Feature request #9352

update 7 parameter transformation fir Israel ITM grid

Added by Michael Davis over 10 years ago. Updated almost 5 years ago.

Status:Closed
Priority:Normal
Assignee:-
Category:Projection Support
Pull Request or Patch supplied:No Resolution:up/downstream
Easy fix?:No Copied to github as #:17954

Description

Please update +towgs84 parameter for the Israel ITM grid (EPSG:2039).
The 7 parameter transformation is officially published at the Israel mapping service:
http://www.mapi.gov.il/AboutUs/NewsAndUpdates/Documents/IGD.pdf

These are the parameters from WGS to Israel grid so for +towgs84 I guess we need to change the sign of the parameters shown below:

X -24.0024 m
Y -17.1032 m
Z -17.8444 m

Rotation

RX -0.0000016003 rad= -0."33009
RY -0.0000089821 rad= -1."85269
RZ 0.0000080949 rad= 1."66969

Scale Factor

m =1.0000054248 =5.4248 PPM

History

#1 Updated by Andre Joost over 10 years ago

This should be reported to the Proj4 bug tracker, because QGIS takes all CRS from there.

Proj4 only uses valid EPSG transformations, and EPSG only knows EPSG::1073 with 3 parameters.

http://www.epsg-registry.org/ notes:

Remarks:
For more accurate transformation contact Survey of Israel.

So you will have to convince EPSG to make a Revision according to the official 7-parameters you found in the document, then Proj will adopt these, and QGIS will follow.

#2 Updated by Paolo Cavallini almost 10 years ago

  • Category set to Projection Support

#3 Updated by Giovanni Manghi almost 7 years ago

  • Easy fix? set to No

#4 Updated by Nyall Dawson almost 5 years ago

  • Resolution set to up/downstream
  • Status changed from Open to Closed
  • Description updated (diff)

With QGIS 3.8 and the release of proj 6 library, any remaining projection definition related issues now should be filed with the proj project.

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