[gdal-dev] gdal_retile and nodata

christian.mueller at nvoe.at christian.mueller at nvoe.at
Thu May 20 11:04:54 EDT 2010

gdal_retile use gdal core functions to rescale and I see no  
possibility to pass a nodata value to these functions.

Have your tiff files a no data value in the meta info.

Quoting acangi <aca at ngi.be>:

> When creating the level x, gdal_retile interpolates the tiles of level x-1.
> If not all data exist in level x-1, it interpolates with nodata values (I
> guess ?). The result is that at the border, we can see almost black values,
> but not exactly black. They become visible when setting the output
> transparent color in GeoServer.
> How can I get rid of them ? nearblack can't output GeoTIFFs yet (gdal
> 1.7.2).
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