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NGO48 (EPSG:4273) to ETRS89 (EPSG:4258) triangulation-based transformation #2554

merged 11 commits into from Mar 10, 2021


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@himsve himsve commented Mar 4, 2021

NGO48 (EPSG:4273) to ETRS89 (EPSG:4258) triangulation-based transformation.

The transformation is based on the TIN-json file 'no_kv_ETRS89NO_NGO48_TIN.json'. The transformation in mentioned TIN-file has the direction EPSG:4258>EPSG:4273.

The transformation EPSG:4273>EPSG:4258 is already defined as EPSG:1653 at as a Position Vector transformation (EPSG:9606). The triangulation-based NGO48>ETRS89 transformation is not yet registered with new EPSG code due to that triangulation-based transformation is not registered as method at

Preliminary the EPSG:4273>EPSG:4258 triangulation-based transformation is implemented as encapsulated proj string in other_tranformation.

This pull request is related to #OSGeo/PROJ-data#60

  • Tests added. GIE test EPSG:4258>EPSG:27393.
  • Added clear title that can be used to generate release notes
  • Resource file added to
  • EPSG code registration

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himsve and others added 5 commits March 4, 2021 12:07
Co-authored-by: Even Rouault <>
Co-authored-by: Even Rouault <>
tinshift_simplified_etrs89_ngo48.json removed in Makefile
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rouault commented Mar 9, 2021

@himsve Do you want to get this merged as it before EPSG comes with a code for the tinshift method ?

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himsve commented Mar 10, 2021

Yes, please merged it. As I mentioned, this is just a temporary solution until EPSG handles TIN transformations. But it's works well. 👍

@rouault rouault added this to the 8.1.0 milestone Mar 10, 2021
@rouault rouault merged commit ffc6e87 into OSGeo:master Mar 10, 2021
rouault added a commit to rouault/PROJ that referenced this pull request Mar 23, 2021
…), and NGO48 to ETRS89 TIN transfrm (OSGeo#2554)

* Correction grid NKG:ETRF14 to EPSG:7922

* Added NKG:ITRF_TO_NO GIE test

* Correction grid no_kv_NKGETRF14_EPSG7922_2000 added to grid_alternatives.sql

* proj_method 'velocity_grid' added in check_grid_alternatives_proj_method. NKG velocity grid added to grid_alternatives.sql

* also include follow-up fix to master OSGeo#2548: e10a849

* Add NGO48 (EPSG:4273) to ETRS89 (EPSG:4258) triangulation-based transformation (OSGeo#2554)

Co-authored-by: Even Rouault <>
@himsve himsve deleted the ngo48_typo branch May 14, 2021 20:06
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2 participants