Hi all, I just noticed that GDALBuildOverViews disregards all nodata pixels. While this is useful in many cases, sometimes it can be desired to NOT overlook nodata pixels.
For example, I have a raster of sparse data (many nodata pixels), that I am using gdaladdo to make down-sampled versions. The workflow is: use gdaladdo with "mode" resampling and then gdal_translate to get final downsampled image. A problem occurs on the edges of valid data, overview pixels get set to a value which is clearly non-dominant in the higher-resolution data - that is mostly nodata pixels. As the algorithm disregards the nodata pixels, result is the most frequent valid data pixel. Would it be easy to fix this, or am I better off just making a copy of the file without nodata, and then adding the nodata later? Thanks Etienne _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
