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<font size=3>Frank,<br><br>
I have a question about the usage of <br><br>
-scrnodata <i>value [value...]</i>: Set nodata masking values for
input bands (different values can be supplied for each band). If more
than one value is supplied all values should be quoted to keep them
together as a single operating system argument.<br><br>
It's not clear to me what's written on the second sentence. How
would I specify to set masking for the following RGB values 0 0 0, 0 0
17, 0 0 22, 0 22 0? <br><br>
Would it be --scrnodata "0 0 0" "0 0 17" "0 0
22" "0 22 0"?<br><br>
Thanks,<br><br>
Reinaldo<br><br>
At 08:41 PM 6/6/2006, Frank Warmerdam wrote:<br>
<blockquote type=cite class=cite cite="">Reinaldo Escada Chohfi
wrote:<br>
<blockquote type=cite class=cite cite="">Matt,<br>
I've been successfully using the attached command lines in .bat files to
crop and mosaic a large number of tiles. Frank suggested to use
gdalwarp because my input images are large (approx. 2 GB each) and
gdal_merge loads entire images in memory and I was running into problems.
You have to use gdal_merge first to create the image and them use
gdalwarp to mosaic. In my case the src and dst srs are the
same.<br>
I also use gdal_translate because I load the tiles into another program
that wants tiffs as INTERLEAVE=PIXEL.</blockquote><br>
Reinaldo,<br><br>
I would add that gdalwarp should now support many input files, like<br>
gdal_merge, and that creation options can be used directly with
gdalwarp.<br>
So, in theory your case could be expressed as:<br><br>
gdalwarp -te 569600 10064800 578300 10057600 C:\Subsets\input\*.tif
CD-043.tif<br>
-co
INTERLEAVE=PIXEL<br><br>
The many files in gdalwarp support was new for GDAL 1.3.2 in an
effort<br>
to de-emphasize gdal_merge.py.<br><br>
Best regards,<br>
-- <br>
---------------------------------------+--------------------------------------<br>
I set the clouds in motion - turn up | Frank Warmerdam,
warmerdam@pobox.com<br>
light and sound - activate the windows |
<a href="http://pobox.com/~warmerdam" eudora="autourl">
http://pobox.com/~warmerdam</a><br>
and watch the world go round - Rush | President OSGF,
<a href="http://osgeo.org/" eudora="autourl">http://osgeo.org</a><br>
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