[teqc] slight addtion to '+psp' output for next release

Lou Estey lou at unavco.org
Thu Jan 10 08:18:16 MST 2019


If you use the '+psp' option:

The '+psp' option was discussed in tip of week 1938:
https://postal.unavco.org//pipermail/teqc/2017/002231.html

The next release will include an initial line showing the reference position
in XYZ (meters), rounded to the nearest 0.1 mm:

[825] teqc +quiet +psp . +mds 5024K68287201507190000a.tgd | more
   reference XYZ = -1282444.0961 -4718360.5862  4084201.5947
2015 Jul 19 00:00:00.000      0.0000    0.0000    0.0000    -0.014   0.005   0.002    2.623  0.038
2015 Jul 19 00:00:30.000     -0.0024    0.0035    0.0069     0.006  -0.015  -0.007    2.369  0.061
2015 Jul 19 00:01:00.000     -0.0050   -0.0005   -0.0017     0.003  -0.016  -0.009    2.369 -0.130
...

The topocentric rotation matrix, which is needed in order to compute
the delta position changes in a local ENu (east-north-up) coordinate system,
is computed from the reference XYZ position shown.  (This applies even if
you are supplying the reference position via the '-O.px' or '-O.pg' option.)

Therefore, if needed, you can exactly reconstruct the topocentric rotation matrix
using parameters from the WGS84 ellipsoid, rotate each local ENu delta back
into a delta XYZ, and add the delta XYZ to the reference position to obtain
the XYZ at each epoch.

cheers,
--lou

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Louis H. Estey, Ph.D.              office:  [+001] 303-381-7456
UNAVCO, 6350 Nautilus Drive           FAX:  [+001] 303-381-7451
Boulder, CO  80301-5554            e-mail:  lou  unavco.org

"If the universe is the answer, what is the question?"
                                                -- Leon Lederman
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