I am looking for a way to merge all the polygons with a specific condition in another polygon layer.
I am creating a feature layer with a subset of the polygon feature class and when I run the Union the final result does not merge the polygons I selected.
This is what I am doing
in Model Builder
- Select all polygons from FC grid polygon that are located in Area =1
- run Union tool
This creates a new FC that shows the same subset, not the expected result only 1 polygon.
What am I missing?
Thank you for your answer Mehdi and Dan,
I am confused because with ArcMap I am able to select the same out put layer, open an edit session, select all the polygons form my select, run the Union and it merges all the polygons in one.
So the Union in ArcMap does not work the same way as the Union in ModelBuilder.