Feature request #2705

Correct Transformation of MGI Austria Lambert to WGS 84 needed

Added by gmirzi - over 7 years ago. Updated 6 months ago.

Status:Open
Priority:Low
Assignee:-
Category:Projection Support
Pull Request or Patch supplied:No Resolution:
Easy fix?:No

Description

Hello,

I want to export a layer with MGI Austria Lambert (EPSG 31287) to WGS 84 (EPSG 4326) with fTools. The problem ist that the result has an x- and y-axis error of 100 meters or so because the transformation doesn't use the right parameters. For MGI to WGS 84 there are some different transformation methods but only MGI_To_WGS_1984_3 (EPSG 1618) is the one that is right and that is recommended by the official Austrian Institute BEV.

see also: http://img293.imageshack.us/img293/7675/transformation.png

and the correct parameters below:

Is it possible to change the parameters in QGIS transformation manually (user defined projection) or can you implement this function as a new transformation?
Thank you!

regards,
Philipp

using QGIS 1.5 under XP

1618 MGI_To_WGS_1984_3

GEOGTRANMGI_To_WGS_1984_3"GEOGCS["GCS_MGI"DATUM["D_MGI"SPHEROID["Bessel_1841"63773971552991528128PRIMEM["Greenwich"00]UNIT["Degree"00174532925199433]]GEOGCS["GCS_WGS_1984"DATUM["D_WGS_1984"SPHEROID["WGS_1984"63781370298257223563]]PRIMEM["Greenwich"00]UNIT["Degree"00174532925199433]]METHOD["Position_Vector"]PARAMETER["X_Axis_Translation"577326]PARAMETER["Y_Axis_Translation"90129]PARAMETER["Z_Axis_Translation"463919]PARAMETER["X_Axis_Rotation"5137]PARAMETER["Y_Axis_Rotation"1474]PARAMETER["Z_Axis_Rotation"5297]PARAMETER["Scale_Difference]]

Source:
http://gullhver.os.is/website/ArcXML_Guide/Support_files/elements/dattrans.htm

History

#1 Updated by Giovanni Manghi over 7 years ago

Just add a custom reference system in your QGIS installation

#2 Updated by Paolo Cavallini over 7 years ago

If very widely used, this can be added to the projection internal DB

#3 Updated by Giovanni Manghi almost 6 years ago

  • Target version changed from Version 1.7.0 to Version 1.7.4

#4 Updated by Giovanni Manghi over 5 years ago

  • Target version changed from Version 1.7.4 to Version 2.0.0

#5 Updated by Pirmin Kalberer about 5 years ago

  • Target version changed from Version 2.0.0 to Future Release - Nice to have

#6 Updated by Anita Graser over 1 year ago

  • Assignee deleted (nobody -)
  • Operating System deleted (Windows)
  • OS version deleted (XP)
  • Pull Request or Patch supplied set to No

I think MGI Austria Lambert is now correct, current proj4 string is:

+proj=lcc +lat_1=49 +lat_2=46 +lat_0=47.5 +lon_0=13.33333333333333 +x_0=400000 +y_0=400000 +ellps=bessel +towgs84=577.326,90.129,463.919,5.137,1.474,5.297,2.4232 +units=m +no_defs

#7 Updated by Giovanni Manghi 6 months ago

  • Easy fix? set to No

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