[Proj] Help w/Timbalai 1948

[Mikael Rittri]

Oscar,
I agree, except that I used the old proj command instead of cs2cs, so I didn't
get any datum shift. 

But I can do

> cs2cs +init=epsg:4326 +to +init=epsg:29872 -f "%.3f"

114.4   4.175

1717442.731   1516073.010   -151.645

to perform the datum shift, too. Again, this agrees pretty well with your result,
but not exactly. 

By the way, the datum shift one gets from +init=epsg:29872 is the one EPSG calls
"Timbalai 1948 to WGS 84 (4)" or EPSG:1852, with accuracy 5 meters,
and Area of Use: East Malaysia - offshore South China Sea.  

Regards,

Mikael Rittri
Carmenta
Sweden
http://www.carmenta.com

28 jul 2012 kl. 13:22 skrev "OvV_HN" <ovv at hetnet.nl>:

> Re:
> 
> [Proj] Help w/Timbalai 1948
> Mikael Rittri Mikael.Rittri at carmenta.com
> Fri Jul 27 15:36:18 EST 2012
> 
> I tried the predefined instance of the latest Proj version, 4.8.0, like this 
> (where
> the -f stuff just gives more decimals):
> 
>> proj +init=epsg:29872 -f "%.3f"
> 
> 114.4   4.175
> 
> 1718563.021   1515793.018
> 
> This is nearly the same as Oscar van Vlijmen's result, except for about 5 
> millimeters.
> 
> ...........
> 
> Reply:
> 
> There still might be an explicable, but larger difference though.
> I assumed that the coordinates were on the Everest ellipsoid.
> An epsg:29872 init suggests however that the original coordinates could have 
> been on the wgs84 ellipsoid.
> In this init a datum transformation is defined and this will be executed if 
> a cs2cs is done, so I believe.
> I didn't do a datum transform.
> If the given lat,lon are on the WGS84 ellipsoid and a datum transform to 
> Timbalai 1948 is executed first, then the RSO coordinates will be (if I've 
> done everything correctly):
> 1717442.659, 1516072.998 sears feet.
> 
> Oscar van Vlijmen
> 
> 
> 
> 
> 
> 
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