On 2011-02-16 12:20, Zoltan Szecsei wrote:
Hi All,
I've built a vrt with 176 images.
I now need to mosaic this whole area into roughly 5 x 5 ortho images.
How can I force the white edges into background of the overlapping
orthos?
I'm a little cautious of simply (finding a way to) making "white"
transparent as it is only the white on the edges that need to be
backgrounded.
Hi again,
Since the above post, I have tried different ways to set nodata, but to
no avail - I still get the white edges:
(see jpeg sent with my original post)
gdalbuildvrt -addalpha -hidenodata -input_file_list files
177_untiled_orthos_nodata.vrt
gdalbuildvrt -srcnodata "0 0 0" -addalpha -hidenodata -input_file_list
files 177_untiled_orthos_blk.vrt
gdalbuildvrt -srcnodata "255 255 255" -addalpha -hidenodata
-input_file_list files 177_untiled_orthos_white.vrt
How should I be masking out the nodata (or even white pixels) so that
when I mosaic a bunch of tiffs together, I dont get the white stripes in
the resulting image?
Using GDAL 1.7.3, released 2010/11/10 on Ubuntu 10.04
Viewing with Quantum GIS - 1.6.0-Trunk on Ubuntu 10.04 (same box).
...but running the whole lot in xterms with Xming & putty from my
WinVista box.
Regards,
Zoltan
--
===========================================
Zoltan Szecsei PrGISc [PGP0031]
Geograph (Pty) Ltd.
P.O. Box 7, Muizenberg 7950, South Africa.
65 Main Road, Muizenberg 7945
Western Cape, South Africa.
34° 6'16.35"S 18°28'5.62"E
Tel: +27-21-7884897 Mobile: +27-83-6004028
Fax: +27-86-6115323 www.geograph.co.za
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