diff options
Diffstat (limited to 'docs/source/usage')
| -rw-r--r-- | docs/source/usage/transformation.rst | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/docs/source/usage/transformation.rst b/docs/source/usage/transformation.rst index acec0bb5..b4ed7031 100644 --- a/docs/source/usage/transformation.rst +++ b/docs/source/usage/transformation.rst @@ -75,7 +75,7 @@ the introduction). In PROJ it can be implemented as proj=pipeline step proj=cart ellps=intl - step proj=helmert + step proj=helmert convention=coordinate_frame x=-81.0703 y=-89.3603 z=-115.7526 rx=-0.48488 ry=-0.02436 rz=-0.41321 s=-0.540645 step proj=cart inv ellps=GRS80 @@ -101,7 +101,7 @@ deprecated system with decimeter level tensions. step init=./s45b.pol:s45b_tc32 step proj=utm inv ellps=intl zone=32 step proj=cart ellps=intl - step proj=helmert + step proj=helmert convention=coordinate_frame x=-81.0703 y=-89.3603 z=-115.7526 rx=-0.48488 ry=-0.02436 rz=-0.41321 s=-0.540645 step proj=cart inv ellps=GRS80 @@ -116,16 +116,15 @@ data, but the 14-parameter Helmert transform expects temporal units in decimalye Hence the first step in the pipeline is the unitconvert pseudo-projection that makes sure the correct units are passed along to the Helmert transform. Most parameters of the Helmert transform are taken from :cite:`Altamimi2002`, -except the epoch which is the epoch of the transformation. The default setting is to -use “coordinate frame” convention of the Helmert transform, but “position vector” -convention can also be used. The last step in the pipeline is converting the +except the epoch which is the epoch of the transformation. +The last step in the pipeline is converting the coordinate timestamps back to GPS weeks. :: proj=pipeline step proj=unitconvert t_in=gps_week t_out=decimalyear - step proj=helmert + step proj=helmert convention=coordinate_frame x=0.0127 y=0.0065 z=-0.0209 s=0.00195 rx=0.00039 ry=-0.00080 rz=0.00114 dx=-0.0029 dy=-0.0002 dz=-0.0006 ds=0.00001 |