Results 211 to 220 of about 1,421,677 (272)

Establishment of Seamless Chart Datum and Vertical Datum Transformation for Hydrography with a Combining Geoid, Sea Surface Topography, and Ocean Tide Model in Prydz Bay, Antarctica

Journal of Coastal Research, 2020
Ke, H.; Wang, A.; Lei, J.; Wu, J.; Wang, Z., and Zhang, S., 2020. Establishment of seamless chart datum and vertical datum transformation for hydrography with a combining geoid, sea surface topography, and ocean tide model in Prydz Bay, Antarctica.
Hao Ke, Aixue Wang, Jintao Lei, Jingwen Wu, Zemin Wang, Shengkai Zhang   +5 more
semanticscholar   +1 more source

Tidal Datum Modeling in Support of NOAA's Vertical Datum Transformation Tool

Estuarine and Coastal Modeling (2005), 2006
Many coastal modeling applications rely on accurate bathymetry and/or topography data. The best data sets are often synthesized products with data collected from several sources which may be referenced to different vertical datums including Mean Low Water (MLW), Mean Lower Low Water (MLLW), North American Verical Datum of 1988 (NAVD 88), and others ...
Emily Spargo, Kurt Hess, Edward Myers, Zhizhang Yang, Adeline Wong   +4 more
openaire   +1 more source

Global gravity models and the Ghanaian Vertical Datum: challenges of a proper definition

Survey Review, 2019
This paper analyzes errors in satellite gravity and GPS/trigonometric benchmarks (BMs) in relation to defining the Ghanaian Vertical Datum (GhVD). Results indicate that synthesized gravity introduce approximately 5 mm of error to corrected heights ...
C. Kelly, S. A. Andam-Akorful, C. Hancock, P. Laari, J. Ayer   +4 more
semanticscholar   +1 more source

Quality investigation of vertical height datum connection

Physics and Chemistry of the Earth, 1998
Abstract Usually, vertical datums have been defined by averaging sea level observations at one or more fundamental tide gauges. Since mean sea level is not an equipotential surface, different vertical datums refer to different equipotential surfaces, resulting in constant off-sets between different height datum zones.
K. van Olsen, M. van Gelderen
openaire   +1 more source

Multiple incompatible datum points identification in vertical control network for high-speed railway based on likelihood ratio test

Journal of Applied Geodesy, 2021
The high-speed railway (HSR) surveying system in China has developed into a modern large-scale precision surveying system with multi-stage structure, large scale, and high precision and reliability requirements.
Guangfeng Yan, Yangtenglong Li, Chunyan Liu   +2 more
semanticscholar   +1 more source

Horizontal and Vertical Geodetic Datums

1989
In conventional geodetic systems, locations of points on the surface of the earth may be defined either by means of natural (astronomic) or geometric (geodetic) coordinates. The natural coordinates, the astronomic latitude (Φ), longitude (Λ), and the orthometric (mean sea level height (H), being gravity dependent, are conventionally referenced to the ...
Ivan I. Mueller, Richard H. Rapp
openaire   +1 more source

Tide Level Measurements and Vertical Datum Conversion

2020
Measuring sea level is fundamentally problem of geoscience and business activities. In this chapter we will first introduce the basic equipment and principles of sea level measurement. We then discuss analysis and forecast of tide level .We explain water level corrections vertical data and transformation while those considerations should be taken into ...
Ziyin Wu, Fanlin Yang, Yong Tang
openaire   +1 more source

Height discrepancies based on various vertical datum

2012 IEEE Control and System Graduate Research Colloquium, 2012
A vertical datum is the core information needed in deriving height or elevation of points on the surface of the earth. This information used as a starting point or zero value of height. Currently, various vertical datum used as a zero level in determination of height and depth in Peninsular Malaysia.
Saiful Aman Hj Sulaiman, Kamaluddin Hj Talib, Mat Akhir Md Wazir, Othman Mohd Yusof, Shafiq Azwan Zalil   +4 more
openaire   +1 more source

Altimetry-gravimetry problems with free vertical datum

Journal of Geodesy, 2000
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +2 more sources

A Global Vertical Reference Frame Based on Four Regional Vertical Datums

Studia Geophysica et Geodaetica, 2004
A Global Vertical Reference Frame (GVRF) has been realized by means of several regional and local vertical datums (LVD) distributed world-wide: the North American Vertical Datum 1988 (NAVD 88), Australian Height Datum 1971 (AHD 71), LVD France, Institute Geographique National 1969 (IGN 69) and Brazilian Height Datum 1957 (BHD 57).
M. Burša, S. Kenyon, J. Kouba, Z. Šíma, V. Vatrt, M. Vojtíšková   +5 more
openaire   +1 more source