Merge polygons in watershed

254
2
Jump to solution
06-28-2021 02:39 PM
Labels (1)
AlexiaReyes
New Contributor

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

0 Kudos
1 Solution

Accepted Solutions
JayantaPoddar
MVP Esteemed Contributor

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.



Think Location

View solution in original post

2 Replies
JayantaPoddar
MVP Esteemed Contributor

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.



Think Location
DanPatterson
MVP Esteemed Contributor

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


... sort of retired...