How to use IDRISI Selva
Transcript of How to use IDRISI Selva
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How to use IDRISI Selva (An introduction)
Ronald C. Estoque, D3 Division 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 Modules
4. 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 the
medieval period.
• IDRISI Selva – a version 17 of IDRISI; Selva means ‘dense tropical forest’
– an integrated raster-based GIS and Image Processing software • 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 time series analysis
3 Source: 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
4 Source: 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
Right click on the legend
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2.c. Map composition
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Automatically opens when displaying data
Right click on the legend
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 look Example:
• 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
15 Distance 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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4. Decision Wizard: A closer look Standardization procedures:
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Standardized factors
Distance to city center Distance to road Slope
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4. Decision Wizard: A closer look
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b
center road slope
center road slope
a
c
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If AHP weights are not yet determined,
perform steps a-c
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4. Decision Wizard: A closer look
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8_cont’d 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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ii xwLSI
where:
LSI – land suitability index
wi – weight of factor i
xi – standardized value of factor i
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4. Decision Wizard: A closer look
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11 (optional)
OR Outside
the wizard
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4. Decision Wizard: A closer look
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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