added DEM

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@37111 15284696-431f-4ddb-bdfa-cd5b030d7da7

imagery/i.atcorr/test_suite/README.txt

@@ -13,18 +13,20 @@ r.in.gdal ETM4_400x400.raw out=ETM4_400x400.raw -o
 # set region to this map
 g.region rast=ETM4_400x400.raw
 
+# create synthetic DEM, close to sea level
+r.mapcalc "atcorr_dem = 10.0"
+
 # run atmospheric correction on imported channel 4:
 i.atcorr -r --o iimg=ETM4_400x400.raw \
          icnd=./ETM4_atmospheric_input_GRASS.txt \
-         ialt=dem \
+         ialt=atcorr_dem \
          oimg=ETM4_400x400.corrected
 
 # import already corrected test data set for comparison:
 r.in.gdal ETM4_400x400_atms_corr.raw out=ETM4_400x400_atms_corr -o
 
 # compare:
-r.mapcalc "diff = ETM4_400x400_atms_corr - ETM4_400x400.corrected"
-r.colors diff color=differences
-
-r.univar diff
+r.mapcalc "atcorr_diff = ETM4_400x400_atms_corr - ETM4_400x400.corrected"
+r.colors atcorr_diff color=differences
 
+r.univar atcorr_diff