topic Re: CAD Contour Z Values in Data Management Questions

CAD Contour Z Values

JamieJohnston-Stewart — Thu, 22 Jul 2010 13:37:15 GMT

I have a .dwg of contour lines, but there are no elevation values associated with the lines. Is there a way to add z values to these lines? I have a DEM of the area.

Thanks for your help.

Jamie

Re: CAD Contour Z Values

KarenHodge — Mon, 26 Jul 2010 15:20:41 GMT

Hi Jamie. I'm not sure if I understand your question, but here's some info:

If the DWG file includes lightweight polylines to represent the contours, ArcMap reads the elevation of the pline as the z value. If you want that Z value as an attribute, you can copy the cad feature class to a geodatabase and then use the GP tool "Add XY" to add the x, y, z coordinates as attributes.

If the lightweight polylines don't have an elevation, but have text near the line that represents the elevation, you may be able to use a spatial join or geoprocessing tools to associate the text as an attribute of the contour line.

Hope this helps!

Re: CAD Contour Z Values

KathleenGould — Mon, 15 Aug 2011 17:12:57 GMT

I am having the exact same issue...

Did you get it figured out?

I know the elevation for each line and have a field of those values in the attribute table...how do I get Arc to recognise that as the 3D elevation data?