ESRI Shapefile troubles with elevation attributes
Tim Hawker
GM Convert
I am having troubles creating TINs / GRIDs from a few ESRI shapefiles (topo) even though they have elevation attributes loaded. I can read the elevation attributes in the database, they just don't seem to be used when I try to create a GRID surface through the control center. I've changed the field to pull the proper elevation information out, but still end up creating flat GRIDs with zero elevation.
I've recently upgraded from v9 to v11.02, just not sure if there's a bug I need to be made aware of? This was a routine process in the older version and was working up until a few days ago...
Any suggestion would be greatly appreciated!!
I've recently upgraded from v9 to v11.02, just not sure if there's a bug I need to be made aware of? This was a routine process in the older version and was working up until a few days ago...
Any suggestion would be greatly appreciated!!
Comments
-
Is it possible your Shapefiles are 3D files with an elevation specified for each vertex? If so those per-vertex elevations would take precedence over any single attribute-based elevation for the feature. You can check for this by selecting the line with the Feature Info Tool, then pressing the Vertices button and checking for an elevation column.
If you do have 3D features with incorrect Z values for each vertex, you can get rid of those by exporting to a new Shapefile and NOT checking the option to create 3D features, then load that new Shapefile back in and grid from that.
Let me know if I can be of further assistance.
Thanks,
Mike
Global Mapper Support
support@globalmapper.com -
Thank you Mike, for your quick response. It seems a few tiles of my source data skipped the bulk export to 2D and slipped through as 3D, causing the troubles you've pointed out. I've since re-exported as 2D and created and exported the GRIDs succesfully. Typical that my few urgent tiles were the files causing the problems.
Thanks again for the help!
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