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Diffstat (limited to 'docs/source/operations/transformations/deformation.rst')
| -rw-r--r-- | docs/source/operations/transformations/deformation.rst | 39 |
1 files changed, 37 insertions, 2 deletions
diff --git a/docs/source/operations/transformations/deformation.rst b/docs/source/operations/transformations/deformation.rst index 3a9d025c..02924a25 100644 --- a/docs/source/operations/transformations/deformation.rst +++ b/docs/source/operations/transformations/deformation.rst @@ -35,6 +35,9 @@ GTX format. Both grids are expected to contain grid-values in units of mm/year. GDAL both reads and writes both file formats. Using GDAL for construction of new grids is recommended. +Starting with PROJ 7.0, use of a GeoTIFF format is recommended to store both +the horizontal and vertical velocities. + Example ------------------------------------------------------------------------------- @@ -89,13 +92,15 @@ Parameters .. option:: +xy_grids=<list> - Comma-separated list of grids to load. If a grid is prefixed by an `@` the + Comma-separated list of grids to load. If a grid is prefixed by an ``@`` the grid is considered optional and PROJ will the not complain if the grid is not available. - Grids for the horizontla component of a deformation model is expected to be + Grids for the horizontal component of a deformation model is expected to be in CTable2 format. + .. note:: :option:`+xy_grids` is mutually exclusive with :option:`+grids` + .. option:: +z_grids=<list> Comma-separated list of grids to load. If a grid is prefixed by an `@` the @@ -105,6 +110,36 @@ Parameters Grids for the vertical component of a deformation model is expected to be in either GTX format. + .. note:: :option:`+z_grids` is mutually exclusive with :option:`+grids` + +.. option:: +grids=<list> + + .. versionadded:: 7.0.0 + + Comma-separated list of grids to load. If a grid is prefixed by an `@` the + grid is considered optional and PROJ will the not complain if the grid is + not available. + + Grids should be in GeoTIFF format with the first 3 components being + respectively the easting, northing and up velocities in mm/year. + Setting the Description and Unit Type GDAL band metadata items is strongly + recommended, so that gdalinfo reports: + + :: + + Band 1 Block=... Type=Float32, ColorInterp=Gray + Description = east_velocity + Unit Type: mm/year + Band 2 Block=... Type=Float32, ColorInterp=Undefined + Description = north_velocity + Unit Type: mm/year + Band 3 Block=... Type=Float32, ColorInterp=Undefined + Description = up_velocity + Unit Type: mm/year + + .. note:: :option:`+grids` is mutually exclusive with :option:`+xy_grids` + and :option:`+z_grids` + .. option:: +t_epoch=<value> Central epoch of transformation given in decimalyears. Will be used in |