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Australian datum transformations
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Based on material from:

Intergovernmental Committee on Surveying and Mapping (ICSM)
Permanent Committee on Geodesy (PCG):

Geocentric Datum of Australia 2020 Technical Manual
Version 1.0, 25 July 2017

Which is distributed under Creative Commons CC-BY 4.0

These tests will probably be useful as a template for an AU setup file, defining
transformations for Australian systems, but I'm reluctant to provide such a file
myself - it probably should come from official AU sources.

Thomas Knudsen, thokn@sdfe.dk, 2017-11-27
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<gie>

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GDA94 to GDA2020
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Just the Helmert transformation, to verify that we are within 100 um
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operation proj=helmert
          convention=coordinate_frame
          x =  0.06155   rx = -0.0394924
          y = -0.01087   ry = -0.0327221
          z = -0.04019   rz = -0.0328979    s = -0.009994

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tolerance  75 um
accept    -4052051.7643 4212836.2017 -2545106.0245
expect    -4052052.7379 4212835.9897 -2545104.5898
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GDA94 to GDA2020
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All the way from geographic-to-cartesian-and-back-to-geographic
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operation proj = pipeline ellps=GRS80;
          step proj = cart;
          step proj = helmert
               convention=coordinate_frame
               x  =  0.06155;   rx = -0.0394924;
               y  = -0.01087;   ry = -0.0327221;
               z  = -0.04019;   rz = -0.0328979;  s = -0.009994;
          step proj = cart inv;
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tolerance  2 mm
accept    133.88551329 -23.67012389  603.3466  0   # Alice Springs GDA94
expect    133.8855216  -23.67011014  603.2489  0   # Alice Springs GDA2020
-------------------------------------------------------------------------------


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ITRF2014@2018 to GDA2020  -  Test point ALIC (Alice Springs)
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Just the Helmert transformation, to verify that we are within 100 um
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operation proj = helmert    exact convention=coordinate_frame

          x = 0   rx = 0   dx = 0   drx = 0.00150379
          y = 0   ry = 0   dy = 0   dry = 0.00118346
          z = 0   rz = 0   dz = 0   drz = 0.00120716

          s = 0   ds = 0   t_epoch=2020.0
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tolerance  40 um
accept     -4052052.6588 4212835.9938 -2545104.6946 2018.0      # ITRF2014@2018.0
expect     -4052052.7373 4212835.9835 -2545104.5867             #  GDA2020
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</gie>