I need to get information about any occurrences of NoData in an elevation raster. Simply by looking at the raster it is not possible to determine if and where any holes of NoData are present, so a technical method is needed.
Primarily I would like to obtain polygons of any NoData areas in the raster (i.e. vectorization). Another option would be to obtain a 1-bit raster which simply indicates true/false for NoData, but vector features would be much better.
How can this be accomplished?
This Question is more or less unrelated to a specific software, though I prefer using free software like QGIS, GDAL/OGR etc.