

Erosion potential mapping

Urban sanitation planning support


Water quality and water surface temperature (PG#01)

Water quality information

Water surface temperature


WOIS 3.0

Multi-date composition

ftp plugin for direct and scheduled download

Water quality and water surface temperature (PG#01)

Water surface temperature


Assessment of land degradation processes (PG#03) Land degradation hot-spots

WOIS 3.0

Option to control for rainfall variability


State and change in land cover/ land use (PG#04/#05)

Land Cover Change Monitoring in km² per class

Seasonal Vegetation Dynamics Analysis


WOIS 3.0

Water demand evaluation and hazard exposure analysis

SPOT VGT import support

Exposure analysis and water demand evaluation (PG#05)


Water bodies mapping (PG#06)

Small Water Body (SWB) mapping

Localization of SWBs

SWB ID XCOORD YCOORD

1 -3.369437 11.990526

2 -3.417772 11.98972

3 -3.416978 11.972579

SWB ID AREA PERIMETER

1 21171.4174 904.002332

2 183454.388 2946.96615

3 294551.767 3484.08552

Area statistics

Class Area [km²]

Decrease of small water bodies 0.49

Constant small water bodies 4.16

Increase of small water bodies 2.93

Seasonal change analysis

Seasonal change 2007

Class Area [km²]

Open water 4077.56

Flooded vegetation -13768.08

Long-term change 2007 - 2008

Class Area [km²]

Open water 4870.10

Flooded vegetation -11605.79

Lake Chad surface extent mapping

WOIS 3.0

Options for both Optical and Sentinel-1/SAR based processing


WOIS 3.0

Options for both Optical and Sentinel-1/SAR based processing

Water bodies mapping (PG#06)


Dynamic Flood Mapping (Sentinel-1, RADARSAT-2)

Historical Flood Mapping (Envisat, ASAR WS)

RADARSAT-2 backscatter Flood map

Lake Tana, Ethiopia Fogera and Dembia floodplains 18th August 2013

Sudan Khartum city surroundings 20th August 2006

Flood monitoring (PG#07)


WOIS 3.0

Support for Sentinel-1 Malawi/Mozambique January 2015

Caprivi floodplain, April 2014

Flood monitoring (PG#07)


Hydrological characterisation (PG#08)

Evapotranspiration

Rainfall

Soil moisture

WOIS 3.0

ftp plugin for direct and scheduled download

New soil moisture retrieval workflow

Water levels


Hydrological modelling (PG#09)

WOIS 3.0

Model and operational development framework


Hydrological modelling (PG#09)


Water supply and sanitation support (PG#10)


WOIS 3.0

New workflow

Roll-out

Water supply and sanitation support (PG#10)


Wetland mapping (PG#12)


Erosion Potential Indicator (PG#12)

Anthropogenic caused soil erosion hotspots

Soil erosion potential

Soil erosion potential class Area (km2)

No soil erosion (water mask) 71,018

Very low soil erosion 161,974

Low soil erosion 6,807

Low to medium soil erosion 1,712

Medium to high soil erosion 1,201

High soil erosion 324

Very high soil erosion 422

Soil erosion monitoring

Documents

Water Observation and Information System - Nile-Eco · PDF fileWOIS Training, Spiez, September 2015 QGIS 2.8.1 QGIS is a powerful and user friendly Open Source Geographic Information