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Hi John, This is a serious general problem I think. In the case of parameterized projections you could express the projection in something GIS-friendly like WKT, but not all of these projections will have an EPSG code of course. (CRS identifiers don't need to be EPSG codes, one could come up with another authority, but that's not the real issue.) It is a real problem that there are an infinite number of CRSs but WxS expects the CRS to be identified by a code. Perhaps a WxS extension could use a resolvable URI as the code, which points to a document that describes the CRS in machine-readable form? We also have the problem of the "arbitrary" coordinate systems that can only be expressed through an exhaustive listing of the lat-lon points that comprise the grid. I think this is one of the main challenges for mapping CF-NetCDF to OGC. Cheers, Jon On Thu, Oct 9, 2008 at 12:48 AM, John Caron <caron@xxxxxxxxxxxxxxxx> wrote:
Hi Ron, Peter, et al: I think what follows is the same issue that Aaron brings up, or at least a small part of it. Our data typically uses CRS that are described by parameterized projection functions. eg, Lambert Conformal, with parameters lat/lon origin and two standard parallels. Thus there are an infinite number of possible CRS. Is there a way to map that into an EPSG code and/or form a URN? apologies if this is obvious.
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