arcpy.Polygon Object and distanceTo() - Methode

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08-16-2016 06:04 AM
BernhardEhrminger
New Contributor III

I observed, that calling the distanceTo - Method on Polygons containing circular Arcs can cause python.exe to crash without throwing a exception.

After processing (linearizing the arcs) the polygon featureclass with:

arcpy.Densify_edit(in_features='in_Memory/fc', densification_method='OFFSET', max_deviation=0.001)

it is possible to process the featureclass with "distanceTo" without problems.

I would like to know if this is a bug or a feature? Are there other options of circumventing the problem?

Thank you Bernhard

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JoshuaBixby
MVP Esteemed Contributor

Try the following in a standalone Python window, what do you get?

>>> import arcpy
>>> esri_json = {
...      "curvePaths": [[
...          [1,5],
...          {"c": [[7,3], [6,2]]}
...      ]],
...      "spatialReference": {"wkid": 0}
...  }
>>> ln = arcpy.AsShape(esri_json, True)
>>> ln2 = arcpy.FromWKT('LINESTRING(0 0, 10 0)')
>>> ln.distanceTo(ln2)
1.4903987973986754
>>> ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Circular string and line string adjacent to each other

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6 Replies
DanPatterson_Retired
MVP Esteemed Contributor

I don't have any geometry that uses arcs.  What is the source data type and its current representation?

From here arcs aren't even mentions, however, geometry consisting of vertices and segments should have no problem if you have densified and converted to one of the mentioned geometry types.

JoshuaBixby
MVP Esteemed Contributor

Try the following in a standalone Python window, what do you get?

>>> import arcpy
>>> esri_json = {
...      "curvePaths": [[
...          [1,5],
...          {"c": [[7,3], [6,2]]}
...      ]],
...      "spatialReference": {"wkid": 0}
...  }
>>> ln = arcpy.AsShape(esri_json, True)
>>> ln2 = arcpy.FromWKT('LINESTRING(0 0, 10 0)')
>>> ln.distanceTo(ln2)
1.4903987973986754
>>> ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Circular string and line string adjacent to each other

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BernhardEhrminger
New Contributor III

with ArcGIS 10.2 I obtain:

Traceback (most recent call last):

File "_____________________\jsonarc.py", line 16, in <module>

ln = arcpy.AsShape(esri_json, True)

File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\arcobjects\geometries.py", line 164, in AsShape

return convertArcObjectToPythonObject(gp.fromEsriJson(geojson_struct))

File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\geoprocessing\_base.py", line 483, in fromEsriJson

return self._gp.FromEsriJson(json)

ValueError: Invalid geometry type for method

with ArcGIS 10.3 I obtain your result.

So thank you Yoshua for helping isolating my Problem.

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JoshuaBixby
MVP Esteemed Contributor

I am glad you were able to sort it out.  I took a quick look through the Issues Addressed lists for 10.2.1, 10.3, and 10.3.1; I couldn't see anything that jumped out as this bug being fixed.

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BernhardEhrminger
New Contributor III

astonishing ... I found a secret  bug?

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JoshuaBixby
MVP Esteemed Contributor

I can't say this is unique to Esri, but bugs are like roaches, they are everywhere even if you don't see them. 

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