[gdal-dev] gdalwarp no data option

[Even Rouault]

Le mercredi 28 août 2013 10:24:08, garfy a écrit :
> Using gdalwarp mosaic, and setting nodata as "0" , I have been able to
> mosaic successfully.
> But in my case, "0" = no data when out of image extents, and inside extents
> it is a valid value.
> Can some one explain if the value 0 comes in image extents , how does gdal
> handle it ?

You should use a nodata value that isn't a valid value inside the extent of 
your image, otherwise tools processing your mosaic will display the 0 valued 
pixel as nodata.

An alternative to using nodata is to ask for the creation of an alpha band 
with the -dstalpha option.

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