Results 41 to 50 of about 285 (165)

CORRECTION TO HELMERT'S ORTHOMETRIC HEIGHT DUE TO ACTUAL LATERAL VARIATION OF TOPOGRAPHICAL DENSITY [PDF]

Revista Brasileira de Cartografia, 2003
Helmert (1890) used Poincaré-Prey's gravity gradient for the definition of the orthometric height. According to this approach the gravity value needed for the evaluation of the height is obtained from the observed gravity at the earth surface reduced to ...
Petr Vanícek, Robert Tenzer
doaj  

Comparative Analysis of Change between Ellipsoidal Height Differences and Equivalent Orthometric Height Difference

Ghana Journal of Geography, 2020
Height is an important component in the determination of the position of a point. The study aimed at performing a comparative analysis of change between ellipsoidal height differences and the equivalent orthometric height difference of points. A hi-target Differential Global Positioning System (DGPS) was used to acquire GPS data with an occupation ...
Tata Herbert, Raufu Ibrahim Olatunji
openaire   +2 more sources

Marine‐Sourced Sediment Supply Supports Salt Marsh Resilience to Sea Level Rise in the Northeastern US

Geophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract Salt marshes rely on sediment to maintain elevation and resist sea level rise (SLR). While riverine sediment is well studied, marine‐sourced sediment remains understudied, particularly in regions with limited river input. We examined the influence of marine‐sourced sediment on salt marsh stability across 103 sites in the Northeastern US, using
Wenxiu Teng, Brian Yellen, Qian Yu, Neil K. Ganju, Erin K. Peck, Tim Cook, Jonathan D. Woodruff   +6 more
wiley   +1 more source

Calculating of adjusted geoid undulation based on EGM08 and mean sea level for different regions in Iraq

MATEC Web of Conferences, 2018
In last decades Global Navigation Satellite System (GNSS) or as known Global Positioning System (GPS) technique is considered a revolutionary technique in the field of geodetic survey in comparison with traditional techniques (level, theodolite and total
Fanos Ali, Tahir Rusul, Mohammed Suad, Mahmood May   +3 more
doaj   +1 more source

Geoid heights in Costa Rica, Case of Study: Baseline Along the Central Pacific Zone

Ingeniería, 2019
A precise orthometric height (H) and orthometric height difference (ΔH) determination is required in many fields like construction, geodesy and geophysics.
Alonso Vega Fernádez, Oscar Lücke Castro, Ph. D., Jaime Garbanzo Leon, M. Sc.   +2 more
doaj   +1 more source

Analyzing Synthetic Stage‐Discharge Rating Curves and Riverine Flood Inundation Maps Derived From Global‐Scale Hydrologic and Hydraulic Modeling

Journal of Flood Risk Management, Volume 18, Issue 4, December 2025.
ABSTRACT Synthetic rating curves (SRCs) are often used to translate streamflow forecasts into flood inundation maps. Previous studies have investigated the development and errors in SRCs at local, regional, and continental scales. In this analysis, we used the latest global methodology and datasets to develop SRCs for use in flood inundation map ...
Joseph L. Gutenson, Michael L. Follum, Kathleen A. Staebell, Emily S. Ondich, Mark D. Wahl   +4 more
wiley   +1 more source

Separation Between Geoid and Quasi-Geoid: Analysis of the Differences Between Normal-Orthometric and Rigorous Orthometric Heights

Anuário do Instituto de Geociências - UFRJ, 2018
The orthometric and normal heights are the two altitude systems most used in the practical realization of the local and national vertical geodesic data. The main difference between these two concepts is that the actual mean gravity along the plumb line between the geoid and the topographic surface theoretically defines the orthometric heights, as well ...
Fabio Luiz Albarici, Gabriel Nascimento Guimarães, Ismael Foroughi, Marcelo Santos, Jorge Luiz Alves Trabanco   +4 more
openaire   +3 more sources

Deriving Intertidal Topography From SWOT Data and Sentinel‐2 Data

Geophysical Research Letters, Volume 52, Issue 21, 16 November 2025.
Abstract The Surface Water and Ocean Topography (SWOT) mission, initially designed to observe oceans and inland waters, proves valuable for mapping intertidal flat topography. This study presents a fusion method that integrates freely available SWOT interferometric altimetry data with Sentinel‐2 imagery.
Mingzhi Sun, Wei Feng, Xudong Wang, Nan Xu, Fukai Peng, Xiaodong Chen, Dechao An, Luciana Fenoglio, Meng Yang, Min Zhong   +9 more
wiley   +1 more source

Impact of SRTM and ASTER Terrain Models on Geoid Determination: A Case Study in the High‐Mountainous Region

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract An accurate geoid has important consequences for many fields such as engineering applications, underground resource exploration, geophysical surveys, etc. Its precise determination relies on two key data sets: gravity measurements and high‐resolution elevation data, both of which are critical for achieving reliable results.
Leyla Cakir
wiley   +1 more source

Assessments of recent Global Geopotential Models based on GPS/levelling and gravity data along coastal zones of Egypt

Open Geosciences, 2023
The orthometric height has an essential role in a variety of civil engineering projects and it is defined as the length of the curved plumbline from a point (on the earth surface) to its intersection with the geoid surface. Leveling process is considered
Al Shouny Ahmed, Khalil Ragab, Kamel Abdullah, Miky Yehia   +3 more
doaj   +1 more source