[GRASS-user] Need help for VN 2000, Vietnam Projection System

[G. Allegri]

Thanks Mike. I know the parameters of the system (they're in the epsg db
too)  but the problem is that we found translations slightly unprecise also
for a normal use. Anyway, we're working with high precision gps surveying
too, so we need dx dy, etc. parameters.

Giovanni

2006/12/5, Michael Perdue <michael_perdue at yahoo.ca>:
>
> Hi Giovanni,
>
> From what I know of the VN2000 coordinates system, it is a UTM projection
> with a WGS84 refrence ellipsoid. I don't know whether the datum is slightly
> skewed from Geocentric like the NAD83 datum is, but the translations (and
> rotations) should be small so you probably won't need them unless your
> performing high precision geodetic surveys.
>
> Cheers,
>
> Mike
>
> *"G. Allegri" <giohappy at gmail.com>* wrote:
>
> I'm looking for tranformation parameters from VN 2000 projection to WGS84.
> Does anyone know them? The Vietnam Governement has a tool (Cerine) to do it,
> but doesn't easily release it.
> Thanks in advance.
>
> Giovanni A.
> University of Siena (Italy)
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