I am working in ArcGIS and I have an urban center boundary, generated by a population-grid dataset. However, I want to fill in the gaps inside the urban center boundary (see the image below areas marked with red).
Any ideas to do this task?
Create a copy of your features, apply following field calculator expression on field Shape, using Python parser:
def outRing(shp): part=shp.getPart(0) pgon=arcpy.Polygon(part) return pgon
When working on shapefile, no need to switch editing on.