[Qgis-user] QGIS GNSS NMEA Transformation Problem WGS84 to MGI Austria - vertical Gridshift in QField

[Peter Hartl]

Hello Roland,

thanks for reply!

We are using vertical datums transformation in QField, here 
Transformation in X, Y and Z from GNNS into our MGI with gridshift is 
working correkt!

Herzliche Grüße

Hartl Consulting e. U.
DI Peter Hartl MAS(GIS)
Gröben 11
A-6134 Vomp
Tel.: +43 660 17 42 228

office at hartl-consulting.at
www.hartl-consulting.at

Am 07.02.2025 um 13:42 schrieb Roland Spielhofer:
>
> Hi Peter,
>
> regarding your last point - are you aware of
> https://www.bev.gv.at/Services/Produkte/Grundlagenvermessung/Hoehen-Grid.html
> In recent versions QGIS has learned about vertical datums - I use 
> Höhen-Grid in our own processing workflow (not QGIS-related) for 
> transformation from ellipsoidal height to Höhe über Adria, but I think 
> it could work in QGIS as well.
> Grüße nach Tirol,
> Roland
> *Gesendet: *Freitag, 7. Februar 2025 um 07:11
> *Von: *"Peter Hartl via QGIS-User" <qgis-user at lists.osgeo.org>
> *An: *qgis-user at lists.osgeo.org
> *Betreff: *[Qgis-user] QGIS GNSS NMEA Transformation Problem WGS84 to 
> MGI Austria
>
> Hello QGIS Users,
>
> good morning from Winterwonderland Tirol in Austria!
>
> GNSS NMEA interpreted as WGS84 in QGIS can do transformation with 
> gridshift from ETRS89 to MGI, that is alredy working very good.
>
> +proj=pipeline +step +inv +proj=tmerc +lat_0=0 +lon_0=10.3333333333333 
> +k=1 +x_0=0 +y_0=-5000000 +ellps=bessel +step +proj=hgridshift 
> +grids=at_bev_AT_GIS_GRID_2021_09_28.tif +step +proj=utm +zone=32 
> +ellps=GRS80
>
> GNSS NMEA data interpreted as WGS84, viewing on map is ok, but saving 
> data in MGI (example 31254), default position_vector Transformation 
> makes  30 cm gap (parameters are ok, this was before gridshift exists)!
>
> +proj=pipeline +step +inv +proj=cart +ellps=WGS84 +step +proj=push 
> +v_3 +step +proj=cart +ellps=WGS84 +step +inv +proj=helmert +x=577.326 
> +y=90.129 +z=463.919 +rx=5.137 +ry=1.474 +rz=5.297 +s=2.4232 
> +convention=position_vector +step +inv +proj=cart +ellps=bessel +step 
> +proj=pop +v_3 +step +proj=tmerc +lat_0=0 +lon_0=10.3333333333333 +k=1 
> +x_0=0 +y_0=-5000000 +ellps=bessel
>
> *How can I make gridshift from WGS84 to MGI like ETRS89 to MGI?*
>
> *Does somebody know, is verticalshift working in QGIS (similar to 
> gridshift in X, Y)?*
>
> Herzliche Grüße
>
> Hartl Consulting e. U.
> DI Peter Hartl MAS(GIS)
> Gröben 11
> A-6134 Vomp
> Tel.: +43 660 17 42 228
>
> office at hartl-consulting.at
> www.hartl-consulting.at
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