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How to change vertices from NaN to measures in a polylineZM feature?

JustinSaarinen

Hello, I am in ArcPro trying to express (or edit) the M value in the vertices of a PolylineZM feature. The vertice editor shows 'NaN' still, and the M and Z are greyed out. So when I extract the vertices as points from the polyline and attempt to calculate the M geometry into a new field, I get <Null>.

I used to be able to do this in ArcMap in the sketch properties as described in this help doc: Editing a vertex's m-value or z-value—Help | ArcGIS for Desktop

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Accepted answers

Scott_Harris

Justin,

The Create Routes tool will create a new "route" feature class, which will have the M-values populated in the geometry. As far as getting those m-values from the geometry to the attributes - I would look into using the Add Geometry Attributes tool that Robert LeClair‌ mentioned above. With lines, you can get the start, middle, and end m-values.

Thanks,

Scott

All comments

JustinSaarinen

And yes, Set as Distance is just what I am looking for. I need to do this soon so hope I don’t have to regress back to ArcMap to do it.

JustinSaarinen

Thanks Scott, I’ll give it a try ASAP.

So you recommend this tool to set the M coordinates (station measure along the length) of the existing vertices (currently NaN) in an polylineZM feature class in order to calculate M geometry (length) into a new field of the extracted vertices feature class?

Scott_Harris

Hi Justin,

I think I understand. For now, you can run the Create Routes geoprocessing tool to get a route layer with m-values populated:

Create Routes—Help | Documentation

In the next release of Pro, you will be able to use the Edit Vertices tool > select an m-enabled feature > right click on it and use the Set As Distance command (same as in ArcMap: Setting measures as distance—Help | Documentation )

Does that help?

Thanks,

Scott

JustinSaarinen

Hi Scott, thanks for the reply and follow up question. I have a big polylineZM dataset of routes and need to populate the Measure geometry in the vertices (The z is already there) so that I can extract and the compare the Z and M. Pretty classic elevation profile. Is there functionality in ArcPro to do this yet?

Scott_Harris

Hi Justin,

In the Edit Vertices grid, you can click on the "NaN" and change it to whatever m-value it should be. What specific functionality did you need?

Linear Referencing editing is on the ArcGIS Pro Roadmap. You will see more options for editing M-values coming in the next release (2.6).

Thanks,

Scott

Robert LeClair

Have you tried the Add Geometry Attributes geoprocessing tool? There are various Point_M values that can be calculated.

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