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Replace curve rings by vertices

MaximeDemers

Hi,

Is there a way to replace curve rings in polygon geometries with vertices along the curve using arcpy?

I need to output a specific json of a featureSet but curveRings are not allowed.

Is there a mathematical function that can be used?

Thank you for the info!

Maxime Demers

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Accepted answers

jcarlson

What's the precision of your dataset? Just use that for the tolerance. Using such tiny tolerances retains the non-curved data such that checking whether the original and generalized shapes of non-curved geometry returns "True".

Here's a sample of generalizing non-curved geometry:

All comments

MaximeDemers

@David_Brooks yes that could be a solution, but converting from geodatabase to shapefile brings a lot of side effects that I am trying to get around.

MaximeDemers

That could be a problem because the topology and the precision is important. There must be another way. For instance when you output a geojson, the curves are replaced by vertices because curves are not in the spec of geojson.

David_Brooks

@MaximeDemers , ah i see your problem. No this will densify the whole lot.

Next solution: Shapefiles don't support true curves. If you export to shapefile, any curves will be converted into straight line segments, and you can then convert back into JSON.

Hopefully that will set you on the right track 👍

jcarlson

The generalize function will apply to the entire layer. However, even an extremely small tolerance like 0.1 will break up the curves, while largely leaving the rest of the data unaltered.

MaximeDemers

Hi, thanks for the reply!

Will this generalize the whole geometry or just replace the curve with vertices?

David_Brooks

@MaximeDemers , if you're wanting a script, trying the following, which you can set up as a script with 3 parameters:

import arcpy

inFC = arcpy.GetParameterAsText(0)
tolerance = arcpy.GetParameterAsText(1)
outJSON = arcpy.GetParameterAsText(2)

arcpy.management.CopyFeatures(inFC, r"memory\outFC")
arcpy.edit.Generalize(r"memory\outFC", tolerance)
arcpy.FeaturesToJSON_conversion(r"memory\outFC", outJSON)

jcarlson

Try using generalize on the features first. That should turn your curveRings into segmented lines.

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