John: (!)
RE: http://www.remotesensing.org/geotiff/proj_list/geos.html That reference is not correct. (2) RE: is geostationary a special case of vertical perspective? I don’t think of geostationary as being special case of vertical perspective, but if the center of the image is at the equator, there are similarities. My opinion … treat them as distinctly different. very respectfully, randy On Nov 19, 2014, at 3:45 PM, John Caron <ca...@ucar.edu> wrote: > great, thanks for the clarification. > > the reference in CF vertical perspective projections has this proj4 reference: > > http://www.remotesensing.org/geotiff/proj_list/geos.html > > is it wrong/misleading? > > is geostationary a special case of vertical perspective? > > On Tue, Nov 18, 2014 at 6:28 PM, Randy Horne <rho...@excaliburlabs.com> wrote: > John: > > geostationary projection and vertical perspective projections are not the > same. > > an example of a vertical projection image is one taken by a camera in space, > which is not necessarily at the equator, and the data for the entire image is > observed using a single exposure. > > the geostationary projection is that associated with scanning imagers from > geostationary orbit where each image pixel covers a fixed number of > radians/degrees in east/west and north/south relative to the camera’s > aperture. > > very respectfully, > > randy > > > > On Nov 18, 2014, at 3:19 PM, John Caron <ca...@ucar.edu> wrote: > >> CF TRAC ticket 72 defines "geostationary projection", accepted for 1.7. >> >> 1) I _think_ that "Vertical Perspective" is an earlier version of this, and >> it should be deprecated in favor of "geostationary". Does anyone have a >> different opinion? >> >> 2) The draft 1.7 does not yet include it, so its been hard to refer users to >> it. >> >> http://cfconventions.org/Data/cf-conventions/cf-conventions-1.7/build/cf-conventions.html#appendix-grid-mappings >> _______________________________________________ >> CF-metadata mailing list >> CF-metadata@cgd.ucar.edu >> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > > > ____________________________________ > > Randy C. Horne (rho...@excaliburlabs.com) > Principal Engineer, Excalibur Laboratories Inc. > voice & fax: (321) 952.5100 > url: http://www.excaliburlabs.com > > > > > ____________________________________ Randy C. Horne (rho...@excaliburlabs.com) Principal Engineer, Excalibur Laboratories Inc. voice & fax: (321) 952.5100 url: http://www.excaliburlabs.com
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