Gridshift bug fix and improvements

busstoptaktik / geodesy

Rust geodesy

Apache License 2.0

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Closed busstoptaktik closed 8 months ago

busstoptaktik commented 8 months ago

Repair grid interpolation. Now replicates PROJ results exactly.
Add some tiny NTv2 files:
- 5458.gsb: A NTv2 version of the existing test.datum file (54N..58N, 8E..16E),
- 5458_with_subgrid.gsb: As 5458.gsb, but with a denser subgrid at (55N..56N, 12E..14E)

(the latter may be useful in PR #74)