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dc.contributor.authorHirt, Christian
dc.contributor.authorBurki, B.
dc.contributor.authorSomieski, A.
dc.contributor.authorSeeber, G.
dc.identifier.citationHirt, Christian and Burki, Beat and Somieski, Anna and Seeber, Guenter. 2010. Modern Determination of Vertical Deflections Using Digital Zenith Cameras. Journal of Surveying Engineering. 136 (1).

At the beginning of the 21st century, a significant technological change took place in geodetic astronomy. In Zurich and Hannover, digital zenith camera systems were developed based on digital imaging sensors (charge-coupled device) that strongly improved the degree of automation, efficiency, and accuracy of the observation of the direction of the plumb line and its vertical deflection. This paper describes the instrumental design of the new digital zenith camera systems and gives an overview of the data processing with focus on the models used for astrometric data reduction and tilt correction. Results of frequently repeated observations of vertical deflections and comparison measurements show an accuracy of vertical deflection measurements of better than 0.1 arc sec. Application examples for vertical deflection data from zenith camera observations, such as the high-precision local gravity field determination in engineering projects and gravity field validation are summarized.

dc.publisherAmerican Society of Civil Engineers
dc.subjectVertical deflection
dc.subjectAstrogeodetic geoid determination
dc.subjectZenith camera
dc.subjectDigital zenith camera system
dc.subjectGeodetic astronomy
dc.titleModern Determination of Vertical Deflections Using Digital Zenith Cameras
dc.typeJournal Article
dcterms.source.titleJournal of Surveying Engineering
curtin.departmentDepartment of Spatial Sciences
curtin.accessStatusOpen access

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