I thinking of creating a vrt for approx 19000 geotiff DEM tiles (SRTM). Any
comments on the performance or practicality of this? Is there a difference in
performance between Geotiff and GRASS as the tile format?
Mainly it's so I can easily extract regions for projects, so it would be
one-shot
On Mon, Apr 5, 2010 at 2:20 PM, William Kyngesburye
wrote:
> I thinking of creating a vrt for approx 19000 geotiff DEM tiles (SRTM).
> Any comments on the performance or practicality of this? Is there a
> difference in performance between Geotiff and GRASS as the tile format?
>
> Mainly it's so
I would be interested in your success or failure. I have a directory of 500
usgs drg map images, and I cannot get them to tile successfully with
gdalbuildvrt. I end up with a black image when I load it in visualization
software. I tried to find a discussion I had on the gdal irc channel some tim
On Apr 5, 2010, at 12:33 PM, Matt Klaric wrote:
>
> On Mon, Apr 5, 2010 at 2:20 PM, William Kyngesburye
> wrote:
> I thinking of creating a vrt for approx 19000 geotiff DEM tiles (SRTM). Any
> comments on the performance or practicality of this? Is there a difference
> in performance betwee
On Apr 5, 2010, at 2:33 PM, Matt Klaric wrote:
> Check out the SourceProperties tag in http://www.gdal.org/gdal_vrttut.html.
> If you specify that for each source image, then GDAL doesn't have to open all
> 19000 images at runtime. The performance is quite good.
That would definitely help, a
On Mon, Apr 5, 2010 at 2:52 PM, John C. Tull wrote:
>
> Looking at the vrt from the file I built with my drg images, I have this:
>
>
>relativeToVRT="1">./barrett_canyon/o39117a4.tif
> 1
>DataType="Byte" BlockXSize="4463" BlockYSize="1"/>
>
>
>
>
> So
On Apr 5, 2010, at 1:29 PM, Matt Klaric wrote:
>
>
> On Mon, Apr 5, 2010 at 2:52 PM, John C. Tull wrote:
>
> Looking at the vrt from the file I built with my drg images, I have this:
>
>
>relativeToVRT="1">./barrett_canyon/o39117a4.tif
> 1
>BlockXSize="4463" BlockYS
FWIW, I've done something similar (worldwide vrt of all cgiar srtm4
tiles), which is working flawlessly and performance is good. However, I
am not using it for direct viewing, just to be able to extract arbitrary
subsets of specific regions with gdalwarp.
If I would think of viewing the entire
