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https://github.com/OSGeo/PROJ/pull/1777
- Move content of legacy apply_gridshift.cpp and apply_vgridshift.cpp in grids.cpp
- Rename nad_ functions to pj_hgrid_
- Rename internal proj_hgrid_/proj_vgrid_ functions to pj_
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proj utility (fixes #1782)
Fixes side-effect of https://github.com/OSGeo/PROJ/issues/1525 that went in 6.1.1
The correction is horribly hacky. Sorry...
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hgridshift/vgridshift/deformation structures
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The +t_obs parameter was confusing for users since it effectively
overwrote the observation time in input coordinates. To make it more clear
what is the operation is doing, users are now required to directly specify
the time span for which they wish to apply a given deformation. The parameter
+dt has been added for that purpose. The new parameter is mutually
exclusive with +t_epoch. +dt is used when deformation
for a set amount of time is needed and +t_epoch is used (in
conjunction with the observation time of the input coordinate) when
deformation from a specific epoch to the observation time is needed.
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structures
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