I made a watershed using spatial analysis/hydrology tools. Now, I need to merge the polygons that make up the watershed to make one large polygon. When I try to select the polygons I want to merge, the merge feature under the editor tab is grayed out. It does not allow me to use the data management/ merge tool either. Not sure how to work around this
Solved! Go to Solution.
if your watersheds numbered from 0 onward, you can simply use
raster >= 0
where raster is your raster's name
or a combination of IsNull and Con
if you just use IsNull, you will get a raster where 1 represents null values and 0 represents all your combined watersheds. you can then use Con to convert 0 to a value, or simply query the previous raster for values == 0