[Qgis-user] bessel ellipsoid 1841

[G. Allegri]

It's quite unlikely that an earth centred datum has been used for your map,
and the 4004 should only be used when the datum is unkonwn and we suppose
that the ellipsoid origin is the earth centre... yet I don't know what the
geodetic reference(s) was used in Germany along the 19th century.

giovanni



2011/9/26 Torsten Lange <tlange at gwdg.de>

> Hello,
>
> I have a historical map from 1855 from the Muensterland Basin, Germany. The
> map shows geographic coordinates, thus my colleague said most likely it's
> Bessel 1841 ellipsoid.
>
> QGis offers:
> Unknown datum based upon the Bessel 1841 ellipsoid EPSG:4004
> +proj=longlat +ellps=bessel +no_defs
>
> Why there is no datum? Shouldn't there be one?
>
> Thank you, Torsten
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20110926/51ac5b38/attachment.html>