[gdal-dev] An issue about using GDALWARP todotheNTv2transformation

[heng.feng]

Hi Uwe,

Sorry to bother you again. I actually need your help about another GDALWARP problem I am having. I just thought it might be better to send you an email directly about this (a shortcut:)) although I did just post a message regarding this problem on the GDAL DEV forum: http://osgeo-org.1803224.n2.nabble.com/gdalwarp-reprojection-problem-td6030749.html.

I am just wondering whether you have seen this kind of problem before. Do you have idea about what could be the cause for this problem?

Thanks & Best Regards,
Heng
From: Schmitz, Uwe [via OSGeo.org] [mailto:ml-node+5954610-1691648657-308251 at n2.nabble.com]
Sent: 24 January 2011 09:25
To: Heng Feng
Subject: AW: [gdal-dev] An issue about using GDALWARP todotheNTv2transformation

Heng,

>
> Hi Uwe,
>
> I have been trying to use gdal_merge.py to merge
> a few 8 bit colored .tif tiles together. Having
> tried all sorts of options for this command, I
> always ended up with a merged 8-bit grayscale picture.
> I did a search on the internet and found a couple of
> posts related to this, however it seemed to me that
> the gdal_merge.py just does not have the ability
> to preserve the color. Did I get the wrong idea about
> this? Do you have any suggestion to solve this problem?
>
you have to specify "-pct" to grab the color table
of the first merged tile for the result file.
And, very important, all input tiles need to have
the *same* color table, because merging is done
on pixel values (that means channels).

> Not sure if I should post a separate message for
> this gdal_merge.py issue.  I just thought this would
> be the quickest way to get the help :)
>
Yes, IMO a seperate post would have been better and
addressing it to me wouldn't always help to get a fast
response ;-)

Regards
Uwe
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