arcpy.SmoothPolygon_cartography not working as expected

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11-21-2018 04:53 PM
ChengCheng
New Contributor

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. 

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DanPatterson_Retired
MVP Esteemed Contributor

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 

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6 Replies
DanPatterson_Retired
MVP Esteemed Contributor

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

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ChengCheng
New Contributor

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. 

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DanPatterson_Retired
MVP Esteemed Contributor

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 

ChengCheng
New Contributor

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 

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DanPatterson_Retired
MVP Esteemed Contributor

Glad it worked out

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JoshuaBixby
MVP Esteemed Contributor

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