Incorrect Geometry Copied When Using InsertCursor

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04-25-2019 01:35 PM
by Anonymous User
Not applicable

Hello! 

I have a script that runs as a tool in ArcGIS Pro. The script takes each record in a feature class and queries a web service based on some filled in attributes to populate the rest of the attributes. The script uses an UpdateCursor to update the input feature class and then uses an InsertCursor to output it to a new feature class. I've chosen to do it this way since there are multiple features that need to be outputted with slightly different information. For example, if one record has a field that has three different values for it (A, B, and C), I need to create 3 different polygons in the output feature class. (I'm aware that related tables could also work for this part, but that's not relevant to the issue.

The issue occurs when I try to use InsertCursor to transfer the geometry to the output feature class. Somehow, the feature class gets warped somehow? In the screenshot below, the pink polygon is the output and the underlying blue polygon is the input. 

image.png

The output feature class is created with the input as a template so the schemas are essentially identical. Below is the code I use:

with arcpy.da.UpdateCursor(inputClass, ['inputAttribute1', 'inputAttribute2', 'inputAttribute3','inputAttribute4','inputAttribute5', 'SHAPE@']) as cursor:
   arcpy.AddMessage('Creating copies for each control event...')
    destCursor = arcpy.da.InsertCursor(outClass, ['outputAttribute1', 'outputAttribute2', 'outputAttribute3','outputAttribute4','outputAttribute5','SHAPE@'])

## loop through each row in the input feature class
    for row in cursor:

      ## function that retrieves data based on unique identifier from input feature class
       returnJSON = getAttributes(row[0])


      ## the return JSON has a variable that holds an array of objects containing the information for each copy required.
      ## loop updates the row in the input feature class with information and then updates the

       for event in returnJSON['varyingAttributes']:
          if row[1] == event['definingAttribute']:
             try:
                row[2] = event['attribute3']
             except:
                pass

             try:
                row[3] = event['attribute4']
             except:
                pass

            try:
               row[4] = event['attribute5']
            except:
               pass

            ## update the row with the new information
             try:
                cursor.updateRow(row)
             except:
                print('Error: ', row[0])
                pass

            ## insert the updated row into the output feature class before updating it again with new information.
             destCursor.insertRow(row)


   del destCursor


The logic of attribute updating works well, it's just the geometry is the only thing (this description might be overkill, but I wanted to include as much info as possible).

In summary, insert cursor doesn't seem to accurately transfer geometry data.

Any guidance on this is greatly appreciated!

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Accepted Solutions
LukeWebb
Occasional Contributor III

Due to the way your code is written, I cant see much potential for warping of the features via this.

Which mostly, just leaves coordinate systems.

Ensure your input, and output FC have matching coordinate systems. 

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2 Replies
LukeWebb
Occasional Contributor III

Due to the way your code is written, I cant see much potential for warping of the features via this.

Which mostly, just leaves coordinate systems.

Ensure your input, and output FC have matching coordinate systems. 

by Anonymous User
Not applicable

Thanks so much! I wrongly assumed that the template would include the CRS, but I see now that is not the case (as the documentation states below).

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