It's currently at ISO for comment.Īlthough I have some documentation on 'best practices' for writing an Esri-flavor prj string, it's not been published in the documentation. Over the past two years or so, a new specification has been hammered out. Because it was a very loosely defined specification, there arose many, sometimes subtly, different implementations. It was revised and extended by other OGC specifications. The original specification was written by Esri many moons ago for OGC based on the mid-1990s version of the EPSG Geodetic Parameter Dataset's schema. There's some information on the OGC Call for Comments page on the new specification for coordinate reference system WKT standard.
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