Re: [FreeGeoCZ] Fwd: [GRASS-dev] [bug #5396] (grass) hermannskogel datum parameters for Slovakia

["Peter Paudits" <paudits AT gssr.sk>]

Nastavenie towgs pre SK v grasse je chybne. Ako pise dolu v bugliste,
chyba je 120 - 130 m oproti programu Samuel pre AV. Tento bug tam
pretrvava od verzie 5.0.3 a bolo by dobre ho odstranit a nechat jedno
spolocne nastavenie pre CZ aj SK.

Preto Slovaci pouzivajte nastavenie towgs pre Czech, chyba oproti
Samuelovi je 1 - 3 m. PROJ_INFO by malo vyzerat takto:

name: Krovak
datum: hermannskogel
towgs84: 570.8,85.7,462.8,4.998,1.587,5.261,3.56
proj: krovak
ellps: bessel
a: 6377397.1550000003
es: 0.0066743722
f: 299.1528128000
[ppaudits@ppaudits PERMANENT]$

P.

On 18/12/06, Martin Landa <landa.martin AT gmail.com> wrote:
> Zdravim, preposilam GRASS bug ticket, aktualni stav v GRASS-CVS:
>
> hermannskogel "towgs84=570.8,85.7,462.8,4.998,1.587,5.261,3.56" "Czech
> Republic" " "
> hermannskogel "towgs84=559.0,68.7,451.5,7.920,4.073,4.251,5.71" "Slovakia" " "
>
> Porovnam-li s parametry z GRASSwikiCZ -- nejsem si jisty, jake hodnoty
> parametru pro SR pouzit...
>
> Pro SR:
>
> name: Krovak
> datumparams: towgs84=558.7,68.8,452.2,8.025,4.105,4.295,5.74
> proj: krovak
> ellps: bessel
>
> ?
>
> Martin
>
> ---------- Forwarded message ----------
> From: Request Tracker <grass-bugs AT intevation.de>
> Date: 18.12.2006 13:40
> Subject: [GRASS-dev] [bug #5396] (grass) hermannskogel datum
> parameters for Slovakia
> To: grass-dev AT grass.itc.it
>
>
> this bug's URL: http://intevation.de/rt/webrt?serial_num=5396
> -------------------------------------------------------------------------
>
> 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).
>
>
> -------------------------------------------- Managed by Request Tracker
>
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>
>
> --
> Martin Landa <landa.martin AT gmail.com> * http://gama.fsv.cvut.cz/~landa *
>
>
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--
Peter Paudits