Transformation from WGS84 to NamBessel2217 (Namibia)

[LeroyDu_Plessis]

I want to project a raster from WGS84 Geographic to NameBessel2217 which is the projected coordinate system used in Namibia.

The problem i have however is that there are a entire list of possible transformations and i am uncertain which to use.

Can anyone offer any advice on which transformation to pick?

Thanks

[MelitaKennedy]

I want to project a raster from WGS84 Geographic to NameBessel2217 which is the projected coordinate system used in Namibia.

The problem i have however is that there are a entire list of possible transformations and i am uncertain which to use.

Can anyone offer any advice on which transformation to pick?

Thanks

Hi,

Can you give the details on the target coordinate system? Bessel is a spheroid (ellipsoid), not a datum.

EPSG (http://www.epsg.org and http://www.epsg-registry.org - online version is running slowly right now; the subcommittee is working on the problem) only lists Schwarzeck (although the Cape and Hartebeesthoek probably also apply, but they don't use Bessel ellipsoid) which does use Bessel Namibia. The transformation to use would be Schwarzeck_To_WGS_1984_2.

We have a UTM zone based on Schwarzeck. Otherwise, EPSG lists several zones based on Lo22. These use a south-west oriented system that we don't support. I've been told that you can emulate the Lo systems, by using -1 for the scale factor.

Melita