I changed the subject, which was "WCS driver"; although it is still relevant for the WCS driver, it's really about GDAL's abstraction.
On 10/24/2017 12:41 PM, Ari Jolma wrote: > Even Rouault kirjoitti 24.10.2017 klo 13:28: >> >> >> >> > The netcdf files I looked at through the GDAL driver had time and/or >> >> > depth offered as different gdal layers, and offered different variables >> >> > (i.e. different coverages) as subdatasets. >> >> >> >> Yes, although in the WCS case, a coverage can have several bands, and >> thus using the band mechanism to reflect the N>2 dimensions can become >> confusing. >> > > Also in NetCDF the time dimension may be as bands - at least I have > marine research data which opens first as having two subdatasets (mean > and max wave height) and then as bands (the monthly values). Yes, bands is what I meant; sorry for confusing this. >> >> >> The only clean solution to that would be to have a true >> multidimensional raster support at the GDAL API level, but that's a >> rather involved effort. >> > > Above the division to subdatasets and bands seems arbitrary and perhaps > not user controllable. I agree it would be useful to have a better data > model in this respect. In my earlier email to this list [1] I suggested to allow querying bands about their time, which would help deal with the case where a large set of bands refers e.g. to both depth layers and time steps, in some order. I too think that multidimensional raster support would be useful. Besides by drastically redesigning data structures, could we get there incrementally? [1] https://lists.osgeo.org/pipermail/gdal-dev/2017-October/047381.html > > Ari > >> >> >> > >> >> > Which other GDAL drivers give direct access to time-varying raster >> >> > stacks in single files? >> >> >> >> I guess HDF5, as it is really close to netCDF. >> >> >> >> GRIB could potentially be used to have time-varying raster, although, >> from what I saw, generally you put instead different variables for the >> same forecast time in the same file. But technically you couldx just >> concatenate any amount of GRIB messages into a single file and this >> will be seen as a multi-band raster by GDAL. >> >> >> >> Even >> >> >> >> -- >> >> Spatialys - Geospatial professional services >> >> http://www.spatialys.com >> >> >> >> _______________________________________________ >> gdal-dev mailing list >> gdal-dev@lists.osgeo.org >> https://lists.osgeo.org/mailman/listinfo/gdal-dev > > > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Edzer Pebesma Institute for Geoinformatics Heisenbergstrasse 2, 48151 Muenster, Germany Phone: +49 251 8333081 _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
