[Proj] Define custom proj4 CRS

[Andre Joost]

Am 31.01.2013 19:53, schrieb Hermann Peifer:

>
> However, as Stephane mentioned: the units of IBGE's DGN files are in km,
> so one has to define a custom CRS with these parameters (same as above
> with the exception of +units=km)
>
> +proj=utm +zone=23 +south +ellps=intl +towgs84=-206,172,-6,0,0,0,0 +units=km
>

Reading a proj document from Frank Warmerdam of 2004, I found this hint:
+proj=utm +zone=23 +south +ellps=intl 
+towgs84=-0.206,0.172,-0.006,0,0,0,0 +to_meter=1000 +no_defs

which works perfectly in Qgis.

HTH,
André Joost