Thank you. I saw the proj4js Trac website, but there were no tickets entered, so I assumed it was not in use.
There is now one ticket open...hope someone else finds the NZMG transformation useful. Stephen On Thu, 2008-07-10 at 09:07 -0400, Mike Adair wrote: > Cool! We're still in the process of moving the project infrastructure > for proj4js but in the meantime you can enter a ticket and patch in the > Trac system at: http://trac.osgeo.org/proj4js/ > And eventually it should make it's way into the code base. > > Mike > > > > Stephen Irons wrote: > > I have implemented a Proj4js transformation for New Zealand Map Grid > > (NZMG) co-ordinates (EPSG:27200). spatial-reference.org > > <http://spatial-reference.org> gives a description of the > > transformation, but the '+proj=nzmg' was not available in the current > > version in the repository. This projection is not related to any of > > the existing types, so I implemented it. > > > > I would like to contribute this code to Proj4js. However, it is not > > obvious how to submit this code to the project. Can anyone here point > > me to the right place? > > > > Stephen Irons > > > > > > Background > > > > New Zealand Map Grid (NZMG) is a projection used to convert latitude > > and longitude to easting and northing coordinates in metres. It was > > designed to minimize the scale error over the land area of New Zealand > > and cannot be used elsewhere. > > > > The New Zealand govnernment survey agency, LINZ (Land Information New > > Zealand) has published two series of maps covering the mainland areas > > of New Zealand. > > > > * 262-series is 1:250000 > > * 260-series is 1:50000 > > > > These maps are available in printed form and are currently the only > > large-scale maps of New Zealand widely available to the general > > public. Vector data is also available. > > > > Various commercial concerns have scanned these maps, or generated > > tiles from the vector data, and released products using these tiles. I > > have one of these products and want to use the tiles with OpenLayers. > > > > New Zealand Map Grid > > > > New Zealand Map Grid was designed by Dr W. I. Reilly in 1973. Its > > official specification is published as /New Zealand Map Grid/, > > Department of Lands and Survey Technical Circular 1973/32. A scanned > > image of the publication is available at > > http://www.linz.govt.nz/docs/miscellaneous/nz-map-definition.pdf > > > > It is also described in /Conversion between Latitude and Longitude and > > New Zealand Map Grid/, OSG Technical Report 4.1, 1998. This document > > is available at http://www.linz.govt.nz/docs/miscellaneous/nzmg.pdf > > > > NZMG is given EPSG code EPSG:27200. It is defined at > > http://spatialreference.org/ref/epsg/27200/proj4/ as > > > > * "+proj=nzmg +lat_0=-41 +lon_0=173 +x_0=2510000 +y_0=6023150 > > +ellps=intl +datum=nzgd49 +units=m +no_defs" > > > > Now, most of this is known to Proj4js code. However, the projections > > 'nzmg' is not know, and needs to be implemented. > > > > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > Dev mailing list > > [email protected] > > http://openlayers.org/mailman/listinfo/dev > > >
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