[Qgis-user] transformation

[b.j.kobben at utwente.nl]

Hi Goran,

The reason is (almost certainly) the fact that the two CRSs (coordinate
reference system)s use a different Datum, which I suppose is the case,
because in the Proj4 description you provide they have a different
ellipsoid (The Bessel ellipsoid versus GRS80). Unfortunately, for the
datum-transformation to be included when transforming from one CRS to
another, you need to provide QGIS (actually the underlying Proj4 library)
with details about that, and they seem to be missing. I cannot know which
datum transformation is needed, maybe ask your Croatia mapping
agency/Survey departement or Google for "datum transformation HR_GK_6 to
HTRS96/TM"...

Barend 

--
Barend Köbben
Senior Lecturer – ITC-University of Twente
PO Box 217, 7500 AE Enschede (Netherlands)
@barendkobben




On 23-02-15 13:57, "Goran Pavic" <goran_pavic at yahoo.com> wrote:

>Recently, in Croatia we must use new official reference coordinate system
>for map projection HTRS96/TM. All data I used before are in
>
>HR_GK_6 projection.
>
>
>I'm interested how to make transformation of shapefiles which I have in
>HR_GK_6 projection into new one HTRS96/Croatia TM projection?
>
>HR_GK_6 - +proj=tmerc +lat_0=0 +lon_0=18 +k=0.9999 +x_0=6500000 +y_0=0
>+ellps=bessel +units=m +no_defs
>HTRS96/Croatia TM - +proj=tmerc +lat_0=0 +lon_0=16.5 +k=0.9999
>+x_0=500000 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs
>
>
>
>I tried with on-the-fly CRS transformation but my data didn't "landed" on
>the right place. All data get a shift
>?x=397,85 m and ?y=22,25 m
>
>
>I'm using qgis 2.6 and windows OS
> 
>Goran Pavic
>
>Papuk Geopark
>
>Stjepana Radica 46, 34330 Velika, Croatia
>
>T: 0038534313030,
>F: 0038534313027, E:
>papukgeopark at gmail.com <mailto:papukgeopark at gmail.com>
>
>www.papukgeopark.com <http://www.papukgeopark.com/index.php?lang=en>
>
>
>FOLLOW US:  
> <https://plus.google.com/+PapukNatureParkUNESCOglobalGeoparkVelika/posts>
>   
> <https://www.facebook.com/pages/Park-prirode-Papuk/92110443323>
>   
>
> <https://twitter.com/Papuk_Geopark>
> <https://twitter.com/Papuk_Geopark>
>