Description

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• Bugfix
• Feature

fixes #11423

What is the current behavior?

#11423
No Support for Grid-Based Datum Adjustments on proj4's projections

What is the new behavior?

• Porj4 is updated to a newer version, which has support for "Grid Based Datum Adjustments"
• Grid-based correction can be applied to the projection definitions ( which will show corrected coordinates during transformation)

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• Yes, and I documented them in migration notes
• No

Other useful information

• On Projection definitions(localConfig) user can pass the nadgrids parameter. Before that, gridFiles must be defined with a path and the type
• Grid files will be loaded while starting the app to proj4
• While transformation, proj4 knows to apply the correction from grid files.

Notes:

• sample config files on localConfig

  •        "gridFiles": {
           "PENR2009": {
             "path": "http://localhost:8000/PENR2009.gsb", // add hosted url here
             "type": "gsb",
             "description": "ETRS89 transformation grid"
           },
           "es_ign_egm08-rednap": {
             "path": "https://cdn.proj.org/ca_nrc_NA83SCRS.tif",
             "type": "geotiff"
           }
         },
         "projectionDefs": [
           {
             "code": "EPSG:25830",
             "def": "+proj=utm +zone=30 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs +nadgrids=PENR2009",
             "extent": [
               166021.44,
               0,
               833978.56,
               9329005.18
             ],
             "worldExtent": [
               -18,
               27,
               5,
               44
             ]
           },
       ]
    

• Coordinates should be different with and without +nadgrids in projectionDefs
• Coordinate transformation only works where the area of the grid file is. e.g
  • 
  • For other regions, the coordinate is zero as the default mapstore behaviour.
  • 
  • GSB and geotif file testing
    • On development, used a custom file server written in Python for gsb: https://github.com/rowheat02/MapStore2/blob/prjgridbackup/file_server.py
      • python3 file_server.py parent/path/of/file -p 8000
    • For GeoTIFF custom server was not working for some reason, so only tested on this free-to-use CDN file https://cdn.proj.org/ca_nrc_NA83SCRS.tif
    • Real tiff grid files can be found here: https://github.com/OSGeo/PROJ-data/tree/master
• tested on base map for EPSG
• - CRS and bbox are sent correctly and also rendered on the canvas