multiple rasters && mapview

[Jonathan Coles]

Am Dienstag, den 18.01.2005, 13:29 -0500 schrieb Russell Nelson:
> Jonathan Coles writes:
>  > i'm attaching another version of the diffs which include the changes.
> 
> Doesn't work for me.  The map is rendered with the wrong colors and
> flipped top for bottom.  I suspect GetImageData is the guilty party.
> Here's the dataset (137KB):
> 
> http://russnelson.com/potsdam-railroads.tar.gz

yes, GetImageData was to blame. it assumed that the image was palette
based and that there was only one raster band (i only had
iceland_sample_raster.tif to work with). your image is not palette based
and has 3 raster bands (one for each of RGB). 

i've reorganized GetImageData so that it should work with a much wider
range of image: those with no palette and 3 bands (assumed to be RGB,
although gdal works with others, i need conversion formulas. i can get
these later), those with one band and no palette (some greyscale
images), and those with one band and a palette.

there are a few assumptions that are still made. if the image has more
than three bands, like an alpha channel, it will be ignored and you
won't get anything. i hope to be able to do something about this, but i
just wanted to get this working with your data first.

on my machine i can now load your sample data with no problem (had to
change the image path in your .thuban file).

i've attached a complete cvs diff, although the only file that has
changed since my last diff is gdalwarp.cpp.

if you find anything else that doesn't work, please send it to me.

> 
> On the plus side, it generates wrong results MUCH faster.  :-)
> 

great!


--jonathan

-- 
=====================================================================
 Jonathan Coles                               http://www.jpcoles.com
 jonathan at jpcoles.com                    GnuPG Key: /gpg_pub_key.asc
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