Re: [Geoserver-users] WMS GetMap 1.1.1 versus 1.3, CRS instead of SRS

Thu, 06 Oct 2011 00:16:26 -0700 

As far as I know, it is geodetic practice/convention (x axis point to the North 
and the y axis to the East).
But why, I don't know.

Sibylle



Von: Andrea Aime [mailto:[email protected]]
Gesendet: Mittwoch, 05. Oktober 2011 17:18
An: Rahkonen Jukka
Cc: [email protected]
Betreff: Re: [Geoserver-users] WMS GetMap 1.1.1 versus 1.3, CRS instead of SRS

On Wed, Oct 5, 2011 at 4:40 PM, Rahkonen Jukka 
<[email protected]<mailto:[email protected]>> wrote:
Andrea,

You are too positive in saying "(there are a few projected ones that flip 
anyways, but they are
a small minority)".  Majority of the compulsory INSPIRE systems are 
Northing-Easting (ETRS89 / LAEA Europe) like
http://epsg-registry.org/report.htm?type=selection&entity=urn:ogc:def:crs:EPSG::3035&reportDetail=short&style=urn:uuid:report-style:default-with-urn&style_name=OGP%20Default%20With%20Urn&title=EPSG:3035

Interesting, I never had to use one so I guess my perception is skewed (all 
common italian projected
systems are in E/N order, so do all of the USA ones I've worked with so far).
Let's check on the database itself (I was not referring to the INSPIRE case, 
but in general).
I created a little program, attached, that scans the EPSG database in its 
natural order and
checks all the projected CRS, seeing what their axis order is.

The result confirm what you said, 30% of the projected SRS in the official 
database, v 7.5,
is indeed in North/East order:

total: 3522
north/east: 1068
unknown: 41

Do you know why this order is preferred? Really makes no sense to me (this is 
not boat/aircraft navigation)

Cheers
Andrea


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