topic Re: Export Line Geometry? in Geoprocessing Questions

Export Line Geometry?

ZachSchenk — Tue, 06 Jun 2017 16:23:21 GMT

Hello All,

I'm trying to do some external analysis on a line that I have in ArcGIS. In order to do this, I need to export the line geometry so that I can see the line as a series of 'nodes'. Is there any way to find and export these nodes to a csv format? I know this is possible with QGIS so I expect its possible in ArcGIS as well... but I just can't seem to find it.

I also don't really need it in a csv, basically I need to run these points through a matlab script to calculate curvature ( I find that ArcGIS Curves and Lines tool isn't particularly useful for what I'm trying to do), so as long as these points are in a format that Matlab can read, I'm happy.

Any tips or help is appreciated!

Thanks,

Zach

Re: Export Line Geometry?

BruceHarold — Tue, 06 Jun 2017 16:52:28 GMT

The Feature Vertices to Point geoprocessing tool (advanced license) might be what you need, followed by Add XY Coordinates then export the attribute table to TXT.

Re: Export Line Geometry?

ZachSchenk — Tue, 06 Jun 2017 18:11:42 GMT

Any tips if I only happen to have a Standard License?

Re: Export Line Geometry?

DanPatterson_Retired — Tue, 06 Jun 2017 18:17:32 GMT

you can use the free stuff provided by esri if you know a bit of python. FeatureclassToNumPyArray then save the coordinates out from numpy/python using savetxt. Gives you a nice file which you can then use anywhere

Re: Export Line Geometry?

JoshuaBixby — Sat, 11 Dec 2021 18:34:32 GMT

Something like the following will create a list of named tuples for all of the points that make up the vertices for all of the lines in a polyline feature class:

>>> from collections import namedtuple
>>> 
>>> line_fc = # path to line feature class
>>> point_record = namedtuple('point_record','line_oid x y')
>>> points = []
>>> with arcpy.da.SearchCursor(line_fc,["OID@","SHAPE@"]) as cur:
...     for oid, shape in cur:
...         points.extend([
...             point_record(oid, point.X, point.Y)
...             for part in shape.getPart()
...             for point in part
...         ])
...         
>>> ‍‍‍‍‍‍‍‍‍‍‍‍‍‍

You can take the list of named tuples and either write it out to CSV or using an insert cursor to create a table or something else.

Re: Export Line Geometry?

JoshuaBixby — Sat, 11 Dec 2021 18:34:35 GMT

I like Dan Patterson‌'s suggestion/approach more:

>>> line_fc = # path to line feature class
>>> points = arcpy.da.FeatureClassToNumPyArray(
...     line_fc,
...     ["OID@", "SHAPE@X", "SHAPE@Y"],
...     explode_to_points=True
... )
... 
>>> ‍‍‍‍‍‍‍‍