Re: [GRASS-user] Virtual Mosaic import with r.external

[Markus Neteler]

On Thu, Dec 25, 2014 at 2:20 AM, Jeshua Lacock jes...@3dtopo.com wrote:

 On Dec 24, 2014, at 5:10 PM, Jeshua Lacock jes...@3dtopo.com wrote:

 I was following along the Large raster data processing wiki with great 
 interest:

 My question is, when tiles are merged in GRASS using a virtual mosaic 
 created with gdalbuildvrt, will transparent map collars be preserved?  I see 
 the man page for r.external talks about the requirement to build a mask or 
 use r.mapcalc, but I don’t understand how I would apply that to a virtual 
 mosaic. Is

 It appears that GDAL_TIFF_INTERNAL_MASK may be just what I need to use. I 
 wonder if that option is respected using r.external? Thanks!

I suppose that would apply to r.external.out as it seems to be related
to the creation of GeoTIFF (see http://www.gdal.org/frmt_gtiff.html).

Markus
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Re: [GRASS-user] Virtual Mosaic import with r.external

[Jeshua Lacock]

 On Dec 26, 2014, at 2:54 PM, Markus Neteler nete...@osgeo.org wrote:
 
 I suppose that would apply to r.external.out as it seems to be related
 to the creation of GeoTIFF (see http://www.gdal.org/frmt_gtiff.html).

Hi Markus,

Excellent, thank you for the tip!

Note I tried again using r.patch.many with a smaller batch last night (333 
billion pixel mosiac) and it ran *much* better, but I think it is stuck now.

Here is a screen shot when it was cranking away:

http://3DTOPO.com/r.patch.many.1.png

The “Bytes Read” has been going up continuously for the r.patch processes, but 
the bytes written hasn’t changed in over 8 hours and appears stuck at 57%. I 
think I can use r.patch.many for the job but I will have to break it into 
smaller sub-mosiacs first.  

http://3DTOPO.com/r.patch.many.2.png


If I understand importing a virtual mosaic correctly, I suspect using 
r.external with a virtual mosaic is the best way to accomplish the task at 
hand, but I welcome any advice!


Thanks again,

Jeshua Lacock
Founder/Engineer
3DTOPO Incorporated
http://3DTOPO.com
Phone: 208.462.4171

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