Cannot access North Carolina USGS Libre Map Project DRG Maps
Posted 03 November 2017 - 11:49 AM
Posted 07 November 2017 - 08:51 PM
I downloaded one of the North Carolina DRGs at https://ngmdb.usgs.gov/topoview/ ...Waynesville.
Using MicroDEM-4 Build 2015.8.21.100, I opened the DEM (Type TranzDEM64.FileAssoc.dem) for the correspoding Waynesville quadrangle. When I try open the image file NC_Waynesville_165039_1942_24000_geo (file type tif), I get the message "Tiled TIFF file will have problems; Rewrite GDAL (strongly encouraged)?
When I chose "No", I got message "Unsupported TIFF 3075 Projection Option, offset=22". Clicked "OK" and got a "Pick Projection Parameters" dialog box for "WORLD GEODETIC SYSTEM 1984". I bailed out.
Thanks to great help from you and other members years ago, I have successfully created numerous shaded terrain topos using MicrDEM as above, but with DRGs from the Libre Map Project site.
Still being a novice (at best) and having a limted need to do North Carolina projects, I was looking for a simpler approach.
The problem could be as simple as my opening the https://ngmdb.usgs.gov/topoview/ image file in MicroDEM improperly
Posted 08 November 2017 - 09:45 AM
I use a 2011 version of Microdem, JoeFred, so I don't think I can help much with your error messages. I do know there are certain projections that Microdem can't handle. I haven't been using the newer versions because the one from 2011 lets me do regrotation and the new Microdem refuses to coexist with alternate versions of the program.
Here are links to three additional sources for USGS quadrangles. I'm pretty sure the quadrangles at Archive.org will be similar to what was once available from Libre.
Posted 08 November 2017 - 10:34 AM
You, Steve R., are a lifesaver. The Archive.org quadrangle was the ticket.
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