[GRASS-dev] creating new location in krovak projection

[Jachym Cepicky]

hi Paul,

On Tue, Dec 05, 2006 at 10:32:40AM +0000, Paul Kelly wrote:
> Hello Jachym
> Those datum paramters are already in GRASS (and have been for several 
> years). The datum short name is hermannskogel, not that obvious and a bit 
> long, and not my choice but we can't change it now.
> 
> Interestingly the Slovak parameters are (very slightly) different from my 
> source - they must cover a slightly different part of the country or have a 
> different accuracy or something. This would need to be confirmed and 
> documented before adding them to the file. Hopefully the site you got them 
> from has some information?
> 
> Paul

these parameters are from Radim's old GRASS-Krovak page, we have just
copied those parameters from that page to our wiki.

This means, that we are all adding towgs84 parameter by hand since many
years, while we just could add hermannskogel datum :-( That is life.

Anyway, do you think, patch for 

general/g.setproj/proj-parms.table

is ok and can be applyed? It worked for me and for Martin, how desired.


Howto setup Location with Krovak projection could look like follows:

1 - Press "d" for "Other Projection"
2 - Specify "krovak" for projection name
3 - Press "y", that you want to specify gedetic datum for this location
4 - Choose "hermannskogel" from list of datum names
5 - Choose "2" for Czech republic or 3 for Slovak republic from list of
    avaliable parameter sets
6 - Plural form of units: meters
7 - Specify default region for your location

Does this look ok?

thank you

Jachym

> 
> On Fri, 1 Dec 2006, Jachym Cepicky wrote:
> 
> >hi,
> >together with Martin, we prepared this patch for 6.3. It itroduces new
> >geodetic datums for both - Czech and Slovak republic (previously, we had
> >to edit PROJ_INFO by hand and add "towgs84" parameter there).
> >
> >not sure, if this belongs to 6.2 too, but it would be nice to have it
> >there.
> >
> >Thanks
> >
> >Jachym
> >
> >On Tue, Nov 28, 2006 at 08:52:27PM +0100, Markus Neteler wrote:
> >>On Tue, Nov 28, 2006 at 08:42:54PM +0100, Jachym Cepicky wrote:
> >>>Hi,
> >>>I would like to define new Location using
> >>>
> >>>projection krovak
> >>>ellipsoid bessel
> >>>
> >>>when I come to question about projection, I specify "krovak" and hit
> >>>Return, GRASS jumps imidietly to DEFNE THE DEFAULT REGION form (for
> >>>defining boundary coordinates and resolution).
> >>>
> >>>When I try do specify new projection with g.setproj, it ends like this:
> >>>
> >>>GRASS 6.3.cvs (jtsk2):~ > g.setproj
> >>>
> >>>
> >>>Please specify projection name
> >>>Enter 'list' for the list of available projections
> >>>Hit RETURN to cancel request
> >>>>krovak
> >>>ERROR: Projection krovak is not specified in the table
> >>>GRASS 6.3.cvs (jtsk2):~ >
> >>>
> >>>
> >>>Howto define location using krovak projection?
> >>
> >>Hi Jachym:
> >>
> >>the Krovak projection is missing from:
> >>general/g.setproj/proj-parms.table
> >>
> >>I don't know how to add it there. It would be good to get
> >> general/g.setproj/README
> >>updated on how to add more projections.
> >>
> >>Markus
> >>
> >>_______________________________________________
> >>grass-dev mailing list
> >>grass-dev at grass.itc.it
> >>http://grass.itc.it/mailman/listinfo/grass-dev
> >
> >-- 
> >Jachym Cepicky
> >e-mail: jachym.cepicky at centrum.cz
> >URL: http://les-ejk.cz
> >GPG: http://www.les-ejk.cz/pgp/jachym_cepicky-gpg.pub
> >-----------------------------------------
> >OFFICE:
> >Department of Geoinformation Technologies
> >Zemedelska 3
> >613 00, Brno
> >Czech Republick
> >e-mail: xcepicky at node.mendelu.cz
> >URL:    http://mapserver.mendelu.cz
> >Tel.:   +420 545 134 514
> >

-- 
Jachym Cepicky
e-mail: jachym.cepicky at centrum.cz
URL: http://les-ejk.cz
GPG: http://www.les-ejk.cz/pgp/jachym_cepicky-gpg.pub
-----------------------------------------   
OFFICE:                                     
Department of Geoinformation Technologies 
Zemedelska 3
613 00, Brno
Czech Republick
e-mail: xcepicky at node.mendelu.cz
URL:    http://mapserver.mendelu.cz
Tel.:   +420 545 134 514
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