[gdal-dev] Minor documentation problem

[Frank Warmerdam]

John Donovan wrote:
> Hi all,
> I was just perusing the gdalwarp page on www.gdal.org/gdalwarp.html,
> when I noticed this tautological sentence:
> 
> "Mosaicing into an existing output file is supported if the output file
> already exists."
> 
> Any idea what it is meant to say? I presume it is something to do with
> the bounds of an existing output file being used instead of those of the
> input.

John,

It means if the output file already exists then it will be mosaiced into
as opposed to a new file being created.  It isn't just the bounds of the
existing file that are utilized - the whole file is used and the only
thing altered is the pixels replaced as part of the warp/mosaic operation.

I don't think the statement is tautological, but it does seem to be less
than clear, and perhaps a bit redundant.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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