[Proj] ESRI's standard_parallel_1 for Mercator morphedto latitude_of_origin?

[Joseph White]

Mikael,
Yes, I do mean on top of what is done in MorphToESRI.   I'll check the
code to see what I can dig up for examples and post them to the list.

Joe White

-----Original Message-----
From: proj-bounces at lists.maptools.org
[mailto:proj-bounces at lists.maptools.org] On Behalf Of Mikael Rittri
Sent: Friday, October 12, 2012 2:33 PM
To: PROJ.4 and general Projections Discussions
Subject: Re: [Proj] ESRI's standard_parallel_1 for Mercator morphedto
latitude_of_origin?

Joe,
by "parameter name munging", do you mean in addition to what is done by
morphToESRI() and morphFromESRI() in OGRSpatialReference? Can you give
examples?
    Would you agree that for my example, morphFromESRI() makes a
hypercorrection (trying to fix what ain't broken)?
     By the way, I have found the analogous ticket
http://trac.osgeo.org/gdal/ticket/3036
for Equidistant Cylindrical. 

Mikael Rittri
Carmenta
Sweden
http://www.carmenta.com

12 okt 2012 kl. 18:41 skrev "Joseph White" <JWhite at terragotech.com>:

> Mikael,
> It's not just you.  In the course of our software, we have to 
> transition data back and forth from ESRI to GDAL/OGR, and we have to 
> do some parameter name munging to get ESRI to take some of the 
> coordinate system data.
> 
> Joe
> 
> -----Original Message-----
> From: proj-bounces at lists.maptools.org
> [mailto:proj-bounces at lists.maptools.org] On Behalf Of Mikael Rittri
> Sent: Thursday, October 11, 2012 4:43 PM
> To: PROJ.4 and general Projections Discussions
> Subject: [Proj] ESRI's standard_parallel_1 for Mercator morphed to 
> latitude_of_origin?
> 
> This question really concerns GDAL/OGR rather than Proj.4, but anyway:
> 
> I have had a problem that I think was caused by
> 
> http://trac.osgeo.org/gdal/changeset/7542
> 
> which caused the Mercator parameter "standard_parallel_1" in ESRI WKT 
> to be renamed to "latitude_of_origin" during conversion to OGC WKT.
> 
> This makes no sense to me. These are different parameters with 
> different semantics, and according to 
> http://www.remotesensing.org/geotiff/proj_list/mercator_2sp.html
> both of them are valid parameter names for Mercator (2SP) in OGC WKT.
> 
> So why the renaming? Is the semantics subtly different in the ESRI 
> world?
> Or is this just a bug that has survived because a Mercator seldom has 
> a non-zero standard parallel?
> 
> I'd be grateful for comments. 
> 
> Mikael Rittri
> Carmenta
> Sweden
> http://www.carmenta.com
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