Documentation: Hierarchical structure of ArcPy Geometry class

Bud — Tue, 08 Feb 2022 19:54:38 GMT

In the ArcPy Geometry Class documentation, could ESRI provide more detailed information about the hierarchical structure of gemetries?

For example, provide a hierarchical diagram, kind of like we have for the SDE.ST_GEOMETRY spatial type, but for the ArcPy Geometry class:

Like this, but better:

 - Geometry
    - PointGeometry 
    - Multipoint
        - Point
    - Polygon
        - Ring (aka part)
           - Point
    - Polyline
        - Path (aka part)
           - Point

That would help people who are trying to learn ArcPy understand how to access the various levels of the Geometry class.

I know there is some info about that in the Cursor docs. But it doesn't explain the hierarchical structure of geometries.

For example, as a novice, it was difficult to know how to iterate through a Polyline's components — to get at the individual points/vertices within a feature-part:

import arcpy
connection = "Database Connections\my_conn.sde"
feature_class = connection + "\my_owner.my_fc"

with arcpy.da.SearchCursor(feature_class, ["SHAPE@","OID@"]) as cursor:
    for row in cursor:
        geometry = row[0]
        print("Geometry/Polyline: {}".format(row[1]))
        for i, part in enumerate(geometry):
            print(" Part: {}".format(i))
            for j, point in enumerate(part):
                print(" Point: {}".format(j))

>>> 
Geometry/Polyline: 100
  Part: 0
    Point: 0
    Point: 1
    Point: 2
    Point: 3
    Point: 4
  Part: 1
    Point: 0
    Point: 1

It would help a lot if if we could get some more detailed information about the hierarchical structure.

Thanks.

Re: Documentation: Hierarchical structure of ArcPy Geometry class

DWynne — Tue, 08 Feb 2022 18:18:10 GMT

Hi @Bud, there is some discussion about geometry structure in this topic: https://pro.arcgis.com/en/pro-app/latest/arcpy/get-started/reading-geometries.htm

Is this sufficient, or is there more information you'd like to see?

Re: Documentation: Hierarchical structure of ArcPy Geometry class

Bud — Tue, 15 Feb 2022 18:16:09 GMT

@DWynne

Yes, now I realize that the Geometry class isn't as hierarchical as I originally thought. So I think the link you mentioned is sufficient.

Thanks.

Re: Documentation: Hierarchical structure of ArcPy Geometry class - Status changed to: Already Offered

DannyMcVey — Thu, 06 Oct 2022 18:19:40 GMT

idea Documentation: Hierarchical structure of ArcPy Geometry class in ArcGIS Pro Ideas

Documentation: Hierarchical structure of ArcPy Geometry class

Re: Documentation: Hierarchical structure of ArcPy Geometry class

Re: Documentation: Hierarchical structure of ArcPy Geometry class

Re: Documentation: Hierarchical structure of ArcPy Geometry class - Status changed to: Already Offered