Etienne, I am all for the improvements. I am a little short on time for the next 2-4 weeks, but I would like to spend some time on this. I think that the closer we get to a CF-1.x compliant file the better. That also gives us a little better specification to work towards. I hope to have some more time soon to work on this. There does seem to be more interest in the driver and the file format recently.
kss /** * * Kyle Shannon * ksshan...@gmail.com * */ On Wed, Aug 24, 2011 at 14:37, Etienne Tourigny <etienne...@yahoo.com>wrote: > Hi all, > > I would like to start a discussion with those interested about fixing > various issues in the NetCDF driver. > > As it stands, it is not fully CF-1.0 compliant, and produces geographical > grids that are not valid for other software. > Also, the infamous "up-side down" problem has been addressed for importing > netcdfs, but needs to be addressed for exporting. > > Related ticket: http://trac.osgeo.org/gdal/ticket/2129 > I have been submitting patches for some time to fix the related issues. > > I have identified a number of issues, of which the following have been > fixed partially in my proposed patch. > > 1- conform to the cf-1.0 standard for geographical grids (creating lat and > lon dimensions and variables) > 2- make netcdf grids "bottom-up" by default, as all software out there uses > that convention > 3- fix problems related to floating-point / string conversions (also > reported in issue #4200 ) > 4- fix metadata handling and duplication (as reported in issue #4204), and > keep band (variable) metadata outside of the global metadata > > Pending issues: > > 5- how to deal with netcdfs which have no datum? Can we assume WGS84? > These files are extremely common, and CF-1.0 has provisions for > identifying the key variables, but no Proj/Wkt codes. > 6- fix proper export of projected CRS (this is not fully necessary though) > with lat/lon values respecting CF-1.0 > 7- handle time axis properly (at least when creating a netcdf) - that would > be great for import/export of netcdf > > Regards, > Etienne > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev >
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