A high-precision digital astrogeodetic traverse in an area of steep geoid gradients close to the coast of Perth, Western Australia
Access Status
Authors
Date
2018Type
Metadata
Show full item recordCitation
Source Title
ISSN
School
Remarks
The final publication is available at Springer via http://dx.doi.org/10.1007/s00190-017-1107-x
Collection
Abstract
We present results from a new vertical deflection (VD) traverse observed in Perth, Western Australia, which is the first of its kind in the Southern Hemisphere. A digital astrogeodetic QDaedalus instrument was deployed to measure VDs with ~0.2 ′′ precision at 39 benchmarks with a ∼1 km spacing. For the conversion of VDs to quasigeoid height differences, the method of astronomical–topographical levelling was applied, based on topographical information from the Shuttle Radar Topography Mission. The astronomical quasigeoid heights are in 20–30 mm (RMS) agreement with three independent gravimetric quasigeoid models, and the astrogeodetic VDs agree to 0.2–0.3′′ (north–south) and 0.6–0.9′′ (east–west) RMS. Tilt-like biases of ∼1mm over ∼1km are present for all quasigeoid models within ∼20km of the coastline, suggesting inconsistencies in the coastal zone gravity data. The VD campaign in Perth was designed as a low-cost effort, possibly allowing replication in other Southern Hemisphere countries (e.g., Asia, Africa, South America and Antarctica), where VD data are particularly scarce.
Related items
Showing items related by title, author, creator and subject.
-
Amos, Matthew (2007)One goal of modern geodesy is the global unification of vertical datums so that height data from them can be properly integrated. This thesis studies the unification of the 13 disparate levelling- and tide-gauge-based ...
-
Tenzer, R.; Hirt, C.; Claessens, Sten; Novák, P. (2015)In geodesy, the geoid and the quasigeoid are used as a reference surface for heights. Despite some similarities between these two concepts, the differences between the geoid and the quasigeoid (i.e. the geoid-to-quasigeoid ...
-
Featherstone, Will; Kirby, Jonathan; Hirt, Christian; Filmer, Michael; Claessens, Sten; Brown, N.; Hu, Guorong; Johnston, G. (2011)AUSGeoid09 is the new Australia-wide gravimetric quasigeoid model that has been a posteriori fitted to the Australian Height Datum (AHD) so as to provide a product that is practically useful for the more direct determination ...