I am new to spatial analysis, and trying to follow this tutorial to generate a topographic wetness index for my area of interest:
http://gracilis.carleton.ca/CUOSGwiki/index.php/Generating_Wetness_Indices_for_Watersheds_in_GRASS
I got as far as generating a flow accumulation map, but got stuck on the upslope contributing area - I don't know my cell area (required in the formula= ‘A * cell area) , or where to get it from.
I looked at related questions, but still don't know how to do it.
أكثر...
http://gracilis.carleton.ca/CUOSGwiki/index.php/Generating_Wetness_Indices_for_Watersheds_in_GRASS
I got as far as generating a flow accumulation map, but got stuck on the upslope contributing area - I don't know my cell area (required in the formula= ‘A * cell area) , or where to get it from.
I looked at related questions, but still don't know how to do it.
أكثر...