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

[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-bounces at lists.osgeo.org [mailto:gdal-dev-bounces at lists.osgeo.org] On Behalf Of Frank Warmerdam
Sent: Thursday, August 29, 2013 2:32 PM
To: Stefano Iacovella
Cc: gdal-dev
Subject: Re: [gdal-dev] Patch for GDAL Web Mercator Issue / trac 3962

Folks,

I have no problem with EPSG code 3857 as a PCS in GeoTIFF files.  It is widely accepted that any EPSG PCS is acceptable there.

What is less clear to me is the most appropriate formulation of Web Mercator in WKT.  Potentially, we could move to encoding semi_major and semi_minor in the projection parameters as overrides, and then translate to the ESRI format and back in our morphing code.

Mike, if we do incorporate your patch, I think we should also consider ways of recognising some of the other variations.

Best regards,
Frank


On Thu, Aug 29, 2013 at 2:05 PM, Stefano Iacovella <stefano.iacovella at gmail.com<mailto:stefano.iacovella at gmail.com>> wrote:

2013/8/29 Even Rouault <even.rouault at mines-paris.org<mailto:even.rouault at mines-paris.org>>
My main question is : how sure are we about the projection name
"Mercator_Auxiliary_Sphere" to be the appropriate one for "standard" WKT ? Is
there some reference from that ? The fact that ESRI uses it doesn't make it
necesserarily a standard (although it can serve as a base if there's no
alternative).

According to http://epsg-registry.org/, not an ISO standard but quite a de facto standard, EPSG:3857 is "WGS 84 / Pseudo-Mercator "

Kind Regards,
Stefano
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