Brad Hards <bradh <at> frogmouth.net> writes:
> The problematic part is that "PROJECTION" definition. I was originally going to > argue it should be Mercator_1SP, but it looks like the EPSG decided to change > it (in EPSG::2010.058) to this new "Mercator_variant_A" form, and keep the > "Mercator_1SP" form as an alias. Here is a link to a report that at this moment (2015-04-07) makes query to EPSG database v. 8.6.5 http://www.epsg-registry.org/report.htm?type=selection&entity=urn:ogc:def:method:EPSG::9804&reportDetail=short&style=urn:uuid:report-style:default-with-code&style_name=OGP%20Default%20With%20Code&title=Method%209804%20Mercator%20variant%20A Guidance note document that is asked to be used as an ultimate reference is http://www.iogp.org/pubs/373-07-2.pdf I felt that document somehow heavy to read but it appears in many places that "Mercator variant A" is the primary name since October 2010. This section is from page 34 (of 143) "Three variants of the Mercator projection are recognised , differentiated by the parameters used in the projection definition : Variant A, also known as Mercator (1SP ). The projection is defined with the equator as the single standard parallel, with scale factor on the equator also defined. False grid coordinates are applied at the natural origin of the projection, the intersection of the equator and the longitude of o rigin. See figure 3 below . In the few cases in which the Mercator projection is used for terrestrial applications or land mapping, such as in Indonesia prior to the introduction of the Universal Transverse Mercator, this is the normal method of definition." -Jukka Rahkonen- _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
