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

[Woolf, A (Andrew)]

This is great news, a good step along the road we're all headed. Norman
mentioned what is also the end game for us - the WCS *spec* supports
arbitrary 1-,2-,3- or 4-d slices in a fully 4-d dataset, eg:
 
*3-d volume (lat-lon-height): http://glue.badc.rl.ac.uk/cgi-
<http://glue.badc.rl.ac.uk/cgi-bin/mapserv?REQUEST=GetCoverage&SERVICE=W
CS&Version=1.0.0&Coverage=temp&BBOX=-180,-90,179,90,0,1000&CRS=some3dCRS
&FORMAT=netCDF>
bin/mapserv?REQUEST=GetCoverage&SERVICE=WCS&Version=1.0.0&Cov
<http://glue.badc.rl.ac.uk/cgi-bin/mapserv?REQUEST=GetCoverage&SERVICE=W
CS&Version=1.0.0&Coverage=temp&BBOX=-180,-90,179,90,0,1000&CRS=some3dCRS
&FORMAT=netCDF> erage=temperature&BBOX=-180,-
<http://glue.badc.rl.ac.uk/cgi-bin/mapserv?REQUEST=GetCoverage&SERVICE=W
CS&Version=1.0.0&Coverage=temp&BBOX=-180,-90,179,90,0,1000&CRS=some3dCRS
&FORMAT=netCDF> 90,179,90,0,1000&CRS=some3dCRS&FORMAT=CF-netCDF
<http://glue.badc.rl.ac.uk/cgi-bin/mapserv?REQUEST=GetCoverage&SERVICE=W
CS&Version=1.0.0&Coverage=temp&BBOX=-180,-90,179,90,0,1000&CRS=some3dCRS
&FORMAT=netCDF>  
*Hovmuller (lat vs time): http://glue.badc.rl.ac.uk/cgi-
<http://glue.badc.rl.ac.uk/cgi-bin/mapserv?REQUEST=GetCoverage&SERVICE=W
CS&Version=1.0.0&Coverage=temp&BBOX=10,-90,10,90,500,500&TIME=1996/2005/
1&CRS=some3dCRS&FORMAT=netCDF>
bin/mapserv?REQUEST=GetCoverage&SERVICE=WCS&Version=1.0.0&Cov
<http://glue.badc.rl.ac.uk/cgi-bin/mapserv?REQUEST=GetCoverage&SERVICE=W
CS&Version=1.0.0&Coverage=temp&BBOX=10,-90,10,90,500,500&TIME=1996/2005/
1&CRS=some3dCRS&FORMAT=netCDF> erage=temperature&BBOX=10,-
<http://glue.badc.rl.ac.uk/cgi-bin/mapserv?REQUEST=GetCoverage&SERVICE=W
CS&Version=1.0.0&Coverage=temp&BBOX=10,-90,10,90,500,500&TIME=1996/2005/
1&CRS=some3dCRS&FORMAT=netCDF>
90,10,90,500,500&TIME=1996/2005/1&CRS=some3dCRS&FORMAT=CF-netCDF
<http://glue.badc.rl.ac.uk/cgi-bin/mapserv?REQUEST=GetCoverage&SERVICE=W
CS&Version=1.0.0&Coverage=temp&BBOX=10,-90,10,90,500,500&TIME=1996/2005/
1&CRS=some3dCRS&FORMAT=netCDF>  
*Vertical slice through atmosphere (lat vs height):
http://glue.badc.rl.ac.uk/cgi-
<http://glue.badc.rl.ac.uk/cgi-bin/mapserv?REQUEST=GetCoverage&SERVICE=W
CS&Version=1.0.0&Coverage=temp&BBOX=10,-90,10,90,0,1000&CRS=some3dCRS&FO
RMAT=netCDF>
bin/mapserv?REQUEST=GetCoverage&SERVICE=WCS&Version=1.0.0&Cov
<http://glue.badc.rl.ac.uk/cgi-bin/mapserv?REQUEST=GetCoverage&SERVICE=W
CS&Version=1.0.0&Coverage=temp&BBOX=10,-90,10,90,0,1000&CRS=some3dCRS&FO
RMAT=netCDF> erage=temperature&BBOX=10,-
<http://glue.badc.rl.ac.uk/cgi-bin/mapserv?REQUEST=GetCoverage&SERVICE=W
CS&Version=1.0.0&Coverage=temp&BBOX=10,-90,10,90,0,1000&CRS=some3dCRS&FO
RMAT=netCDF> 90,10,90,0,1000&CRS=some3dCRS&FORMAT=CF-netCDF
<http://glue.badc.rl.ac.uk/cgi-bin/mapserv?REQUEST=GetCoverage&SERVICE=W
CS&Version=1.0.0&Coverage=temp&BBOX=10,-90,10,90,0,1000&CRS=some3dCRS&FO
RMAT=netCDF>  
 
These are all *valid WCS requests*!!! My understanding, however, is that
fundamental 2-D limitations in GDAL will make this extremely difficult
to achieve in Mapserver - any views to the contrary?
 

	-----Original Message-----
	From: owner-galeon at unidata.ucar.edu
[mailto:owner-galeon at unidata.ucar.edu] On Behalf Of Denis Nadeau
	Sent: 17 August 2005 23:26
	To: gdal-dev at lists.maptools.org; galeon at unidata.ucar.edu
	Subject: GDAL netcdf convention CF support
	
	
	GDAL now supports netcdf format using CF convention as specified
by unidata.
	
	
http://my.unidata.ucar.edu/content/software/netcdf/conventions.hdf
	
	The software looks if the variables lat/latitude and
lon/longitude are presents in the netcdf file.  If found, these
variables are used to specify the georeferencing transformation.
	
	I'd like the community to try it out and if there are some
problems, let me know. GDAL netcdf format also works on Windows with he
precompile library version 3.6.1-beta1 (January 2005).
	
	Regards,
	Denis Nadeau
	
	

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