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Ran 08 May 2017 02:56PM UTC

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Committed 08 May 2017 02:50PM UTC coverage: 74.113% (-0.02%) from 74.131%

Job # BUILD_NAME=linux_gcc DETAILS="linux, gcc"

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Extended Helmert transformation to 14-parameters

Extended Helmert transformation to 14-parameters.

This commit extends the Helmert transformationto the fourth dimension and
enables spatio-temporal datum shifts in PROJ.4. On top of the usual 7
parameters (+x, +y, +z, +s, +rx, +ry, +rz) the rates of change of the seven
parameters can now be used as well. The new parameters are called +dx,
+dy, +dx, +ds, +drx, +dry and +drz. To keep track of the datum epoch and
coordinate epoch two additional parameters have been added to the
Helmert transformation, one of which is mandatory in the 14-parameter
case. The mandatory datum epoch is controlled with +epoch (given in
YYYY.yyyy format) and the coordinate, or observation, epoch is either
controlled in the proj-string with +tobs or by using 4D-coordinates
when transformating coordinates with pj_trans().

See the test functions for examples of how to set up the transformation
with 14 parameters.

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