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Data Type File Source
Landuse

Gvrd_2001_landuse
.shp

S:\DataWarehouse\
Landuse\GVRD_2001

20m DEM

092g07_0100_demw
.dem
Downloaded from:
Geobase
20m DEM

092g06_0100_deme
.dem
Downloaded from:
Geobase
20m DEM

092g03_0102_deme
.dem
Downloaded from:
Geobase
20m DEM

092g02_0102_demw
.dem
Downloaded from:
Geobase

Each 20 m DEM showed a quarter of the area I wanted to use; therefore, I was required to merge the 4 dems into one larger dem.  To do this I used the “Mosaic To New Raster” data management tool (ArcMap) and combined the 4 .dem files into one complete .dem file.  In order to export this file into Idrisi I used the “Raster To ASCII” conversion tool in (ArcMap) to convert it to ASCII data.  With this ASCII data I was able to import it into Idrisi using Import - Software-Specific Formats - ESRI Formats - ARCRASTER which converted the ASCII file into a raster DEM file that Idrisi can read.

Once the landuse file was displayed in ArcMap I changed what was being displayed in the layer properties.  In properties, under the symbology tab, I changed the categories to “DESCRIPTIO” and added all values which displayed all the landuse types.  I then cropped the layer to fit my area of interest and used the“Feature To Raster” conversion tool and set the cell size to 15 for better resolution.  As with the DEM files I needed to use the “Raster to ASCII” tool in order to be able to import the Landuse file into Idrisi.