Results 11 to 20 of about 2,632 (195)

IMPORTANCE OF PRECISE GRAVITY FIELD MODELING IN DIRECT GEOREFERENCING AND AERIAL PHOTOGRAMMETRY: A CASE STUDY FOR SWEDEN [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2022
Direct georeferencing of airborne mobile mapping systems is developing with unprecedented speed using GNSS/INS integration. Removal of systematic errors is required for achieving a high accurate georeferenced product in mobile mapping platforms with ...
M. Bagherbandi, M. Bagherbandi, A. Jouybari, F. Nilfouroushan, F. Nilfouroushan, J. Ågren, J. Ågren   +6 more
doaj   +1 more source

Performance evaluation of high/ultra-high-degree global geopotential models over Vietnam using GNSS/leveling data

Geodesy and Geodynamics, 2023
The availability of many high-degree Global Geopotential Models (GGMs), namely EGM2008, EIGEN-6C4, GECO, SGG-UGM-1, SGG-UGM-2, XGM2019e_2159, and GGMPlus, challenges users regarding which model is best for Vietnam.
Hoa Thi Pham, Sten Claessens, Michael Kuhn, Joseph Awange   +3 more
doaj   +1 more source

THE DEVELOPMENT AND VALIDATION OF AN EGM2008 GEOID MODEL FOR SENEGAL. [PDF]

International Journal of Advanced Research, 2019
In Senegal, the use of GPS Global Navigation Satellite Systems (GNSS) technology to give a planimetric position on the WGS84 ellipsoid has increased considerably in recent decades. However, the problem of altitude posed by this technology presents the engineers a complex obstacle, since it is necessary to determine with precision the orthometric ...
Alassane Ba, Ababacar Fall, Papa Babacar Diop Thioune And El Hadji Bamba Diaw.   +1 more
openaire   +2 more sources

Performance Comparison of Geoid Refinement between XGM2016 and EGM2008 Based on the KTH and RCR Methods: Jilin Province, China

Remote Sensing, 2020
The selection of an appropriate global gravity field model and refinement method can effectively improve the accuracy of the refined regional geoid model in a certain research area.
Qiong Wu, Hongyao Wang, Bin Wang, Shengbo Chen, Hongqing Li   +4 more
doaj   +1 more source

Refinement of Bouguer anomalies derived from the EGM2008 model, impact on gravimetric signatures in mountainous region: Case of Cameroon Volcanic Line, Central Africa

Earth and Planetary Physics, 2020
Global geopotential models have not included the very high frequencies of the Earth’s external gravity field. This is called omission error. This omission error becomes more important in mountainous areas (areas with highly variable topography). The work
Paul Gautier Kamto, Cyrille Mezoue Adiang, Severin Nguiya, Joseph Kamguia, Loudi Yap   +4 more
doaj   +1 more source

Evaluation of the recent high-degree combined global gravity-field models for geoid modelling over Kenya

Geodesy and Cartography, 2020
This study carries out an evaluation of the recent high-degree combined global gravity-field models (EGM2008, EIGEN-6C4, GECO and SGG-UGM-1) over Kenya. The evaluation is conducted using observed geoid undulations (18 data points, mainly in Nairobi area)
Patroba Achola Odera
doaj   +1 more source

ADAPTATION OF THE GLOBAL GEOID MODEL EGM2008 ON CAMPANIA REGION (ITALY) BASED ON GEODETIC NETWORK POINTS [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2021
Abstract. The knowledge of the geoid undulation, the height of the geoid relative to a given ellipsoid of reference, is fundamental to transform the ellipsoidal heights into orthometric heights. Global geoid undulation models developed from satellite gravity measurements appropriately integrated with other data, are free accessible in internet, but ...
Ferrara G., Parente C.
openaire   +4 more sources

Lithospheric 3D gravity modelling using upper-mantle density constraints: Towards a characterization of the crustal configuration in the North Patagonian Massif area, Argentina [PDF]

, 2017
The North Patagonian Massif is an Argentinean plateau that has an average height of 1200 m and stands from 500 to 700 m above the neighboring areas. During Paleogene, it suffered a sudden uplift of more than 1200 m without noticeable internal deformation;
Aragon, Eugenio, Gómez Dacal, María Laura, Ponce, Alexis Daniel, Scheck Wenderoth, Magdalena, Sippel, Judith, Tocho, Claudia   +5 more
core   +2 more sources

Impact of datum transformation on local variations of geometric geoid in Niger

Geodesy and Cartography, 2017
In this study, we have conducted an investigation on the impact of the coordinates’ transformation on local variations of geometric geoid. The study area is limited by 1°43′12″ to 4°00′37″ East and 13°01′57″ to 14°31′20″ North in the southwest of the ...
Salissou Ibrahim Yahaya, El Hassan El Brirchi, Driss El Azzab   +2 more
doaj   +1 more source

Evaluation of GOCE-based global gravity field models over Japan after the full mission using free-air gravity anomalies and geoid undulations

Earth, Planets and Space, 2017
The performance of Gravity field and steady-state Ocean Circulation Explorer (GOCE) global gravity field models (GGMs), at the end of GOCE mission covering 42 months, is evaluated using geoid undulations and free-air gravity anomalies over Japan ...
Patroba Achola Odera, Yoichi Fukuda
doaj   +1 more source