[Proj] looking for the right params for RSO

[Christoph Dohmen]

Hi list,

I'm searching for the right parameter set for RSO projected coordinates.

Given a dedicated point from google earth with lat-long = 100.563743E 5.389524N

Having a raster dataset with a projection set as the following:

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]]

Inside the dedicated point has the coordinates 286400m east 596700m north.

Now I want to set up a translation first via proj directly and later on 
for a gdal-warp to transform the rasterdataset.

I tried out the parameter:

cs2cs +init=epsg:4326 +to +proj=omerc +a=6377304.063 +rf=300.8017 +lat_0=4.0 +lonc=102.25 +alpha=323.025790562881987 +gamma=323.13010235415598 +k_0=0.99984 +x_0=804671.299775

but the result is 617824.69 153846.36

Using the other way round I used

cs2cs +proj=omerc +a=6377304.063 +rf=300.8017 +lat_0=4.0 +lonc=102.25 +alpha=323.025790562881987 +gamma=323.13010235415598 +k_0=0.99984 +x_0=804671.299775 +to +init=epsg:4326

With the input of 286400m east 596700m north I got 97d32'10.232"E  9d22'35.287"N.

Is there anyone who can give me any hint how to setup this
translation from "RSO Malay" to Lat-Long or UTM?

Some information for the background, I use the latest proj from
svn. The projection in can be found at http://spatialreference.org/ref/sr-org/6792/ but it seems that there is no comparable epsg-code :-(

thanks

Christoph
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