diff options
| -rw-r--r-- | docs/source/grids.rst | 5 | ||||
| -rw-r--r-- | docs/source/usage/operations/transformations/hgridshift.rst | 3 | ||||
| -rw-r--r-- | docs/source/usage/operations/transformations/vgridshift.rst | 3 |
3 files changed, 11 insertions, 0 deletions
diff --git a/docs/source/grids.rst b/docs/source/grids.rst index 7f362a92..4c0bc577 100644 --- a/docs/source/grids.rst +++ b/docs/source/grids.rst @@ -11,6 +11,11 @@ Grids Grid files are important for shifting and transforming between datums +PROJ supports CTable2, NTv1 and NTv2 files for horizontal grid corrections and +the GTX file format for vertical corrections. Details about the formats can be +found in the GDAL documentation. GDAL reads and writes all formats. Using GDAL +for construction of new grids is recommended. + US, Canadian, French and New Zealand -------------------------------------------------------------------------------- diff --git a/docs/source/usage/operations/transformations/hgridshift.rst b/docs/source/usage/operations/transformations/hgridshift.rst index bd147c2f..a9690260 100644 --- a/docs/source/usage/operations/transformations/hgridshift.rst +++ b/docs/source/usage/operations/transformations/hgridshift.rst @@ -34,3 +34,6 @@ is not found in the PROJ.4 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. diff --git a/docs/source/usage/operations/transformations/vgridshift.rst b/docs/source/usage/operations/transformations/vgridshift.rst index 272b24ab..31b3e56e 100644 --- a/docs/source/usage/operations/transformations/vgridshift.rst +++ b/docs/source/usage/operations/transformations/vgridshift.rst @@ -36,3 +36,6 @@ is not found in the PROJ.4 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 the GTX file format for vertical grid corrections. Details +about all the format can be found in the GDAL documentation. GDAL both reads and +writes the format. Using GDAL for construction of new grids is recommended. |