Surveying adjustment datum and relative deformation accuracy analysis
In the surveying adjustment, unknown parameters are usually not direct observations, but the elements related to these direct observations. In order to determine the unknown parameters adequate known data should be provided, and these necessarily required known data are used to form the adjustment d...
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| Format: | Article |
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Taylor & Francis
2014
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| Online Access: | https://eprints.nottingham.ac.uk/35384/ |
| _version_ | 1848795065415106560 |
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| author | Chen, Guoliang Meng, Xiaolin Yao, Lianbi |
| author_facet | Chen, Guoliang Meng, Xiaolin Yao, Lianbi |
| author_sort | Chen, Guoliang |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | In the surveying adjustment, unknown parameters are usually not direct observations, but the elements related to these direct observations. In order to determine the unknown parameters adequate known data should be provided, and these necessarily required known data are used to form the adjustment datum. Under different datums, different results will be obtained even with the same direct observations. However, in the practical adjustment calculation, the datum and its effect on the results are always ignored. In this paper, the adjustment datum is firstly discussed and defined as datum equations. Then an adjustment method based on the datum equations and least squares is presented. This method is a generic one, not only suited for the case in an ordinary datum but also in the gravity centre datum or a quasi-datum, and can be easily used to analyse different deformations. Based on this method, the transformation between different reference frames is derived. It shows that the calculation results, deformation and positioning accuracy under one kind of datum are relative and generic. A case study is further introduced and used to test this new method. Based on the case study, the conclusions are reached. It is found that the relative positional root mean square error of each point becomes bigger as the distance between the point and the datum increases, and the relative deformation offsets under different kinds of datum are helpful for reliable deformation analysis. |
| first_indexed | 2025-11-14T19:26:10Z |
| format | Article |
| id | nottingham-35384 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:26:10Z |
| publishDate | 2014 |
| publisher | Taylor & Francis |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-353842020-05-04T16:52:34Z https://eprints.nottingham.ac.uk/35384/ Surveying adjustment datum and relative deformation accuracy analysis Chen, Guoliang Meng, Xiaolin Yao, Lianbi In the surveying adjustment, unknown parameters are usually not direct observations, but the elements related to these direct observations. In order to determine the unknown parameters adequate known data should be provided, and these necessarily required known data are used to form the adjustment datum. Under different datums, different results will be obtained even with the same direct observations. However, in the practical adjustment calculation, the datum and its effect on the results are always ignored. In this paper, the adjustment datum is firstly discussed and defined as datum equations. Then an adjustment method based on the datum equations and least squares is presented. This method is a generic one, not only suited for the case in an ordinary datum but also in the gravity centre datum or a quasi-datum, and can be easily used to analyse different deformations. Based on this method, the transformation between different reference frames is derived. It shows that the calculation results, deformation and positioning accuracy under one kind of datum are relative and generic. A case study is further introduced and used to test this new method. Based on the case study, the conclusions are reached. It is found that the relative positional root mean square error of each point becomes bigger as the distance between the point and the datum increases, and the relative deformation offsets under different kinds of datum are helpful for reliable deformation analysis. Taylor & Francis 2014-08-12 Article PeerReviewed Chen, Guoliang, Meng, Xiaolin and Yao, Lianbi (2014) Surveying adjustment datum and relative deformation accuracy analysis. Survey Review, 46 (339). pp. 406-410. ISSN 1752-2706 Surveying adjustment Datum equations Relative position error Relative deformation http://www.tandfonline.com/doi/full/10.1179/1752270614Y.0000000124#.V5XloqKAe5o doi:10.1179/1752270614Y.0000000124 doi:10.1179/1752270614Y.0000000124 |
| spellingShingle | Surveying adjustment Datum equations Relative position error Relative deformation Chen, Guoliang Meng, Xiaolin Yao, Lianbi Surveying adjustment datum and relative deformation accuracy analysis |
| title | Surveying adjustment datum and relative deformation accuracy analysis |
| title_full | Surveying adjustment datum and relative deformation accuracy analysis |
| title_fullStr | Surveying adjustment datum and relative deformation accuracy analysis |
| title_full_unstemmed | Surveying adjustment datum and relative deformation accuracy analysis |
| title_short | Surveying adjustment datum and relative deformation accuracy analysis |
| title_sort | surveying adjustment datum and relative deformation accuracy analysis |
| topic | Surveying adjustment Datum equations Relative position error Relative deformation |
| url | https://eprints.nottingham.ac.uk/35384/ https://eprints.nottingham.ac.uk/35384/ https://eprints.nottingham.ac.uk/35384/ |