topic arcpy.SmoothPolygon_cartography not working as expected in ArcGIS Enterprise Questions

arcpy.SmoothPolygon_cartography not working as expected

ChengCheng — Thu, 22 Nov 2018 00:53:58 GMT

Hi guys,

I'm having some troubles with smoothing polygons in arcpy. It works well in ArcMap with exactly the same settings but when I use "arcpy.SmoothPolygon_cartography", the polygons are not smoothed, as shown in the images below:

Original:

Result from arcpy:

Result from ArcMap:

I have attached my code, the original shapefile, the result from ArcMap, and the result from arcpy below. The result from ArcMap is exactly what I want but as I have over 1000 shapefiles to process it's not practical to do it manually in ArcMap.

Also I found this bug: BUG-000117346: The Smooth Polygon tool does not smooth the polygons..

However, I was using the PEAK method.

Any help would be much appreciated.

Re: arcpy.SmoothPolygon_cartography not working as expected

DanPatterson_Retired — Thu, 22 Nov 2018 01:28:18 GMT

Your coordinates are in decimal degrees and you need to specify smoothing tolerance value for the paek method... what did you specify?

I also got this warning

WARNING 000269: The cartographic spatial reference does not have a projected coordinate system

which makes sense because if you are trying to smooth with a planar (aka meters/feet) it won't do any smoothing if you chose too large a value

Re: arcpy.SmoothPolygon_cartography not working as expected

ChengCheng — Thu, 22 Nov 2018 02:47:50 GMT

Hi Dan,

This is what I specified in the code:

arcpy.SmoothPolygon_cartography(in_features=filename, out_feature_class=output,
algorithm="PAEK", tolerance="90 Meters", endpoint_option="NO_FIXED", error_option="NO_CHECK")

The tolerance is set to be 90 meters, the same value used in the ArcMap.

Re: arcpy.SmoothPolygon_cartography not working as expected

DanPatterson_Retired — Thu, 22 Nov 2018 16:28:16 GMT

I couldn't find the polygon that you were using for your example. What is the 90 meters tolerance relative to an example polygon perimeter? Maybe it is too coarse, even if it was fine in ArcMap, I know some parameters have changed in ArcGIS Pro Smooth Polygon—ArcGIS Pro | ArcGIS Desktop

Re: arcpy.SmoothPolygon_cartography not working as expected

ChengCheng — Fri, 23 Nov 2018 04:56:30 GMT

Hi Dan,

Yes!!! That's exactly where the problem is. The endpoint_option and the error_option are no longer used in ArcGIS Pro. It works perfectly when I use the arcpy in the ArcMap 10.5 package instead. Thank you for pointing that out! It helps a lot!

Cheers,

Cheng

Re: arcpy.SmoothPolygon_cartography not working as expected

DanPatterson_Retired — Sat, 24 Nov 2018 00:03:47 GMT

Glad it worked out

Re: arcpy.SmoothPolygon_cartography not working as expected

JoshuaBixby — Sat, 24 Nov 2018 04:42:52 GMT

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