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The many paths to a common ground: A comparison of transformations between GDA94 and ITRF
Citation
Haasdyk, J and Janssen, V, The many paths to a common ground: A comparison of transformations between GDA94 and ITRF, Proceedings of IGNSS 2011 Symposium, 15-17 November 2011, Sydney EJ (2011) [Refereed Conference Paper]
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Copyright Statement
Copyright 2011 IGNSS Society Inc.
Official URL: http://www.ignss.org/
Abstract
Digital positioning data are currently collected and stored in a variety of
reference frames or datums. Before different data can be compared or
combined, they must be brought together onto the same datum. The practice
of transforming from one datum to another is certainly not difficult and the
necessary parameters are available in many different software packages. To
complicate this issue, today’s datum of choice may well be a global, and
therefore dynamic, datum such as the International Terrestrial Reference
Frame (ITRF). In a dynamic datum it is important to note both the datum
realisation (e.g. ITRF2000, ITRF2005, ITRF2008, etc.) and the epoch at
which the data are valid. We must also be able to propagate the data from
one epoch to another, if desired, by taking tectonic motion into account.
Since the Geocentric Datum of Australia (GDA94) was introduced there
have been several refinements of ITRF, and also refinements of the
transformation parameters between GDA94 and ITRF. As a result, there are
many different combinations of transformation and propagation by which the
data can be ‘moved’ from GDA94 to a particular ITRF and vice versa. This
paper demonstrates that differences up to several centimetres in both
horizontal and vertical coordinates can result from following different ‘paths
of transformation’ and suggests that some but not all users need to be careful
of the methods employed by their software.
Additionally, what is often not considered is the effect of the formal errors in
the transformation procedure on the estimated error of the output
coordinates. We discuss and demonstrate these effects for several sample
transformations to give the reader a better understanding of the effect of
transformations on the quality of their data.
Item Details
| Item Type: | Refereed Conference Paper |
|---|---|
| Keywords: | Coordinate transformation, tectonic motion, GDA94, ITRF, |
| Research Division: | Engineering |
| Research Group: | Geomatic Engineering |
| Research Field: | Geodesy |
| Objective Division: | Environment |
| Objective Group: | Natural Hazards |
| Objective Field: | Natural Hazards not elsewhere classified |
| Author: | Janssen, V (Dr Volker Janssen) |
| ID Code: | 74462 |
| Year Published: | 2011 |
| Deposited By: | Geography and Environmental Studies |
| Deposited On: | 2011-12-02 |
| Last Modified: | 2014-12-11 |
| Downloads: | 206 View Download Statistics |
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