[Gdal-dev] RE: GDAL netcdf convention CF support

[Simon.Cox at csiro.au]

Note that the addition of temporal operators to the Filter-encoding
specification has been proposed within OWS3. 
A provisional schema is in use in the testbed and is available from the
initiative SubVersion code repository (currently only available to
project participants and observers). 

Simon

> -----Original Message-----
> From: owner-galeon at unidata.ucar.edu 
> [mailto:owner-galeon at unidata.ucar.edu] On Behalf Of Ron Lake
> Sent: Monday, 22 August 2005 2:14 PM
> To: warmerdam at pobox.com; Gerry Creager N5JXS
> Cc: gdal-dev at lists.maptools.org; galeon at unidata.ucar.edu
> Subject: RE: GDAL netcdf convention CF support
> 
> Hi,
> 
> This would seem a natural extension to the OGC WFS 
> specification.  Note that GML incorporates (under features):
> Coverages and support for time (as well as temporal reference 
> systems) and dynamic features.  Extending MapServer to being 
> a WFS that supports these features would be a good place to 
> start.  You can likely go some distance with the existing WFS 
> spec.  What is needed of course is support for 1) temporal 
> data types (MapServer extension) 2) temporal operators (WFS 
> extension) .. 
> 
> Cheers
> 
> Ron
> 
> -----Original Message-----
> From: owner-galeon at unidata.ucar.edu
> [mailto:owner-galeon at unidata.ucar.edu] On Behalf Of Frank Warmerdam
> Sent: August 21, 2005 1:41 PM
> To: Gerry Creager N5JXS
> Cc: gdal-dev at lists.maptools.org; galeon at unidata.ucar.edu
> Subject: Re: GDAL netcdf convention CF support
> 
> 
> On 8/21/05, Gerry Creager N5JXS <gerry.creager at tamu.edu> wrote:
> > Frank, et al,
> > 
> > I think we need to be thinking either about making GDAL more 
> > interested in 3D/4D datasets, as that's coming whether 
> we're ready or 
> > not... in fact, for me, it's already here.. and then see if 
> we need to
> 
> > consider forking or augmenting Mapserver to accommodate it.
> > 
> > I see a lot of conceptual problems for Mapserver, and, for that 
> > matter, a LOT of GIS packages in incorporating 3D/4D data, and 
> > presenting it properly.  This has been an issue for GIS 
> practitioners
> since just about
> >   forever: They think in 2 dimensions and can't, as a group, 
> > appreciate the need for either vertical, or time.  They 
> represent time
> 
> > series data as a series of static images.
> > 
> > I see, in Mapserver, a potential interface.  It's 
> open-source and thus
> 
> > maleable for applications like this.  It won't be simple or 
> > straightforward, and in the end, Mapserver might serve solely as an 
> > example framework for a new 3D/4D display/dissemination tool, but it
> > *is* a starting point.
> > 
> > I'm kinda thinking about a melding of Mapserver and IDV, in 
> th elong 
> > run.
> 
> Gerry,
> 
> The idea of extending mapserver and GDAL to better support 
> 3D/4D datasets has been brought up a few time, and I have 
> generally been quite ... conservative ... in response.  I am 
> concerned about substantial complication and turmoil in the 
> interfaces of both.
> 
> My personal opinion is that in the shorter term it would make 
> more sense to have a distinct multi-dimensional WCS server 
> implemented that might derive some code from MapServer, but 
> that would otherwise be quite distinct.  It would ignore all 
> the vector and "portral" related support in MapServer in 
> favor of focusing on serving n-dimensional raster data via WCS.  
> 
> There could be an n-dimensional equivelent to GDAL as well, 
> that might even include a GDAL plugin for 2D datasets, but 
> that would have it's own interfaces that are more organized 
> to n-dimensional data.  Perhaps it could even be closely 
> related to one of the existing n-dimensional file format 
> libraries like netcdf or HDF (my understanding is that the 
> next general netcdf is based on HDF5). 
> 
> Best regards,
> -- 
> ---------------------------------------+----------------------
> ----------
> ---------------------------------------+------
> I set the clouds in motion - turn up   | Frank Warmerdam,
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial 
> Programmer for Rent
> 
>