I have done area comparison for a polygon using grass, raster functions - from branch master & terra functions - from branch terra and found some dissimilarities in the result as you can see in the table.
Area of polygon: 1094.880915 sqkm
WDPA_ID
name
value (grass) sqkm
value (raster) sqkm
value (terra) sqkm
6675
area_2001
997.573036
126.3151016
126.4386520
6675
area_2020
872.536478
21.0387268
21.0594864
-
-
-
-
-
6675
loss_2002
0.762019
0.7674429
1.3987885
6675
loss_2019
8.174405
8.178824
0.5946693
6675
loss_2020
21.054441
21.03873
8.1867638
The area from raster and terra are almost same but the area from GRASS seems reasonable. However, the loss value is similar for GRASS and raster. For terra, it might be error in subtraction from my side while computing loss as I didn't use lossCalc function.
I have done area comparison for a polygon using
grass,rasterfunctions - from branch master &terrafunctions - from branch terra and found some dissimilarities in the result as you can see in the table.Area of polygon: 1094.880915 sqkm
The area from raster and terra are almost same but the area from GRASS seems reasonable. However, the loss value is similar for GRASS and raster. For terra, it might be error in subtraction from my side while computing loss as I didn't use
lossCalcfunction.