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[FreeGeoCZ] problemy s transformaciou medzi ll a sjtsk


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  • From: vojtko AT fns.uniba.sk
  • To: freegeocz AT fsv.cvut.cz
  • Subject: [FreeGeoCZ] problemy s transformaciou medzi ll a sjtsk
  • Date: Sat, 20 Sep 2008 14:07:09 +0200 (CEST)
  • Importance: Normal
  • List-archive: <http://mailman.fsv.cvut.cz/pipermail/freegeocz>
  • List-id: Svobodná geoinformační infrastruktura <freegeocz.fsv.cvut.cz>

Zdravim,

Mam dva problemy a potrebujem pomoc :-(

1) potreboval by som poradit s transformaciu objektov z lat/long location
to sjtsk location. Neviem sa ubranit dojmu, ze to v GRASSe nepracuje uplne
korektne. Osobne si myslim, ako keby odignoroval transformacne parametre
pre SR, konkretne riadok "towgs84 :
485.021,169.465,483.839,7.786342,4.397554,4.102655,0" Mam nastavene
nasledujuce locations:

A) Lat/Long
GRASS 6.3.0 (LL_SK):~ > g.proj -p
-PROJ_INFO-------------------------------------------------
name : Latitude-Longitude
proj : ll
ellps : wgs84
-PROJ_UNITS------------------------------------------------
unit : degree
units : degrees
meters : 1.0


B) sjtsk (pre SR)
GRASS 6.3.0 (sjtsk):~ > g.proj -p
-PROJ_INFO-------------------------------------------------
name : Krovak
proj : krovak
datum : hermannskogel
ellps : bessel
lat_0 : 49.5
lon_0 : 42.5
alpha : 30.28813972222222
k : 0.9999
x_0 : 0
y_0 : 0
pm : ferro
no_defs : defined
towgs84 : 485.021,169.465,483.839,7.786342,4.397554,4.102655,0
-PROJ_UNITS------------------------------------------------
unit : metre
units : metres
meters : 1

po transformacii bodov z lat/long nepadnu tam kam maju v sjtsk.

napr. bod 1: 20.101033 48.775033 >> -347435.70465381 -1229109.69395328 v
GRASSe

ale cez skript nasledovny skript za pouzitia cs2cs je vysledok iny,
nastastie spravny :-)

echo "20.101033 48.775033" | cs2cs +proj=latlong +datum=WGS84 \
+to +proj=krovak +ellps=bessel +no_defs \
+towgs84=485.021,169.465,483.839,7.786342,4.397554,4.102655,0
vysledok: -347409.19 -1228908.86 -0.02

pouzivam: Ubuntu Hardy Heron
Grass, je instalovany z Les-ejk repozitarov

2) nie je mozne na mojom PC skombinovat QGIS a GRASS, pretoze nenacita
grass plugin do QGIS. Skusal som uz aj nemozne, ale stale to skoncilo s
velmi deprimujucou hlaskou:
ERROR 1: libgrass_I.so: cannot open shared object file: No such file or
directory
ERROR 1: libgrass_I.so: cannot open shared object file: No such file or
directory

Qgis som skusal aj z les-ejk aj z http://ppa.launchpad.net/qgis/ubuntu

naistalovane mam GRASS 6.3 a QGIS 0.11.0

Vopred dakujem o akukolvek pomoc a dufam, ze som problem opisal dostatocne
...

Rasto

--
Rastislav Vojtko
Dept. Geology & Palaeontology
Faculty of Natural Sciences
Comenius University
Mlynska dolina G
SK-842 15 Bratislava
The Slovak Republic





  • [FreeGeoCZ] problemy s transformaciou medzi ll a sjtsk, vojtko, 09/20/2008

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