On 2014/05/29 15:25, Randal Hale wrote:
I have two Digital Elevation Models - Imagine a square cut into two
equal triangles.
No matter how I do it - One DEM overwrites the other one so I'm only
ever getting half of the elevation model I want when I merge them. It
appears GDAL only takes the last Elevation model and uses that to
overwrite the First. I've tried making no-data transparent....I've
converted the img to a tif (these are 1/9 DEMs from the USGS National
Map). In someone's infinite wisdom they were cut at the North
Carolina/South Carolina State Line.
Thoughts or ideas?
Randy
Sounds a bit like "the other triangle" is filled with null type values?
Try looking at them as points in QGIS or something to see if the blank
halves actually carry data which is overwriting the other half when you
merge them.
I have no experience using USGS DEMs (btw :-) )
HTH
Zoltan
--
===========================================
Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
GIS and Photogrammetric Services
P.O. Box 7, Muizenberg 7950, South Africa.
Mobile: +27-83-6004028
Fax: +27-86-6115323 www.geograph.co.za
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