[gdal-dev] discussion on improvements to the NetCDF driver and CF-1 convention

[Kyle Shannon]

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

/**
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 * Kyle Shannon
 * ksshannon at gmail.com
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On Wed, Aug 24, 2011 at 14:37, Etienne Tourigny <etiennesky at 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
>
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