RE: rotated grids / RE: redo striped.nc

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Another catch-up:


-----Original Message-----
From: owner-galeon@xxxxxxxxxxxxxxxx [mailto:owner-galeon@xxxxxxxxxxxxxxxx] On Behalf Of John Caron 
Sent: Friday, 24 June 2005 4:33 AM
To: Rob Cermak
Cc: galeon@xxxxxxxxxxxxxxxx
Subject: Re: rotated grids / RE: redo striped.nc

...

Hi Rob:
Generally, projection grids are curvilinear in lat, lon, so what you are saying applies to all those, including the RUC.nc example. However, these are almost always regularly spaced in x,y on the projection plane. We do seem to have a problem in that GML does not appear to have a clean way to specify these projections, unless they are in the EPSG database. 


GML includes components that implement the ISO 19111 standard for
describing coordinate reference systems. Pretty much any earth-based geodetic system can be laboriously specified 
in a document based on either the core CRS schemas or schemas derived
relatively trivially from them. Ain't necessarily pretty, and ain't necessarily easily processed by your favorite client, but it is all there. 
However, the existence of the relatively comprehensive EPSG database
means that, in practice, people tend to skip generating GML-based CRS
descriptions, in favour of using a quick pointer to the EPSG definition.

So much so that there is an OGC URN-scheme to provide identifiers for
EPSG CRS definitions (OGC Recommendation Paper - doc 05-010). Simon 
______
Simon.Cox@xxxxxxxx  CSIRO Exploration & Mining
26 Dick Perry Avenue, Kensington WA 6151 PO Box 1130, Bentley WA 6102
AUSTRALIA
T: +61(8) 6436 8639  F: +61(8) 6436 8555
C: +61(4) 0330 2672 callto://dr_shorthair http://www.em.csiro.au
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