[Proj] Ukraine towgs84

[Maciek Sieczka]

On śro, 2005-12-07 at 14:53 +0100, Nicolai, Roel R SIEP-EPT-SCIG wrote:
> Maciek,
> 
> Cliff Mugnier has pretty much given a complete explanation why the EPSG database contains no transformation parameters specifically for Ukraine.
> I work for Shell and can confirm that the secrecy of geodetic parameters in the entire former Soviet Union is a serious issue. When working there you need to get permission from the authorities (read Secret Service) to us any coordinate system. E.g even though we know the parameters for all the Gauss-Kruger projection zones we generally cannot use them there.
> For the same reason the EPSG database carries no transformation parameters for any of the coordinate systems in China.

Thanks Roel, Clifford and Oscar!

I should have expected the obscurity of Ukrainian towgs84 would be a
matter of secret service affairs.

I hope this will change sometime soon, especially that Ukraine wants to
be in Europe it seems. The situation was pretty much the same about 10
years ago in Poland.

> By the way, good work by Oscar van Vlijmen in identifiying that
> 7-parameter transformation!

Indeed, good shot. I should have checked it myself first, sorry!

I was wondering... My area of interest is at the Polish-Ukrainian-Slovak
border, the East Carpathians MAB reserve. See:
http://www2.unesco.org/mab/br/brdir/europe-n/Polandmap.htm
We are not going to lurk into Ukraine more than about 50 km in our GIS.
What would be the accuracy if I use Polish Pulkovo->WGS84 7par shift,
which is well known and very accurate for Poland, for the Ukrainian and
Slovak MAB parts as well? I would be happy to have about 1m.

Maciek


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