Just to chip in - Google Earth uses imagery in Plate Carree (plain old lat-lon) projection. Google Maps, Yahoo Maps and some others use a Spherical Mercator projection (i.e. Mercator with a spherical earth). Anyway, since these are visualization tools I don't think they need influence CF as a _data_ convention.
Cheers, Jon On Wed, May 21, 2008 at 12:05 PM, Don Murray <[EMAIL PROTECTED]> wrote: > Phil/Ethan- > > Philip Bentley wrote: > >> An obvious one perhaps, but one which we may find increasingly useful / >> relevant in light of the rise and rise of GoogleEarth-type applications, >> is the Orthographic projection. This being the classic 'view from space' >> projection. >> >> Same grid mapping parameters as the other azimuthal projections, viz. >> >> grid_mapping_name = "orthographic" >> >> longitude_of_projection_origin >> latitude_of_projection_origin >> false_easting >> false_northing >> >> (though off the top of my head I can't think of a scenario where one >> would want to use the last two params). > > I think GE actually uses a tilted perspective view. But, > I think CF should support the Vertical Perspective with > an ellipsoid. EUMETSAT has GRIB messages with this projection > and an elliptical earth. > > Don > ************************************************************* > Don Murray UCAR Unidata Program > [EMAIL PROTECTED] P.O. Box 3000 > (303) 497-8628 Boulder, CO 80307 > http://www.unidata.ucar.edu/staff/donm > ************************************************************* > > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > -- -------------------------------------------------------------- Dr Jon Blower Tel: +44 118 378 5213 (direct line) Technical Director Tel: +44 118 378 8741 (ESSC) Reading e-Science Centre Fax: +44 118 378 6413 ESSC Email: [EMAIL PROTECTED] University of Reading 3 Earley Gate Reading RG6 6AL, UK -------------------------------------------------------------- _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
