[OSRS-PROJ] SOM-A

[Gerald Evenden]

Space obl.. merc is in PROJ.4, basically a copy of gctp.

+proj=lsat

On Jan 23, 2004, at 3:04 PM, Frank Warmerdam wrote:

> Folks,
>
> Some folks from JPL are interested in having SOM-A added to GeoTIFF.
> However, the arguments they propose for it are not ones that I am  
> familiar
> with and I wonder how practical they would be to use.  Does anyone  
> know if
> PROJ.4 supports Space Oblique Mercator (specially form-A from GCTP)?
> Would anyone be interested in implementing it?
>
> The JPL proposal looks like this:
>
> Michael A. Bull wrote:
> > To all,
> >
> > I would like to see support added for the Space Oblique Mercator  
> (SOM) projection in
> > GeoTiff.  Specifically, I'm interested in the generic SOM format A,  
> as defined by GCTP,
> > and also is implemented in ENVI version 4.0.  The parameters  
> required to define the
> > SOM format A projection are as follows:
> >
> > 1 Semi-major axis of the ellipsoid
> > 2 Semi-minor axis of the ellipsoid
> > 3 Inclination of orbit ascending node.  (angular units)
> > 4 Longitude of ascending orbit at equator.  (angular units)
> > 5 False easting
> > 6 False northing
> > 7 Period of satellite revolution.  (time in minutes)
> > 8 Satellite ratio.  This controls the start and end points of the  
> map on
> >    the earth surface.
> >
> > I propose that a new projection type be added along with keys for the
> > projection parameter types that are not already supported.
> >
> > Following existing convention, I suggest the projection type should  
> be named
> > CT_ObliqueMercator_Space_A
> >
> > New projection parameter keys are needed for parameters 3,4,7 and 8  
> (above).,
> > The other parameters already have appropriate keys defined.   
> Suggested new
> > parameter type names are
> > 3 ProjInclinationAscending
> > 4 ProjLongitudeAscending
> > 7 ProjOrbitPeriod
> > 8 ProjSatelliteRatio
>
> Best regards,
> --  
> --------------------------------------- 
> +--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam,  
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Programmer for Rent
>
>
> ----------------------------------------
> PROJ.4 Discussion List
> See http://www.remotesensing.org/proj for subscription, unsubscription
> and other information.
>
>
_____________________________________
Jerry and the low riders: Daisy Mae and Joshua

----------------------------------------
PROJ.4 Discussion List
See http://www.remotesensing.org/proj for subscription, unsubscription
and other information.