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I'm currently analyzing the change detection for urban expansion over a decade starting from 2006-2016.
How can I use raster calculator in order to know the changes?
For example, from agriculture to urban area and etc. I already classified the images into 4 classes, urban area,vegetation,water bodies and barren land.
Try reclassifying the rasters to a different scale of numbers, such as
urban = 1
ag = 10
forest = 100
water = 1000
Then just subtract the rasters in Raster Calculator:
0 will mean unchanged.
9 will mean ag --> urban
-9 will mean urban --> ag
99 will mean forest --> urban
90 will mean forest --> ag
-99 will mean urban --> forest etc.
