[Qgis-user] Merging DEMs

[Randal Hale]

Ye gods - you are a genius. I've got a merged DEM with none of the 
overlap - except for the two triangular holes in the DEM because They 
worried about political boundaries...but not overlap of the data.

So I ran this through the Toolbox formerly knows as Sextante. It has 
r.patch as a tool. Luckily I didn't have to go through all the 
convolutions of of building a map set and resolutions and then wondering 
if I've forgotten something.

GDAL Merge didn't work.
Saga Merge Raster Layers gave me the same output as GDAL Merge

Now I just have to explain it to my client and I'm good.

Thanks to all of you who chimed in.....

Randy

-----------------
Randal Hale, GISP
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 rjhale at northrivergeographic.com
twitter:rjhale
http://about.me/rjhale

On 05/29/2014 09:42 AM, Mark Seibel wrote:
> Hi.
>
> On Thu, May 29, 2014 at 9:25 AM, Randal Hale 
> <rjhale at northrivergeographic.com 
> <mailto:rjhale at northrivergeographic.com>> 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.
>
> ...
>
>     Thoughts or ideas?
>
>     Randy
>
>
> Is there a GRASS function in QGIS for r.patch?  It uses both datasets, 
> and uses one to fill the NULL values of another.  Would probably have 
> to make sure the computational region is set to accommodate the extent 
> of merging both DEMs (maybe not necessary if r.patch doesnt regard 
> region settings).
>
> Mark
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20140529/ffe7e140/attachment.html>