Map Projection and Coordinate System Sites
Sunday, 3. January 2010, 22:02:05
A few days after the holidays, I had some time to revisit some specification documents. I had even considered posting a link to some of the work I've done using Yahoo! GeoPlanet, based on the GeoLocator comparison work that I said I'd be doing a few posts back. I've decided to not post it at this time since I've noticed a lot of bots attempting to access my http server and I'd like to check the logs before doing so.
In the meantime, I'm going to post a couple of cool links that some people might enjoy looking at. Equal Area Maps is a site that explains and shows map projections and explains coordinate systems. They've used OpenLayers to make the maps interactive. It is a pretty cool learning tool. Also, here is a web site that shows what coordinate systems are applicable for certain areas. It's called SpatialReference.org and it's used by the Proj.4 and GDAL libraries to query and obtain coordinate system information. (see the About page for more detail) Finally, there is an EPSG Registry that works similar to SpatialReference.org, but stores the coordinate system information as GML.
Here is a comparison of the New Brunswick EPSG:2953 coordinate system as served from two of the above registries as GML. A nice advantage to the SpatialReference.org site is that it supports more than just the GML representation.
http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::2953
http://www.spatialreference.org/ref/epsg/2953/gml/
I hope you'll find these sites useful, and if you know of any other useful sites, please let me know.





