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 <rhorne at 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 <caron at 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
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>
>
> ____________________________________
>
> Randy C. Horne (rhorne at excaliburlabs.com)
> Principal Engineer, Excalibur Laboratories Inc.
> voice & fax: (321) 952.5100
> url: http://www.excaliburlabs.com
>
>
>
>
>
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