[Proj] different params for "Kertau_RSO_Malaya_Meters" found

[Christoph Dohmen]

Hi list,

I got some data which report the "Kertau_RSO_Malaya_Meters" as coordinatesystem. But I'm not sure how to deal with those data
because the epsg-file from trunk defines this as:

<3168> +proj=omerc +lat_0=4 +lonc=102.25 +alpha=323.0257905 +k=0.99984 +x_0=804670.24 +y_0=0 +gamma=323.1301023611111 +a=6377295.664 +b=6356094.667915204 +units=m +no_defs  <>

and from spatialreference.org I found the following projection 6792:

PROJCS["Kertau_RSO_Malaya_Meters",
    GEOGCS["GCS_Kertau",
        DATUM["D_Kertau",
            SPHEROID["Everest_1830_Modified",6377304.063,300.8017]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Rectified_Skew_Orthomorphic_Natural_Origin"],
    PARAMETER["False_Easting",804671.299775],
    PARAMETER["False_Northing",0.0],
    PARAMETER["Scale_Factor",0.99984],
    PARAMETER["Azimuth",-36.97420943711801],
    PARAMETER["Longitude_Of_Center",102.25],
    PARAMETER["Latitude_Of_Center",4.0],
    PARAMETER["XY_Plane_Rotation",-36.86989764584402],
    UNIT["Meter",1.0]]

The differences are the spheroid-parameter and false easting. Getting
the wkt-projection from the data shows up that these are using the 
second one.

Can anyone outthere describe what's the difference between those two
projections? Will the second one be integrated into the epsg file?

And another question, are there any ideas concerning when to release 
proj 4.8.0?

Best regards

Christoph
-- 
GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT!
Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01