Geoscience Reference
In-Depth Information
Fig. 1 Map of global positioning system (GPS) velocity vectors from the study by (Michel et al.
2001
). Black arrows represent GPS velocity vectors of the permanent stations from IGS and
AUSLIG; red and white arrows shows velocities derived in the study where the red arrows
represent 'stable' Sundaland velocities. Blue dots denote epicentres of crustal earthquakes from
the U.S. Geological Survey (USGS) catalogue (1973-2001)
consequence is not only seen to affect the activities of survey and mapping, but
will also have a big impact on the socio-economic and environment in general.
Therefore, a geocentric datum must consider the earth's geodynamic processes
(Kelly
2012
).
This study firstly addresses the establishment and the current status of the
GDM2000. Secondly, tests were conducted to assess the reliability of the MyR-
TKnet stations' coordinates in GDM2000 by analysing the datum shifts via (1) the
displacement of MyRTKnet stations between epoch 2000 and epoch 2011 in
ITRF2000, (2) displacement of MyRTKnet stations between epoch 2000 in
ITRF2000 and epoch 2011 in ITRF2008. Finally, the implications of a non-
geocentric datum are discussed.
