Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Estimating variance components of ellipsoidal, orthometric and geoidalheights through the GPS/levelling Network in Iran
Department of Geodesy and Geomatics, Zanjan University, Iran.
Royal Institute of Technology, Stockholm, Sweden.ORCID iD: 0000-0003-0067-8631
2008 (English)In: Journal of the Earth and Space Physics, Vol. 34, no 3, 1-13 p.Article in journal (Refereed) Published
Abstract [en]

The Best Quadratic Unbiased Estimation (BQUE) of variance components in the Gauss-Helmert model is used to combine adjustment of GPS/levelling and geoid to determinethe individual variance components for each of the three height types. Through theresearch, different reasons for achievement of the negative variance components werediscussed and a new modified version of the Best Quadratic Unbiased Non-negativeEstimator (MBQUNE) was successfully developed and applied. This estimation could beuseful for estimating the absolute accuracy level which can be achieved using theGPS/levelling method. A general MATLAB function is presented for numericalestimation of variance components by using the different parametric models. Themodified BQUNE and developed software was successfully applied for estimating thevariance components through the sample GPS/levelling network in Iran. In the followingresearch, we used the 75 outlier free and well distributed GPS/levelling data. Threecorrective surface models based on the 4, 5 and 7 parameter models were used throughthe combined adjustment of the GPS/levelling and geoidal heights. Using the 7-parametermodel, the standard deviation indexes of the geoidal, geodetic and orthometric heights inIran were estimated to be about 27, 39 and 35 cm, respectively.

Place, publisher, year, edition, pages
2008. Vol. 34, no 3, 1-13 p.
Keyword [en]
Variance component estimation, Geoid, Levelling, GPS, BQUE, BQUNE, Iran
National Category
Probability Theory and Statistics
Identifiers
URN: urn:nbn:se:hv:diva-7901OAI: oai:DiVA.org:hv-7901DiVA: diva2:845879
Available from: 2015-08-13 Created: 2015-08-13 Last updated: 2015-08-27Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Eshagh, Mehdi
Probability Theory and Statistics

Search outside of DiVA

GoogleGoogle Scholar

Total: 43 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf