Evidence of a north-south trend between AUSGeoid98 and AHD in southwest Australia
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The AUSGeoid98 gravimetric model has been compared with 48 GPD-levelling points at a ~50km spacing across part of the southwest of Western Australia. This is arguably the best subset of GPS-derived ellipsoidal heights in Australia with na internally estimated precision of < +-9mm. The spirit-levelled heights were tied to the Australian Height Datum(AHD)using class C techniques [12mm-root-km allowable misclose]. The comparisons shoe that AUSGeoid98 gives a GPS height transformation to the AHD with a precision of ~+-13cm, which is less than reported earlier (~+-36 cm)for a nationwide dataset. A clear north-south trend of ~0.81 mm/km [ppm] is also evident in the differences; of which approximately one-third is attributable to a north-south error in the AHD induced by dominant north-south sea surface topography effects at the nearby fixed tide gauges. After removal of this north-south trend, the standard deviation of the differences reduces to ~5 cm.
Article first published in Survey Review 2004 37(291)pp. 334-343. Survey Review ISSN 0039-6265 is published by Commonwealth Association for Surveying and Land Economy (CASLE) in the UK.
A link to the Survey Review website can be found at http://www.surveyreview.org
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Filmer, Michael Shaun (2010)The Australian Height Datum (AHD) was established in 1971, and is the basis for all physical heights in Australia. However, a complete revision of the AHD has never occurred, despite problems that, although not always ...
Evidence of a North-South Trend Between AUSGeoid98 and the Australian Height Datum in Southwest AustraliaFeatherstone, Will (2004)The AUSGeoid98 gravimetric geoid model has been compared with 48 GPS-levelling points at a ~50 km spacing across part of the southwest of Western Australia. This is arguably the best subset of GPS-derived ellipsoidal ...
Featherstone, Will; Filmer, Michael (2008)Previous work on assessing the errors in the Australian Height Datum (AHD) across Western Australia used fewer and older global positioning system (GPS) data and a global quasigeoid model. A larger and improved State-wide ...