Details Ticket 5396


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Serial Number 5396
Subject hermannskogel datum parameters for Slovakia
Area grass6
Queue grass
Requestors hofierka@geomodel.sk
Owner mlanda
Status resolved
Last User Contact Fri Dec 22 10:03:17 2006 (2 yr ago)
Current Priority 30
Final Priority 70
Due No date assigned
Last Action Fri Dec 22 10:03:17 2006 (2 yr ago)
Created Mon Dec 18 13:40:30 2006 (2 yr ago)

Transaction History Ticket 5396


Mon, Dec 18 2006 13:40:30    Request created by guest  
Subject: hermannskogel  datum parameters for Slovakia

Platform: GNU/Linux/x86
grass obtained from: Trento Italy site
grass binary for platform: Compiled from Sources

Hermannskogel datum parameters for Slovakia (Krovak projection) are wrong. The
estimated error for these parameters is about 120-130 m.
Unless proper parameters are available I suggest to use parameters for Czech
republic which give acceptable results with 1-3 meter error.
The item for Slovakia should be removed from menu and item for Czech republic
(1.) could be extended to include also Slovakia.
The evaluation was done using local cartographic tools (Samuel for ArcView and
Dattra).
Wed, Dec 20 2006 22:05:01    Owner changed to mlanda by mneteler  
Wed, Dec 20 2006 22:05:01    Mail sent by mneteler  
(msg from Jaro):

I contacted a responsible person from the Geodetic and Cartographic
Institute in Slovakia and he sent me much better paramaters that are
appropriate for GRASS (or generally for any GIS). It might be
interesting that the same incorrect parameters uses also ArcGIS.

So now it is again possible to provide a single item for Slovakia in
hermannskogel menu with these parameters. They just wanted to mention
that the parameters came from the institute (this is in fact very
useful, because then everyone knows the source).

Jaro

---

Thanks to Dr. Klobusiak from the national Geodetic and Cartographic
Institute Bratislava, we've got the following correct parameters for
Slovakia:

datumparams: towgs84=485.021,169.465,483.839,7.786342,4.397554,4.102655,0

These parameters are recommended by this Institute. If possible please
include the following note in the appropriate source code line:
"These parameters for Slovak S-JTSK coordinate system were recommended
by the Geodetic and Cartographic Institute Bratislava in 19/12/2006,
http://www.gku.sk"
The parameter errors reported by P. Paudits are between 0.48 to 2.11 m
(average 1.21 m). In case of JTSK/03 the errors should be within few cm
or dm.
Thanks.
Thu, Dec 21 2006 15:09:07    Mail sent by msieczka  
Hi

This seems to have been fixed in recent days in CVS. Do you confirm?

Thanks.

Maciek
Fri, Dec 22 2006 10:03:17    Status changed to resolved by msieczka  
Fri, Dec 22 2006 10:03:17    Mail sent by msieczka  
I'm pretty sure it is fixed. Otherwise please re-open. Closing it.

Maciek
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