ArcGIS Pro
First, you need to download the Annual NLCD (National Land Cover Database). You can download it from LINK.
You can download as well the HSG (Hydrologic Soil Group) shapefile from LINK.
First, be sure you have projected all the shapefiles and raster in the right projection, that will give you the polygon areas in the right unit, meters or feet. You will need this data.
BUFFER TOOL - to obtain a slightly smaller watershed
Use it to create a smaller watershed shapefile inside the original watershed shapefile. Follow this tutorial.
You obtain the buffer_watershed shapefile.
You have to do it because you will use it to clip the the NLCD raster, and in order to have all the cells of the raster inside the original watershed boundary, you have to clip it with a slightly smaller one.
HOW TO OBTAIN A SHAPEFILE WITH BOTH HSG AND NLCD GRIDCODE VALUES
The purpose is to obtain a shapefile that contains in his attribute table both HSG and NLCD Gridcode values, in order to fill the table in the spreadsheet, as shown in this pictures. The other values in the table will be obtained directly in that spreadsheet.
CLIP RASTER - to clip the NLCD raster with the buffer_watershed shapefile.
Follow this tutorial.
You obtain the NLCD_clip raster.
RASTER TO POLYGON - to convert the NLCD_clip raster into shapefile.
Follow this tutorial.
You have to select the field "gridcode".
You obtain the NLCD_clip_polygon shapefile.
HSG_
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