[GRASS-user] using USGS chunked TDDS orthoimagery

[Helmut Kudrnovsky]

>I've downloaded the chunked 0.25m resolution USGS orthoimagery (Ortho TDDS)
for a given quad; it >comes in 90 zipped folders. I've unzipped them all and
now I'm struggling to figure out an efficient way to >bring them into a
given location, ideally to mosaic the orthoimage tiles together, and then
export the 90 >tiles (or mosaic'd) raster to some commonly-used format such
as PNG.

what about using gdal?

see http://www.gdal.org/gdalbuildvrt.html

gdalbuildvrt: Builds a VRT from a list of datasets. 

you can read the orthoimages by gdal without unzip, see:

http://trac.osgeo.org/gdal/wiki/UserDocs/ReadInZip

then you can use gdal_translate (http://www.gdal.org/gdal_translate.html) to
translate the raster VRT into _one_ (big) orthoimage.



-----
best regards
Helmut
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