Research Article
Sep 1977
Vertical Control for Independent Models Blocks
Authors: Wolfgang Faig, Thomas Mathew, and Sabry El HakimAuthor Affiliations
Publication: Journal of the Surveying and Mapping Division
Volume 103, Issue 1
Abstract
In simultaneous block adjustments vertical control points need to be located in dense cross chains if no auxiliary information is available. One additional perimeter control point each between them strengthens the solution, and a further reduction of the vertical block deformation is achieved by normalizing the x-residuals in the projection centers. The use of auxiliary data leads to substantial saving of vertical control points. The interaction between vertical control point distribution, statoscope-, APR-, lake data, and combinations of these is studied with several well-controlled independent model production blocks adjusted with PAT-M-43. The tests indicate that the bridging distance can be increased to the extent that there is virtually no need for control points within the block for small and medium-scale mapping purposes.
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Published In
Journal of the Surveying and Mapping Division
Volume 103 • Issue 1 • September 1977
Pages: 37 - 46
Copyright
© 1977 American Society of Civil Engineers.
History
Published in print: Sep 1977
Published online: Feb 12, 2021
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Authors
Affiliations
Wolfgang Faig
Assoc. Prof., Dept. of Surveying Engrg., Univ. of New Brunswick, Fredericton, N.B., Canada
Thomas Mathew
Photogrammetric Officer, Surveys and Mapping Div., Ministry of Lands, Housing and Urban Development, Oar Es Salaam, Tanzania
Sabry El Hakim
Grad. Student, Dept. of Surveying Engrg., Univ. of New Brunswick, Fredericton, N.B., Canada
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.