Update - I did manage to get the vast majority of the features to load - 
still missing 7,000/1,462,918 that showed errors during the LayerMapping 
process. I see a lot of "An error occurred in the current transaction. You 
can't execute queries until the end of the 'atomic' block." so I suspect 
there are fewer than 7,000 errors. I had "Step" set to 1,000. I imagine I 
can figure out how many errors there really are by setting "Step" to 1, 
This will get me started, but I am still very interested in further insight 
regarding my original question.

Thanks,

Steve Watts
On Wednesday, May 11, 2022 at 12:49:35 AM UTC-5 Steve Watts wrote:

> I am running a LayerMapping on a set of ShapeFiles acquired from a County 
> GIS Department. I've done a quite a bit of this, and this is the first time 
> I"ve seen such an issue. As LayerMapping is proceeding through the file 
> saving model instances, it encounters one that it can't handle:
>
> "GDAL_ERROR 1: b'Geometry of polygon of fid 5572 cannot be translated to 
> Simple Geometry. All polygons will be contained in a multipolygon.'"
> "GDAL_ERROR 1: b'organizePolygons() received an unexpected geometry. 
>  Either a polygon with interior rings, or a polygon with less than 4 
> points, or a non-Polygon geometry.  Return arguments as a collection.'"
> "GEOS_ERROR: IllegalArgumentException: Invalid number of points in 
> LinearRing found 3 - must be 0 or >= 4"
> "Failed to save the feature (id: 5572) into the model with the keyword 
> arguments:"
> And the final Exception:
> "GEOSException: Error encountered checking Geometry returned from GEOS C 
> function "GEOSWKTReader_read_r"."
>
> The best description of the issue I can find is 
> https://github.com/r-spatial/sf/issues/1589. In this help thread, and a 
> related one, they talk about a utility called "MakeValid" to resolve this 
> LinearRing issue.
>
> It appears I need to either add a point to any of these "LinearRing" 
> instances, or somehow otherwise fix these items.
>
> I'm not sure that sending the ShapeFiles back to the County to "fix" would 
> be productive.
>
> Does anyone have anything to contribute as far as how I might best move 
> forward with this set of ShapeFiles?
>
> Is there another forum where I should be addressing this issue? Need more 
> information?
>
> Thanks!
>
> Steve Watts
>

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