python to identify curved segments

I posted a similar question on the ESRI forums, but the posting seems to have gone cold :(

Anyone know how to identify if an ESRI feature class contains curved, (arcs) segment(s)?

I have several thousand feat. classes, something via python would be great!

thanks!

Edit: update

someone at esri has commented that you can detect if a polyline feature contains an arc segment by comparing the "truecentroid" and "centroid" of the feature. if truecent. <> cent: then the feature contains an arc. This is OK, but I'm still lacking a solution for polygons, as the above method does not work.

Here's what we have so far:

lstFCs = arcpy.ListFeatureClasses("*", "Pol开发者_StackOverflowyline")

for fc in lstFCs:
    rows = arcpy.SearchCursor(fc)
    print fc
    for row in rows:
        type = row.Shape
        geom = str(type.centroid.X)
        truegeom = str(type.trueCentroid.X)
        if geom != truegeom:
            print row.ObjectID

del row, rows

For the polygons I think you have to first loop through the rings of the polygons to find polylines and then you can examine the polylines as you do in your code.

Sorry I cannot help you any further since I don't have ArcGIS installed (and it is all long time ago I worked with ArcGIS). You might get better response on gis.stackexchange.com.

Try something like this:

import arcpy, json

arcpy.env.workspace = r"..." #Your database
lstFCs = arcpy.ListFeatureClasses("*", "Polyline")

for fc in lstFCs:
    rows = arcpy.SearchCursor(fc)
    print fc
    for row in rows:
        jsonGeometry = json.loads(row.Shape.JSON)
        if 'curve' in jsonGeometry or 'curveRings' in jsonGeometry:
            print row.ObjectID
    del row, rows

There is a standard function in Geospatial SQL that is useful for what you want to do. It is called ST_CurvosityIndex(LineString). Applied to a feature LineString gives it an index number between 1-0. 1 means a straight line, 0 a string of lines that have start and end points at the same coordinate.

Unfortunately, I couldn't find any other information on how the algorithm behind this SQL/MM statement was implemented, but I think you can email Alessandro Furieri a.furieri@lqt.it, who developed that SQL statement, asking him about the algorithm that distinguishes how curved the LineString feature is.