[OpenLayers-Users] Questions: Projections, Google, Yahoo, etc

[Jon Blower]

Hi Stephen,

My WMS server is home-made: it's a fairly complete WMS 1.3.0
implementation but not quite ready for full release.  You can find
details (plus an alpha version) at
http://www.resc.rdg.ac.uk/trac/ncWMS/.  It's designed specifically for
fast creation of maps from NetCDF data, particularly ocean forecast
data.  It's deployed at
http://lovejoy.nerc-essc.ac.uk:8080/ncWMS/WMS.py? and there's an
OpenLayers interface at
http://lovejoy.nerc-essc.ac.uk:8080/ncWMS/godiva2.html.

Just by way of example, here's a URL for a Plate Carree (standard
lat-lon) image:

http://lovejoy.nerc-essc.ac.uk:8080/ncWMS/WMS.py?LAYERS=waves/wind_dir&ELEVATION=0&TIME=2006-12-30T00:00Z&TRANSPARENT=true&SCALE=0.000000,360.000000&OPACITY=100&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&STYLES=&EXCEPTIONS=XML&FORMAT=image/png&CRS=CRS:84&BBOX=-11.9,48.0,12.9,62.9&WIDTH=256&HEIGHT=256.

Here's the same thing in Mercator: note that the bounding box is the
same (i.e. expressed in decimal degrees) but the projection has
changed to EPSG:41001:

http://lovejoy.nerc-essc.ac.uk:8080/ncWMS/WMS.py?LAYERS=waves/wind_dir&ELEVATION=0&TIME=2006-12-30T00:00Z&TRANSPARENT=true&SCALE=0.000000,360.000000&OPACITY=100&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&STYLES=&EXCEPTIONS=XML&FORMAT=image/png&CRS=EPSG:41001&BBOX=-11.9,48.0,12.9,62.9&WIDTH=256&HEIGHT=256

The images are very similar but the Mercator image is squashed at the
bottom and expanded at the top.