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| author | Even Rouault <even.rouault@spatialys.com> | 2018-08-21 14:38:04 +0200 |
|---|---|---|
| committer | Even Rouault <even.rouault@spatialys.com> | 2018-08-21 14:57:28 +0200 |
| commit | e05dcd84ab69e1522c67c1ec9e5b38f45fd77c6e (patch) | |
| tree | 9ec0e012e8cdd10035a8f7b0286396325004b30b /docs/source/operations/transformations/deformation.rst | |
| parent | c1f0673b3335a37eb03900315d6db3f43e3bf64c (diff) | |
| download | PROJ-e05dcd84ab69e1522c67c1ec9e5b38f45fd77c6e.tar.gz PROJ-e05dcd84ab69e1522c67c1ec9e5b38f45fd77c6e.zip | |
[BREAKING] Hermert: add +convention=position_vector/coordinate_frame, forbids +transpose (fixes #1091)
As identified in #1091, Helmert implementation in PROJ 5.0 and 5.1 is confusing.
It happens that by default it used the coordinate_frame convention, contrary to
the position_vector convention used traditionaly for +towgs84. The documentation
of Helmert was also wrongly specifying that the default convention was
position_vector.
This commit:
- bans the confusing +transpose parameter
- removes the concept of a default convention, since in practice both are
equally found, and requires +convention as soon as a rotational term parameter
is present.
For translation only, convention is ignored and optional, as having no effect.
- fixes all the identified uses of proj=helmert in code, doc and tests
This is obviously a breaking change:
- users will have to adapt their pipeline expressions
- in particular, init files that would use helmert must be adapted
However, as designed, the break will be explicit, and not silent.
Diffstat (limited to 'docs/source/operations/transformations/deformation.rst')
| -rw-r--r-- | docs/source/operations/transformations/deformation.rst | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/docs/source/operations/transformations/deformation.rst b/docs/source/operations/transformations/deformation.rst index 79d9b7b8..87b08453 100644 --- a/docs/source/operations/transformations/deformation.rst +++ b/docs/source/operations/transformations/deformation.rst @@ -51,7 +51,7 @@ to the Danish realisation of ETRS89 is in PROJ described as:: # ITRF2008@t_obs -> ITRF2000@t_obs step init = ITRF2008:ITRF2000 # ITRF2000@t_obs -> ETRF2000@t_obs - step proj=helmert t_epoch = 2000.0 transpose + step proj=helmert t_epoch = 2000.0 convention=position_vector x = 0.054 rx = 0.000891 drx = 8.1e-05 y = 0.051 ry = 0.00539 dry = 0.00049 z = -0.048 rz = -0.008712 drz = -0.000792 @@ -60,7 +60,7 @@ to the Danish realisation of ETRS89 is in PROJ described as:: xy_grids = ./nkgrf03vel_realigned_xy.ct2 z_grids = ./nkgrf03vel_realigned_z.gtx # NKG_ETRF@2000.0 -> ETRF92@2000.0 - step proj=helmert transpose s = -0.009420e + step proj=helmert convention=position_vector s = -0.009420e x = 0.03863 rx = 0.00617753 y = 0.147 ry = 5.064e-05 z = 0.02776 rz = 4.729e-05 |