[x3d-public] new web Mercator geoSystem proposal

[Andreas Plesch]

Section 25.2.4 needs to include:

WM: (<x>, <y>, <elevation>). These values are all given in units of metres.
The x and y values represent Web Mercator coordinates with an origin at 0
degrees latitude and longitude, based upon the WGS84 ellipsoid. The
elevation is also with respect to the WGS84 ellipsoid.

EXAMPLE  (-13601393.87, 4502102.12, 0) is the Web Mercator coordinate for
Menlo Park, California, USA.



On Mar 21, 2016 9:36 PM, "Andreas Plesch" <andreasplesch at gmail.com> wrote:

x3d v.4 should support a new, web Mercator geoSystem.

https://en.wikipedia.org/wiki/Web_Mercator

is the projection used for all web mapping (slippy maps). Having it
available will make it possible to use such maps in a precise manner within
the geospatial component.

Section 25.2.3

http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/geodata.html#Specifyingaspatialreference

will need to be amended by

"*WM*" - Web Mercator. No additional arguments are supported. An example
spatial reference frame definition of this format is [ "WM" ].

I can come up with an entry for section 25.2.4. as well.



-- 
Andreas Plesch
39 Barbara Rd.
Waltham, MA 02453
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