topic joining a raster to a point vector file in Data Management Questions

joining a raster to a point vector file

JohnMaclachlan — Wed, 14 Apr 2010 02:31:25 GMT

Hello Everyone,

I have a simple question (I think) but it is stumping me at the moment. I have a DEM file and a data file and all I want to do it a spatial join where I assign the elevation from the DEM to the existing point. Is this as easy as I think it should be?

Thanks

Raster Data to Point File

LesVilchek — Wed, 14 Apr 2010 11:07:53 GMT

You can try the "Extract Values to Points" tool under Extraction in Spatial Analyst tools. Or Hawth Tools has an "Intersect Point Tool" under Analysis Tools. It's more friendly as it just adds another field to the point file into which it places the raster data values. Performance is spotty though. Sometimes it works fine, other times not so well. Double-check your output. Good luck!

ESRI BUG? "Extract Values to Points" FAILS to update Z-value for a Point Feature

GuyHoyle-Dodson — Wed, 14 Apr 2010 16:15:49 GMT

Extract to Point will not update z-value for a point feature. I've moved points in the vector point layer using editor, then used "Extract Values to Points" to extract the new position coordiantes. I've also done this by using 3D Analyst to convert a multiple point feature to a 3D feature, based on an underlying LiDAR Raster DEM, and then applied XToolsPro's Add X,Y,Z Coodrinates tool. The z-value is not updated. I check this by pointing the Identify Tool at the moved point, where I get a new z-value, but this is not reflected in the point feature's new attribute table. Does anyone have a clue what is going on here?

joining a raster to a point vector file

JohnMaclachlan — Thu, 15 Apr 2010 10:20:11 GMT

Thank you for your help!