Modern Determination of Vertical Deflections Using Digital Zenith Cameras
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 ac...
| Main Authors: | , , , |
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| Format: | Journal Article |
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American Society of Civil Engineers
2010
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| Online Access: | http://hdl.handle.net/20.500.11937/34194 |
| _version_ | 1848754156302499840 |
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| author | Hirt, Christian Burki, B. Somieski, A. Seeber, G. |
| author_facet | Hirt, Christian Burki, B. Somieski, A. Seeber, G. |
| author_sort | Hirt, Christian |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T08:35:56Z |
| format | Journal Article |
| id | curtin-20.500.11937-34194 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:35:56Z |
| publishDate | 2010 |
| publisher | American Society of Civil Engineers |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-341942017-09-13T15:55:04Z Modern Determination of Vertical Deflections Using Digital Zenith Cameras Hirt, Christian Burki, B. Somieski, A. Seeber, G. Vertical deflection Astrogeodetic geoid determination Zenith camera Digital zenith camera system Geodetic astronomy 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. 2010 Journal Article http://hdl.handle.net/20.500.11937/34194 10.1061/(ASCE)SU.1943-5428.0000009 American Society of Civil Engineers fulltext |
| spellingShingle | Vertical deflection Astrogeodetic geoid determination Zenith camera Digital zenith camera system Geodetic astronomy Hirt, Christian Burki, B. Somieski, A. Seeber, G. Modern Determination of Vertical Deflections Using Digital Zenith Cameras |
| title | Modern Determination of Vertical Deflections Using Digital Zenith Cameras |
| title_full | Modern Determination of Vertical Deflections Using Digital Zenith Cameras |
| title_fullStr | Modern Determination of Vertical Deflections Using Digital Zenith Cameras |
| title_full_unstemmed | Modern Determination of Vertical Deflections Using Digital Zenith Cameras |
| title_short | Modern Determination of Vertical Deflections Using Digital Zenith Cameras |
| title_sort | modern determination of vertical deflections using digital zenith cameras |
| topic | Vertical deflection Astrogeodetic geoid determination Zenith camera Digital zenith camera system Geodetic astronomy |
| url | http://hdl.handle.net/20.500.11937/34194 |