id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc
4425,"support more HDF4 files by dropping requirement of ""Signature"" attribute",andreash,warmerdam,"Hi,

I noticed that when I create a HDF4 !ScientificDataSet file directly with the HDF4-API (without GDAL), and I add the attributes ''!TransformationMatrix'', ''AREA_OR_POINT'' and ''Projection'', to the file, GDAL still refuses to read the georeferencing from the file. Once I additionally add an attribute ''Signature'' reading ""Created with GDAL (http://www.remotesensing.org/gdal/)"", GDAL does read the georeferencing correctly.

I personally find this behaviour very strange. My suggestion:

In ```hdf4dataset.cpp```, line 743, in the final ```else``` case, before setting the dataset type to UNKNOWN, check if the required attributes are present and if yes, set the dataset type to GDAL_HDF4",enhancement,new,normal,,GDAL_Raster,unspecified,normal,,HDF4,