[gdal-dev] SCH support in GDAL

[Even Rouault]

Le dimanche 03 janvier 2016 00:54:41, Agram, Piyush S (334D) a écrit :
> Hi,
>    Spherical Cross-track Height (SCH) coordinate system support was added
> to PROJ.4 about a couple of months ago. This is widely used for processing
> radar remote sensing data, particularly for the NASA radar missions. I
> have tried to include support for this coordinate system in GDAL by
> defining new OGR SRS parameters.
> 
> 
> You can find the change log here:
> 
> https://github.com/piyushrpt/gdal/commit/7e8f3c56367689fd4048063a5d0e2cd15a
> 93293b

Technically looks good to me. Just for our information: are there raster 
formats handled by GDAL that will make use of this projection method ?

> 
> Example output of gdalsrsinfo look's like this:
> > gdalsrsinfo "+proj=sch +plat_0=30.3 +plon_0=45.1 +phdg_0=-12.2
> >
> >+datum=WGS84"
> 
> PROJ.4 : '+proj=sch +plat_0=30.3 +plon_0=45.1 +phdg_0=-12.2 +h_0=0
> +datum=WGS84 +units=m +no_defs '
> 
> OGC WKT :
> PROJCS["unnamed",
> 	GEOGCS["WGS 84",
> 		DATUM["WGS_1984",
> 			SPHEROID["WGS 84",6378137,298.257223563,
> 				AUTHORITY["EPSG","7030"]],
> 			AUTHORITY["EPSG","6326"]],
> 		PRIMEM["Greenwich",0,
> 			AUTHORITY["EPSG","8901"]],
> 		UNIT["degree",0.0174532925199433,
> 			AUTHORITY["EPSG","9122"]],
> 		AUTHORITY["EPSG","4326"]],
> 	PROJECTION["Spherical_Cross_Track_Height"],
> 	PARAMETER["peg_point_latitude",30.3],
> 	PARAMETER["peg_point_longitude",45.1],
> 	PARAMETER["peg_point_heading",-12.2],
> 	PARAMETER["peg_point_height",0]]
> 
> 
> 
> This is my first time working with OGR parameters. Any comments/
> suggestions for improvements are welcome.
> I hope to issue a pull request once the changes conform with established
> conventions.
> 
> Thanks
> Piyush
> 
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