Hello, I'm using gdalbuildvrt to create a virtual raster from multiple tiff tiles. I need the output virtual raster to have an alpha band, and as I do not know beforehand if the input rasters will contain one or not, I use the 'addalpha' option of gdalbuildvrt to add one if needed. As I understand the documentation of gdalbuildvrt, 'Adds an alpha mask band to the VRT when the source raster have none' means that if the source rasters already have an alpha band, no new band should be added. However, when I run the following command on the attached test files (that already contain an alpha band) : gdalbuildvrt -addalpha test.vrt 1.tiff 2.tiff The result vrt contains a fifth band, and thus two alpha bands.
Do I misunderstand the gdalbuildvrt documentation, or is there a problem with my input files ? I tested this with GDAL v3.0.4 provided in the ubuntu 20.04 repository, as well as with GDAL v3.6.0dev-cc78d80d5df3750db317b96d93013d5f70ef6f0a from the osgeo/gdal:latest docker image. Thanks.
_______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
