Annual Water Yield, PET

Just a little confused.

I have found AET data. (

So what the necessity of calculating AET from PET in Invest?

Hi @Tookie,

The main reason that InVEST calculates AET is that it is derived from the user’s landcover raster, and is calculated at the resolution of the landcover. The dataset you link is at a 30-arcsecond resolution, which comes out to about 920m at the equator. Many landcover rasters are of a much finer resolution … we commonly see landcover rasters with a resolution of 30m or 90m, so calculating AET on the fly allows us to take advantage of this finer resolution data.

Hope this helps!

Oh it really helps, thank you!