How do I Remove Donut From A Polygon

Question

Hi All,

I have thousands of buildings which few contains donuts, according to the customer requirement would like to remove  donuts.

Hence, Kindly provide a solution how can i remove these donuts using .net program.

Thanks in Advance

KristenE · Answer

Here is a Python function that does what you need: def fill_donut(in_lyr): '''Edits a layer in-place and fills all donut holes or gaps in the selected features. Will operate on entire layer if there are no features selected. Requires layer to honor selected features. ''' desc = arcpy.Describe(in_lyr) shapefield = desc.ShapeFieldName rows = arcpy.UpdateCursor(in_lyr) n = 0 polyGeo = arcpy.Array() # to hold edited shape polyOuter = arcpy.Array() # to hold outer ring for row in rows: feat = row.getValue(shapefield) qInterior = False for partNum in range(feat.partCount) : part = feat.getPart(partNum) for pt in iter(lambda:part.next(),None) : # iter stops on null pt polyOuter.append(pt) if part.count > len(polyOuter) : qInterior = True polyGeo.append(polyOuter) # reassemble each part polyOuter.removeAll() # ready for next part if qInterior : # in any part of this feature, otherwise skip update n+=1 row.setValue(shapefield,polyGeo) rows.updateRow(row) polyGeo.removeAll() del rows,row msg = "Features with interior ring filled "+str(n) arcpy.AddMessage(msg) arcpy.RefreshActiveView()‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

JaredCaccamo · Answer

I think Joshua Bixby‌ has the right idea. Take a look at "IPolygon4.ExteriorRingBag" which creates and returns a geometrybag that contains references to all exterior rings. You can take this and create a polygon with it and the donuts won't exist.

Anonymous User · Answer

Yep, IPolygon.FindExteriorRings is the method.

If you want to use geoprocessing or python you can also use the Eliminate Polygon Part tool.