----------------------------------------------------------------------------------- Australian datum transformations ----------------------------------------------------------------------------------- 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 ----------------------------------------------------------------------------------- <gie> ----------------------------------------------------------------------------------- GDA94 to GDA2020 ----------------------------------------------------------------------------------- Just the Helmert transformation, to verify that we are within 100 um ----------------------------------------------------------------------------------- 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 ----------------------------------------------------------------------------------- tolerance 75 um accept -4052051.7643 4212836.2017 -2545106.0245 expect -4052052.7379 4212835.9897 -2545104.5898 ------------------------------------------------------------------------------- ----------------------------------------------------------------------------------- GDA94 to GDA2020 ----------------------------------------------------------------------------------- All the way from geographic-to-cartesian-and-back-to-geographic ----------------------------------------------------------------------------------- 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; ----------------------------------------------------------------------------------- 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 ------------------------------------------------------------------------------- ----------------------------------------------------------------------------------- ITRF2014@2018 to GDA2020 - Test point ALIC (Alice Springs) ----------------------------------------------------------------------------------- Just the Helmert transformation, to verify that we are within 100 um ----------------------------------------------------------------------------------- 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 ----------------------------------------------------------------------------------- tolerance 40 um accept -4052052.6588 4212835.9938 -2545104.6946 2018.0 # ITRF2014@2018.0 expect -4052052.7373 4212835.9835 -2545104.5867 # GDA2020 ----------------------------------------------------------------------------------- </gie>