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diff --git a/docs/source/usage/operations/transformations/hgridshift.rst b/docs/source/usage/operations/transformations/hgridshift.rst deleted file mode 100644 index 7f3c9895..00000000 --- a/docs/source/usage/operations/transformations/hgridshift.rst +++ /dev/null @@ -1,39 +0,0 @@ -.. _hgridshift: - -================================================================================ -Horizontal grid shift -================================================================================ - -Change of horizontal datum by grid shift. - -+-----------------+--------------------------------------------------------------------+ -| **Input type** | Geodetic coordinates. | -+-----------------+--------------------------------------------------------------------+ -| **Output type** | Geodetic coordinates. | -+-----------------+--------------------------------------------------------------------+ -| **Options** | -+-----------------+--------------------------------------------------------------------+ -| `+grids` | Comma-separated list of grids to load. | -+-----------------+--------------------------------------------------------------------+ - -The horizontal grid shift is done by offsetting the planar input coordinates by -a specific amount determined by the loaded grids. The simplest use case of the -horizontal grid shift is applying a single grid:: - - +hgridshift +grids=nzgr2kgrid0005.gsb - - -More than one grid can be loaded at the same time, for instance in case the -dataset needs to be transformed spans several countries. In this example grids -of the continental US, Alaska and Canada is loaded at the same time:: - - +hgridshift +grids=@conus,@alaska,@ntv2_0.gsb,@ntv_can.dat - -The ``@`` in the above example states that the grid is optional, in case the grid -is not found in the PROJ search path. The list of grids is prioritized so that -grids in the start of the list takes presedence over the grids in the back of the -list. - -PROJ supports CTable2, NTv1 and NTv2 files for horizontal grid corrections. Details -about all three formats can be found in the GDAL documentation. GDAL reads and -writes all three formats. Using GDAL for construction of new grids is recommended. |