Mon, Dec 18 2006
13:40:30
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Request created by guest
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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).
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Wed, Dec 20 2006
22:05:01
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Owner changed to mlanda by mneteler
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Wed, Dec 20 2006
22:05:01
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Mail sent by mneteler
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(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.
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Thu, Dec 21 2006
15:09:07
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Mail sent by msieczka
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Hi
This seems to have been fixed in recent days in CVS. Do you confirm?
Thanks.
Maciek
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Fri, Dec 22 2006
10:03:17
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Status changed to resolved by msieczka
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Fri, Dec 22 2006
10:03:17
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Mail sent by msieczka
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I'm pretty sure it is fixed. Otherwise please re-open. Closing it.
Maciek
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