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TRANSCRIPT
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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
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 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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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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4. Decision Wizard: A closer look
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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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4. Decision Wizard: A closer look
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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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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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