Hi Playing with the latest master in the Czech Republic, I noticed something strange. The new grid file cz_cuzk_table_-y-x_3_v1710.tif is used only if the projected CRS EPSG:5514 is used, but not with its geographic "parent", S-JTSK EPSG:4156. Well, it is at position 13 on the list of operations.
Just compare PROJ_NETWORK=ON ./projinfo -o proj --3d EPSG:4258 EPSG:5514+8357 --spatial-test intersects with PROJ_NETWORK=ON ./projinfo -o proj --3d EPSG:4258 EPSG:4156+8357 --spatial-test intersects Doing only 2D transformation, it is even more clear. The grid file is never used with EPSG:4156 Does it make sense? I know that the grid file is defined in EPSG:5514. But I assume that the correction applies to the geographic system transformation, not to the Krovak projection itself. Cheers Javier.
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