REFINEMENT OF GRAVIMETRIC GEOID USING GPS AND LEVELING DATA

A gravimetric geoid model does not allow the accurate transformation of Global Positioning System (GPS) ellipsoidal heights to Australian Height Datum (AHD) heights in the Perth region of Western Australia. This is predominantly due to the effect of the geological structures associated with the Darling Fault, the availability and quality of data, and the possibility of distortions in the AHD. Therefore a combined solution is sought, where 99 collocated GPS and AHD heights are used to adjust the gravimetric geoid such that it provides a model of the separation between the AHD and the GRS80 reference ellipsoid. This data combination was investigated using least-squares collocation and continuous curvature splines in tension. The least-squares collocation technique was found to give an improved model of the AHDGRS80 separation, as shown by a standard deviation of fit of the combined model to the control data of 8 mm. In comparison, the gravimetric geoid gives a standard deviation of fit to the control data of 128 mm.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339453
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Featherstone, W E
• Publication Date: 2000-5

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 27-56
• Serial:
  • Journal of Surveying Engineering
  • Volume: 126
  • Issue Number: 2
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9453
  • Serial URL: http://ascelibrary.org/journal/jsued2

Subject/Index Terms

• TRT Terms: Algorithms; Curve fitting; Faults; Geologically affected surfaces; Geometry; Global Positioning System; Gravimetric analysis; Height; Least squares method; Leveling; Mathematical models; Satellite navigation systems; Splines; Statistical analysis
• Identifier Terms: Australian Height Datum
• Uncontrolled Terms: Geoid
• Geographic Terms: Perth (Australia)
• Subject Areas: Data and Information Technology; Geotechnology; Highways; Planning and Forecasting; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00793994
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 16 2000 12:00AM