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| author | Kristian Evers <kristianevers@gmail.com> | 2020-06-03 07:40:40 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-06-03 07:40:40 +0200 |
| commit | b66798a8f3d559b5fe28c22973241e97d191a053 (patch) | |
| tree | 8fee056bcd3d76abba93602b9a4e9bb4086d644f | |
| parent | a0a44ac57e1afcce26bb8f7e5b7c41bf4661b8ab (diff) | |
| parent | 81602f3860d5e1c79441c9c94f63d687cd106b15 (diff) | |
| download | PROJ-b66798a8f3d559b5fe28c22973241e97d191a053.tar.gz PROJ-b66798a8f3d559b5fe28c22973241e97d191a053.zip | |
Merge pull request #2251 from kbevers/doc-deformation
Docs: Use +grids and tif file for deformation examples
| -rw-r--r-- | docs/source/operations/transformations/deformation.rst | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/docs/source/operations/transformations/deformation.rst b/docs/source/operations/transformations/deformation.rst index c28e9404..eeff840b 100644 --- a/docs/source/operations/transformations/deformation.rst +++ b/docs/source/operations/transformations/deformation.rst @@ -62,8 +62,7 @@ to the Danish realisation of ETRS89 is in PROJ described as:: z = -0.048 rz = -0.008712 drz = -0.000792 # ETRF2000@t_obs -> NKG_ETRF00@2000.0 step proj = deformation t_epoch = 2000.0 - xy_grids = ./nkgrf03vel_realigned_xy.ct2 - z_grids = ./nkgrf03vel_realigned_z.gtx + grids = ./eur_nkg_nkgrf03vel_realigned.tif inv # NKG_ETRF@2000.0 -> ETRF92@2000.0 step proj=helmert convention=position_vector s = -0.009420e @@ -72,16 +71,13 @@ to the Danish realisation of ETRS89 is in PROJ described as:: z = 0.02776 rz = 4.729e-05 # ETRF92@2000.0 -> ETRF92@1994.704 step proj = deformation dt = -5.296 - xy_grids = ./nkgrf03vel_realigned_xy.ct2 - z_grids = ./nkgrf03vel_realigned_z.gtx + grids = ./eur_nkg_nkgrf03vel_realigned.tif From this we can see that the transformation from ITRF2008 to the Danish realisation of ETRS89 is a combination of Helmert transformations and adjustments with a deformation model. The first use of the deformation operation is:: - proj = deformation t_epoch = 2000.0 - xy_grids = ./nkgrf03vel_realigned_xy.ct2 - z_grids = ./nkgrf03vel_realigned_z.gtx + proj = deformation t_epoch = 2000.0 grids = ./eur_nkg_nkgrf03vel_realigned.tif Here we set the central epoch of the transformation, 2000.0. The observation epoch is expected as part of the input coordinate tuple. The deformation model is @@ -228,4 +224,4 @@ that is searched for in the grid. :math:`(E, N, U)` are the grid values in ENU-s See also ----------------------------------------------------------------------------- -#. :ref:`Behavioural changes from version 5 to 6<differences_deformation>`
\ No newline at end of file +#. :ref:`Behavioural changes from version 5 to 6<differences_deformation>` |