[Proj] looking for the right params for RSO
Christoph Dohmen
ChDohmen at gmx.de
Fri Aug 27 01:57:14 EST 2010
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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