Feature request #9352

update 7 parameter transformation fir Israel ITM grid

Added by Michael Davis over 6 years ago. Updated about 1 year 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 6 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 about 6 years ago

  • Category set to Projection Support

#3 Updated by Giovanni Manghi over 3 years ago

  • Easy fix? set to No

#4 Updated by Nyall Dawson about 1 year 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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