Yet more evidence for a north-south slope in the Australian height datum
Access Status
Authors
Date
2006Type
Metadata
Show full item recordCitation
Source Title
ISSN
Faculty
Remarks
The Version of Record of this manuscript has been published and is available in Journal of Spatial Science, 2006. http://www.tandfonline.com/10.1080/14498596.2006.9635076
Collection
Abstract
The results here add to the body of evidence for a systematic north-south error in the Australian Height Datum (AHD). Previous studies based solely on Global Positioning System (GPS) and a gravimetric geoid model have suffered from the 'inseparability problem', where it is not possible to discriminate between errors in the AHD and geoid. Instead, this study compares horizontal gradients of the AUSGeoid98 regional gravimetric geoid model with totally independent astrogeodetically observed vertical deflections at 741 Laplace stations across Australia. These comparisons do not show any significant latitude-dependent residuals, thus significantly reducing the likelihood of a north-south slope in AUSGeoid98. Subsequently using GPS and AUSGeoid98, now that the inseparability problem has been addressed, there is very compelling evidence for a real north-south slope of ~1.5m in the AHD.
Related items
Showing items related by title, author, creator and subject.
-
Featherstone, Will (2004)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 ...
-
Featherstone, 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 ...
-
Collins, Alan; Fitzsimons, Ian; Hulscher, B.; Razakamanana, T. (2003)The island of Madagascar straddles the poorly understood eastern margin of the East African Orogen, which is characterised by a high-grade gneissic basement that was structurally and thermally reworked during the ...