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Table 3 Results of Grass GIS r.cross module between CVA map and MAF map (first component thresholded and classified for negative and positive values) in terms of pixels count and percentage over the study area for both case studies

From: A combined change detection procedure to study desertification using opensource tools

    Oasis Lake
r.cross categories CVA classes MAF1
values
Pixels count % Pixels count %
1 No data Negative 990 0.31 1043 0.19
2 Positive 857 0.27 200 0.04
3 1st quadrant (Moisture reduction) No data 685 0.21 143 0.03
4 Negative 39 0.01 182 0.03
5 Positive 1 0.00
6 2nd quadrant (Chlorophyll increase) No data 5551 1.73 2808 0.52
7 Negative
8 Positive 8427 2.63 7406 1.37
9 3rd quadrant (Higher moisture land and water bodies) No data 1420 0.44 17215 3.19
10 Negative
11 Positive 390 0.12 9882 1.83
12 4th quadrant (Bare soil and bare sand expansion) No data 16172 5.05 3645 0.68
13 Negative 6015 1.88 22480 4.16
14 Positive
15 No data No data 279454 87.33 474995 87.96
   Total 320000 100 540000 100