Add 2 grid files for nl_nsgi

[Jochem-L]

I wasn't able to run regenerate_index_html.py (step 7 of https://github.com/OSGeo/PROJ-data/blob/master/CONTRIBUTING.md).

[jjimenezshaw]

I wasn't able to run regenerate_index_html.py

You can try this: #134 (comment)

For the generation of the data I recommend using a script, as explained in #134 (comment)

[jjimenezshaw]

This is not the filename I see added in this PR: nl_nsgi_nllat2018.tif.
Maybe it would be useful to mention the full name of the target CRS: EPSG:9287 "LAT NL depth" (to see it is a depth one).

[Jochem-L]

Good catch! Line 41 of the nl_nsgi/nl_nsgi_README.txt should be indeed nl_nsgi_nllat2018.tif

[Jochem-L]

I wasn't able to run regenerate_index_html.py

You can try this: #134 (comment)
For the generation of the data I recommend using a script, as explained in #134 (comment)

Generating the grid files is no problem for me, and I convert my .txt to .gtx with gdal_translate and convert that to .tif with the vertoffset_grid_to_gtiff.py script.

However, I am not able to get regenerate_index_html.py to run at the moment. I tried several things (without really understanding what I'm doing), but I keep getting diverent kinds of error messages. I hope someone else can run it when accepting this PR.

[rouault]

I've regenerated the index

[Jochem-L]

I've regenerated the index

Thanks!

[ag-pix4d]

@Jochem-L just to be sure, there should be a corresponding PR in PROJ to add the link nl_nsgi_bongeo2004.tif <-> bongeo2004.gtx to grid_alternatives table (similar to OSGeo/PROJ#4457) so that PROJ can use this grid file, right?

[Jochem-L]

@ag-pix4d, I thought this was fixed by @rouault on 25 March. However, testing with PROJ 9.6.2 and PROJ-data 1.22 indeed gives a warning PROJ can't find bongeo2004.gtx while it should look for nl_nsgi_bongeo2004.tif. So it looks like link is still missing, but I'm not sure how to fix this.

projinfo -s EPSG:10761 -t EPSG:10764 --hide-ballpark -o proj
Candidate operations found: 1
-------------------------------------
Operation No. 1:

unknown id, Bonaire 2004 to Bonaire height (1) + Inverse of Bonaire to Bonaire 2004 (1) + Bonaire Transverse Mercator, 0.3 m, Bonaire, Sint Eustatius and Saba (BES Islands or Caribbean Netherlands) - Bonaire - onshore., at least one grid missing

PROJ string:
+proj=pipeline
  +step +proj=axisswap +order=2,1
  +step +proj=unitconvert +xy_in=deg +xy_out=rad
  +step +inv +proj=vgridshift +grids=bongeo2004.gtx +multiplier=1
  +step +proj=push +v_3
  +step +proj=cart +ellps=GRS80
  +step +inv +proj=helmert +exact +x=-366.1939 +y=-115.0688 +z=-776.7039
        +rx=20.96308 +ry=16.462749 +rz=-14.276379 +s=-12.809
        +convention=coordinate_frame
  +step +inv +proj=cart +ellps=intl
  +step +proj=pop +v_3
  +step +proj=tmerc +lat_0=12.180658675 +lon_0=-68.2518022805556 +k=1
        +x_0=23209.56 +y_0=21423.99 +ellps=intl

Grid bongeo2004.gtx needed but not found on the system.

[rouault]

I thought this was fixed by @rouault on 25 March

no, I meant I had regenerated the geojson and html indexes for this repository (PROJ-data), but not for the PROJ database itself. I've just submitted OSGeo/PROJ#4534 for that. Please double check

[Jochem-L]

Thanks!