How Significant is the Dynamic Component of the North American Vertical Datum?
One of the main current geodetic activities in North America is the definition and establishment of a geoid-based vertical datum that will replace the official CGVD28 and NAVD88 datums in Canada and the USA, respectively. The new datum will also have a time-dependent (dynamic) component required by...
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De Gruyter
2012
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Online Access: | https://doi.org/10.2478/v10156-012-0005-7 https://doaj.org/article/c152fdd61b0e4a03a8d53b99a2e23198 |
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ftdoajarticles:oai:doaj.org/article:c152fdd61b0e4a03a8d53b99a2e23198 2023-05-15T16:22:24+02:00 How Significant is the Dynamic Component of the North American Vertical Datum? Rangelova E. Wal W. Van Der Sideris M.G. 2012-12-01T00:00:00Z https://doi.org/10.2478/v10156-012-0005-7 https://doaj.org/article/c152fdd61b0e4a03a8d53b99a2e23198 EN eng De Gruyter https://doi.org/10.2478/v10156-012-0005-7 https://doaj.org/toc/2081-9943 2081-9943 doi:10.2478/v10156-012-0005-7 https://doaj.org/article/c152fdd61b0e4a03a8d53b99a2e23198 Journal of Geodetic Science, Vol 2, Iss 4, Pp 281-289 (2012) a geoid-based vertical datum grace polar ice melt postglacial rebound temporal changes of the geoid Geodesy QB275-343 article 2012 ftdoajarticles https://doi.org/10.2478/v10156-012-0005-7 2022-12-30T23:45:37Z One of the main current geodetic activities in North America is the definition and establishment of a geoid-based vertical datum that will replace the official CGVD28 and NAVD88 datums in Canada and the USA, respectively. The new datum will also have a time-dependent (dynamic) component required by the targeted one-centimetre accuracy of the datum. Heights of the levelling benchmarks are subject to temporal changes, which contribute to the degradation of the accuracy of the datum and increase the misfit of the geoid heights determined gravimetrically and by GNSS/levelling. The zero level surface, i.e., the geoid, also changes with time, most significantly due to postglacial rebound, climate-induced loss of polar ice masses and mountain glaciers, and hydrology variations. In this study, we examine the possible changes of the datum due to the aforementioned factors. We are mostly concerned with postglacial rebound as it can contribute more than 1 mm per year and more than 1 cm per decade to the geoid change. We also assess the significance of the temporal geoid and benchmark height changes and show that, compared to its current accuracy, the geoid change is only significant after a decade mostly in the flat areas of central Canada. Article in Journal/Newspaper glacier* Directory of Open Access Journals: DOAJ Articles Canada Journal of Geodetic Science 2 4 281 289 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
a geoid-based vertical datum grace polar ice melt postglacial rebound temporal changes of the geoid Geodesy QB275-343 |
spellingShingle |
a geoid-based vertical datum grace polar ice melt postglacial rebound temporal changes of the geoid Geodesy QB275-343 Rangelova E. Wal W. Van Der Sideris M.G. How Significant is the Dynamic Component of the North American Vertical Datum? |
topic_facet |
a geoid-based vertical datum grace polar ice melt postglacial rebound temporal changes of the geoid Geodesy QB275-343 |
description |
One of the main current geodetic activities in North America is the definition and establishment of a geoid-based vertical datum that will replace the official CGVD28 and NAVD88 datums in Canada and the USA, respectively. The new datum will also have a time-dependent (dynamic) component required by the targeted one-centimetre accuracy of the datum. Heights of the levelling benchmarks are subject to temporal changes, which contribute to the degradation of the accuracy of the datum and increase the misfit of the geoid heights determined gravimetrically and by GNSS/levelling. The zero level surface, i.e., the geoid, also changes with time, most significantly due to postglacial rebound, climate-induced loss of polar ice masses and mountain glaciers, and hydrology variations. In this study, we examine the possible changes of the datum due to the aforementioned factors. We are mostly concerned with postglacial rebound as it can contribute more than 1 mm per year and more than 1 cm per decade to the geoid change. We also assess the significance of the temporal geoid and benchmark height changes and show that, compared to its current accuracy, the geoid change is only significant after a decade mostly in the flat areas of central Canada. |
format |
Article in Journal/Newspaper |
author |
Rangelova E. Wal W. Van Der Sideris M.G. |
author_facet |
Rangelova E. Wal W. Van Der Sideris M.G. |
author_sort |
Rangelova E. |
title |
How Significant is the Dynamic Component of the North American Vertical Datum? |
title_short |
How Significant is the Dynamic Component of the North American Vertical Datum? |
title_full |
How Significant is the Dynamic Component of the North American Vertical Datum? |
title_fullStr |
How Significant is the Dynamic Component of the North American Vertical Datum? |
title_full_unstemmed |
How Significant is the Dynamic Component of the North American Vertical Datum? |
title_sort |
how significant is the dynamic component of the north american vertical datum? |
publisher |
De Gruyter |
publishDate |
2012 |
url |
https://doi.org/10.2478/v10156-012-0005-7 https://doaj.org/article/c152fdd61b0e4a03a8d53b99a2e23198 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
glacier* |
genre_facet |
glacier* |
op_source |
Journal of Geodetic Science, Vol 2, Iss 4, Pp 281-289 (2012) |
op_relation |
https://doi.org/10.2478/v10156-012-0005-7 https://doaj.org/toc/2081-9943 2081-9943 doi:10.2478/v10156-012-0005-7 https://doaj.org/article/c152fdd61b0e4a03a8d53b99a2e23198 |
op_doi |
https://doi.org/10.2478/v10156-012-0005-7 |
container_title |
Journal of Geodetic Science |
container_volume |
2 |
container_issue |
4 |
container_start_page |
281 |
op_container_end_page |
289 |
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1766010371429105664 |