Re: Map Projection: Satellite versus Orthographic

Hi Bruce,

The Satellite projection is a perspective view from space that
requires more parameters to fully
specify. The resources mpSatelliteAngle1F, mpSatelliteAngle2F and
mpSatelliteDistF apply only to
the Satellite projection. Given the default settings of these
parameters, you are correct that the Satellite
projection defaults to an Orthographic projection.

The Orthographic projection is essentially a limiting case of the
Satellite view where the
distance is theoretically infinite.

You can find a more detailed discussion of these projections and the
parameters in the documentation of the
low level Fortran package that NCL relies on at:

http://ngwww.ucar.edu/ngdoc/ng4.4/supplements/ezmap/
#AzimuthalProjections

  -dave

On Oct 12, 2007, at 12:59 PM, Lunde, Bruce N CIV NAVOCEANO, NP1 wrote:

> Hello,
>
> Is there any difference between the
> Satellite and Orthographic projections ?
>
> Thanks, Bruce
>
> =====
> Bruce Lunde
> Bruce.Lunde_at_navy.mil
> 228-688-5843
> Code NP1
> Naval Oceanographic Office
> Stennis Space Center, MS
> =====
> _______________________________________________
> ncl-talk mailing list
> ncl-talk_at_ucar.edu
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Received on Fri Oct 12 2007 - 13:33:35 MDT