idrisi software manual

7/25/2019 IDRISI Software manual

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TECHNICAL NOTES ON

Prepared ByTechnical Services Division,

ADITIINFOTECH

B-1, 1st Floor, Swapnil Apartment, Abhyankar Road,Dhantoli, NAGPUR440 012TeleFax: +91 (0712) 2427355

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Advanced GIS (Geographic Information System) and Image Processing Software

Description :IDRISI Taiga is an integrated GIS and Image Processing software solution providingnearly 300 modules for the analysis and display of digital spatial information. IDRISIoffers the most extensive set of GIS and Image Processing tools in the industry in asingle, affordable package.

Tools for land planning, decision support, and risk analysis are included side-by-sidewith tools for spatial statistics, surface analysis, and spatial modeling. With IDRISI, allanalytical features come standardthere is no need to buy costly add-ons to extendyour research capabilities.

The Taiga Edition, released in January 2009, is the 16th major release of the IDRISIsoftware since 1987. IDRISI is used by researchers and professionals across industriesin over 175 countries.

IDRISI Modules A - ZA B C D E F G H I LMN O P Q R S T U VWX

Sr No. Name of Modules Functions

1. ALLOCATEAnalysis/Distance Operators

Performs spatial allocation using either DISTANCE or COST

surfaces.

2. ARCIDRISFile/Import-Export/Software-Specific Formats

Converts files to and from Arc/Info GENERATE/UNGEN format.

3. ARCRASTERFile/Import-Export/Software-

Specific Formats

ARCRASTER imports and exports ESRI ArcInfo RasterExchange Format files.

4. AREAAnalysis/Database Query Creates a new image by giving each output pixel the value of thearea of the class to which the input pixel belonged. Output canalso be produced as a table or an attribute values file in a range ofmeasurement units.

5. ASDIDRISIASD-ISC Conversion

This module is used to import the spectrometer data collectedusing the Analytical Spectral Device (ASD) into the IDRISI

Spectral Curve (.isc) file format

6. ASPECTSurface Analysis

SURFACE calculates slope, aspect and shaded relief images from

a continuous surface image, such as a digital elevation model.

7. ASSIGNAnalysis/Database QueryData Entry

Creates an image from an attribute values file by assigning the

data values contained in the attribute values file to the cellsbelonging to defined regions. ASSIGN can also be used to

reclassify integer images.8. BILIDRIS

File/Import/General ConversionTools

Converts generic band-interleaved by line images to IDRISI

format.

9. BIPIDRISFile/Import/General ConversionTools

Converts generic band-interleaved by pixel images to IDRISIformat.

10. CONTOUR CONTOUR is used to create vector contour lines (lines of equalattribute value) from continuous raster surface images.

11. CONVERTReformat

Converts between all of the image storage formats supported byIDRISI. Files may be converted to any combination of the byte,

integer and real (floating point) data types and the ASCII, binary


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and packed (run-length encoded) file structures.

12. FLY THROUGHThe Fly Through module usesGL Scene technology

Fly Through is a 3-D interactive display that allows users tosimulate movement through space using existing IDRISI images.Fly Through allows the recording and playback of flight paths andthe saving of a path to a generic WAV file.

13. GEOMODModel for land use change

simulation

GEOMOD is a landuse change simulation model that predicts thetransition from one landuse state to another landuse state, i.e., the

location of grid cells that change over time from one state toanother.

14. GEOTIFFFile/Import/General Conversion

Tools

GEOTIFF/TIFF imports and exports simple TIFF files as well asGeoTIFF files.

15. MOLAAnalysis/Decision Support

An iterative Multi-Objective Land Allocation routine. Input maps

are ranked suitability maps such as would be produced by ranking(using RANK ) the output from a multi-criteria evaluation (usingMCE ). The procedure uses a decision heuristic to resolve

conflicts and is suitable for use with massive data sets.

16. ORTHOOrthographic perspective

display

Produces a 3-D orthographic perspective plot of surface data with

optional draping of a second color image.

17. OVERLAYAnalysis/Database QueryAnalysis/MathematicalOperators Analysis/Change-Time Series

Undertakes pixel-wise addition, subtraction, multiplication,division and exponentiation of paired images. Maximum,minimum, -normalized ratio+ and -cover+ are also supported. On

binary images, logical AND and OR operations are supported bymeans of the multiply and maximum operation. Other boolean

operations are supported through various binary image overlaycombinations.

18. PROJECTReformat

Undertakes conversions between reference systems for both vectorand raster files. With raster images, a resampling is undertaken

using either a nearest-neighbor or bilinear interpolation. Supportedprojections include the Mercator, Transverse Mercator, Lambert

Conformal Conic and Plate Carree. By using reference systemparameter files, a limitless number of reference systemconversions can be undertaken. Full forward and backward

transformations are accommodated using ellipsoidal formulas.In addition, users can construct reference system parameter filesfor any system based on a supported projection.

19. RADIANCEDN to radiance conversion

RADIANCE converts raw satellite Dn values to calibratedradiances using lookup tables of gain and offset setting forLANDSAT satellites 1-5 and user-defined values for Lmin/Lmaxor Offset/Gain for other sensor systems. Conversion to radiances is

used to facilitate comparisons between images from differentdates.

20. RESAMPLEReformat Determines the data values for a rectangular grid by interpolationof the values in a different (and possibly warped) grid. Linear,quadratic and cubic mappings between the grids are provided,

along with nearest-neighbor and bi-linear interpolations. Vectorfiles may also be trans- formed with this 'rubber sheet' procedure.

etc.

The IDRISI Menu


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File

The File menu includes all of the general purpose modules for using IDRISI.

Display

The Display menu includes all the tools for either displaying files or for enhancing theirdisplay characteristics.

GIS Analysis

The GIS Analysis menu includes modules for database query, mathematical operators,

distance operators, context operators, statistics, decision support, change/time series

analysis and surface analysis.

Modeling

The Modeling menu includes tools for model deployment, model development and

environmental/simulation modeling.

Image Processing

The Image Processing menu includes tools for restoration, enhancement, transformation,fourier analysis, signature development, classification and mixture analysis, hyperspectral

image analysis and accuracy assessment.

Reformat

The Reformat menu includes a variety of modules for data reformatting.

Data Entry

The Data Entry menu includes modules to facilitate data entry.

Window List

The Window List menu lists all open windows.

Help

The Help Menu provides access to support materials including the Help System andIDRISI Manual.


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Satellite Data Import

IDRISI provides satellite specific and generic tools for importing remotely sensed imagery.

Satel l i te Speci f ic Rou t ines

GACP (Global Aerosol Climatology Project) data --GACPIDRISmodule

HDF-EOS 4 data --HDFmodule

International Satellite Cloud and Climatology Project (ISCCP) Global Processing Center

(GPC) D2 data --GPCIDRISImodule

Landsat ETM data --LANDSATmodule

NetCDF (Network Common Data Form) data --NetCDFmodule

Outgoing Longwave Radiation (OLR) data --OLRIDRISImodule

Physical Science Division (PSD) standard format data --PSDIDRISImodule

RADARSAT data --RADARSATmodule

SAC-C data from Argentina --SACIDRISmodule

SPOT CAP and SPOT Scene data, including GEOTIFF --SPOTmodule

Generic Rou t ines

Other generic routines such asGEOTIFFimport data from popular data platforms like

IKONOS and QuickBird. Other data formats are imported with generic import routines

as indicated below. The utilityGENERICRASTERis commonly used to import satellite

data in generic raster formats. You can find more detailed information on data import in

the Database Development chapter in the IDRISI Manual.


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Getting Started

To start the Idrisi double click on the IDRISI Application icon in the IDRISI Taiga folder. This willload the IDRISI system.

Once the system has loaded notice that the screen has four distinct components. At the top we

have the main menu and underneath we find the toolbar icons that can be control the displayand access commonly used facilities. Below this the main workspace, followed by the statusbar.

Go to file and IDRISI exploer

Now create a new project by clicking the right button of the mouse in the IDRISI explorer


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Now Add the folder in the working folder in the Idrisi and keep all the files of USING IDRISI inthe working folder

Download the satellite images from the following links for the our required district

ftp://ftp.glcf.umiacs.umd.edu/glcf/Landsat/WRS2/p146/r045/p146r045_7x20001028.ETM-EarthSat-Orthorectified/p146r045_7t20001028_z43_nn20.tif.gz

Use the images with name nn20.tif.gz, nn30.tif.gz and nn40.tif.gz for the band 2 (Blue ImageBand), 3 (Green Image Band) & 4 (Infra red image band) purpose.

After downloading this images first unzipped it and keep all in the working folder.

Run the GEOTIFFmodule in the IDRISI Software and open one by one all the nn20, 30 and 40tiff images.
ftp://ftp.glcf.umiacs.umd.edu/glcf/Landsat/WRS2/p146/r045/p146r045_7x20001028.ETM-EarthSat-Orthorectified/p146r045_7t20001028_z43_nn20.tif.gzftp://ftp.glcf.umiacs.umd.edu/glcf/Landsat/WRS2/p146/r045/p146r045_7x20001028.ETM-EarthSat-Orthorectified/p146r045_7t20001028_z43_nn20.tif.gzftp://ftp.glcf.umiacs.umd.edu/glcf/Landsat/WRS2/p146/r045/p146r045_7x20001028.ETM-EarthSat-Orthorectified/p146r045_7t20001028_z43_nn20.tif.gzftp://ftp.glcf.umiacs.umd.edu/glcf/Landsat/WRS2/p146/r045/p146r045_7x20001028.ETM-EarthSat-Orthorectified/p146r045_7t20001028_z43_nn20.tif.gzftp://ftp.glcf.umiacs.umd.edu/glcf/Landsat/WRS2/p146/r045/p146r045_7x20001028.ETM-EarthSat-Orthorectified/p146r045_7t20001028_z43_nn20.tif.gzftp://ftp.glcf.umiacs.umd.edu/glcf/Landsat/WRS2/p146/r045/p146r045_7x20001028.ETM-EarthSat-Orthorectified/p146r045_7t20001028_z43_nn20.tif.gz


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Similarly convert all the file from GEOTIFF to IDRISI

Now Run COMPOSITEModule of IDRISI by creating the Composite Image of all 2, 3 & 4Bands data (This is also called the FCC Image)


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Select all the images in the appropriate boxes and give the name composite in the output imagebox.


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Run the SHAPEIDRModule of IDRISI

Now feed the district shape file from the Idrisi data and make the lat long reference system andgive the same district out put name as below :


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Now open the Jalgaon Composite image (fcc) from the DISPLAY LAUNCHER and than try toADD vector lay layer Jalgaon_lat long from the composer, the message will come that thereference system doesnt match, because the Jalgaon composite image is in the UTM referencesystem where as the Jalgaon _lat long vector layer is in the Lat Long reference system hencefirst convert the Jalgaon_latlong in to the Jalgaon_UTM ref system by running the modulePROJECT under the REFORMATE menu.

Run the PROJECTModule from the IDRISI Software and open the proper file and assign thecorrect reference system


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.

Now Again go to Display Launcher and first open the Jalgaon composite image and than addthe Jalgaon_UTM 44n vector layer through the composer by givin outline black in the symbol fileunder the ADD layer window.


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.

.

The above picture means that the Jalgaon district boundaty has spread over to other tiles also(raster images) hence in the same way just find out which are the other tiles containing theJalgaon district boundary (refer the Diva GIS software)

In the same way open all the geotiff file that contains the Jalgaon district and than run theMosaic module for each and every 20,20 tiff file from all the tiles. (see the picture below )


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Now add the Jalgaon vector layer on the above image


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Now prepare the same mosaic image for 30 and 40 tiff file (i.e. band 3 and 4)


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Now create the composite image of all Mosaic 20, 30 and 40 image

Now add layer the Jalgaon_UTM43n on the composite image

Now open the Mosaic 20 image from the display launcher and add layer Jalgaon_UTM43n on it


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Select the particular one taluka by clicking on the zoom window


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Now keep the cursor on the raster file name in the composer and than save the file by clickingon the SAVE button in the composer.

During saving the file please select the last choice Save current view of highlig hted raster layeras new IDRISI image. (give the name of image as Mosaic_20_Crop for our easy reference.

Now go to the WINDOWModule under the Reformate Menu


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Open it.

Now give the appropriate input file name and output file name and select the An existingwindowed image option in the window specified by table and there select the Mosaic_20_Cropfile.

Similarly make the crop file for the Mosaic 30 & Mosaic 40 file also


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and than run the COMPOSITE module and generate the Composite crop image for all MosaicCrop image file.

Now add the vector layer on it.


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Now to convert the raster file into vector run the RASTERVECTORModule of IDRISI


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Now input the proper data in to it (see the below picture and follow it.)

After clicking OK the INITIALModule will run.

Say YES


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Select any band e.g. Mosaic_20_crop


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Now Run the RECLASS Module for removing all other polygon value except code value 8

Now we want to make the code value 8 is as 1 and all the other taluka value 0 by running theRECLASSModule of IDRISI (give the all input value as shown in the following figure


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The moment you click OK the following image file will generate

Now run the OVERLAY module of the IDRISI


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Now give the proper input into the Overlay module

Click OK


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Similarly create the Overlay image for Mosaic_30_crop and Mosaic_30_crop band data also.

Now create the composite clip image for all the Mosaic_20_Overlay, Mosaic_30_Overlay andMosaic_40_Overlay band data.


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Click OK the composite clip image will create.

Now run the Database workshop module for data base linkage


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When we convert the reference system for the vector layer the database table has converted into other reference system, we have to assign it separately.


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Select the proper check box as shown by red arrow, change the ID_r from UNI_ID in the nameidentified filed.

Than file save and close

Go to collection editor


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The moment you say open, the another window will be open

A

Save it.

Now open the vector layer and check the database linkage

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