Re: [gdal-dev] Patch for GDAL Web Mercator Issue / trac 3962

2013-08-29 Thread Michael Rosen
I concur that it is desirable to be able to recognize this projection in which ever "Well Known" Text is appears. To paraphrase Douglas Adams, "this is obviously some strange use of the term well-known that I wasn't previously aware of. msr From: gdal-dev-boun...@lists.osgeo.org [mailto:gdal

Re: [gdal-dev] Patch for GDAL Web Mercator Issue / trac 3962

2013-08-29 Thread Michael Rosen
I considered the very same issue and opted for a pragmatic solution. Here's my internal notes on this: This approach seems consistent with what Frank W proposed: "I am thinking that we should move to treating the pseudo-mercator projection method better

[gdal-dev] Patch for GDAL Web Mercator Issue / trac 3962

2013-08-29 Thread Michael Rosen
A long standing (2011) issue with GDAL's CRS support is its awkward support for the Web Mercator projection. In short, when gdal internally represents this CRS (EPSG code 3857), it does so using the Mercator_1SP projection on the WGS84 datum (not a sphere). Since that's not quite right, it pro