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 you have used Watershed (Spatial Analyst) tool, its output is a Raster. Please ensure you use a Raster to Polygon (Conversion) tool to convert it to polygon feature class first.
Then you may use Merge under Edit tab, or Dissolve (Data Management) Geoprocessing tool.
If you have used Watershed (Spatial Analyst) tool, its output is a Raster. Please ensure you use a Raster to Polygon (Conversion) tool to convert it to polygon feature class first.
Then you may use Merge under Edit tab, or Dissolve (Data Management) Geoprocessing tool.
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
How to change NoData cells to a value—ArcGIS Pro | Documentation
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