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Doc: fix example whith used the +t_obs parameter of Helmert removed per #1264 #3041

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Feb 7, 2022
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Doc: fix example whith used the +t_obs parameter of Helmert removed per #1264 #3041

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12 changes: 5 additions & 7 deletions docs/source/resource_files.rst
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Expand Up @@ -459,22 +459,20 @@ the ellipsoid as in the following example
+init=epsg:25832 +ellps=intl

where the Hayford ellipsoid is used instead of the predefined GRS80 ellipsoid.

It is also possible to add additional parameters not specified in the init file,
for instance by adding an observation epoch when transforming from ITRF2000 to
ITRF2005:
for instance by adding a central epoch when applying the ITRF2014:NOAM plate
motion model:

::

+init=ITRF2000:ITRF2005 +t_obs=2010.5
+init=ITRF2014:NOAM +t_epoch=2010.0

which then expands to

::

+proj=helmert +x=-0.0001 +y=0.0008 +z=0.0058 +s=-0.0004
+dx=0.0002 +dy=-0.0001 +dz=0.0018 +ds=-0.000008
+t_epoch=2000.0 +convention=position_vector
+t_obs=2010.5
+proj=helmert +drx=0.000024 +dry=-0.000694 +drz=-0.000063 +convention=position_vector +t_epoch=2010.0

Below is a list of the init files that are packaged with PROJ.

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