Results 31 to 40 of about 914 (138)
The Geodetic Infrastructure of Ungheni District of the Republic of Moldova
Bulletin of the Polytechnic Institute of Jassy: Constructions, Architechture Section, 2021 Starting from 1999 a new geodetic reference system MOLDREF99 based on the ITRF97 and ETRS89 was established in Republic of Moldova. The realization of MOLDREF99 is the national GNSS Network with density about 1 point per 15 sq. km.
Chiriac Vasile, Nuca Dumitru
doaj +1 more source
Utilisation of Fast Fourier Transform and Least-squares Modification of Stokes formula to compile approximate geoid heights over Khartoum State: Sudan [PDF]
, 2016 We use Fast Fourier Transform (FFT) and Least-squares modification (LSM) of Stokes formula to compute the approximate geoid over Khartoum State in Sudan.
Abdalla, A, Green, CM
core +1 more source
Remote Sensing, 2021 This article concerns the development of gravimetric quasigeoid and geoid models using the geophysical gravity data inversion technique (the GGI method).
Marek Trojanowicz +3 more
doaj +1 more source
Improvement of the accuracy of the quasigeoid model VIGAC2017 [PDF]
VIETNAM JOURNAL OF EARTH SCIENCES, 2017 As mentioned in (Ha Minh Hoa, 2017), a national spatial reference system will be constructed based on a highly accurate national quasigeoid model with accuracy more than 4 cm. In Vietnam at the present stage there isn’t a detailed gravimetric measurement
Hoa, Ha Minh
openaire +3 more sources
On the geoid and orthometric height vs. quasigeoid and normal height
Journal of Geodetic Science, 2018 The geoid, but not the quasigeoid, is an equipotential surface in the Earth’s gravity field that can serve both as a geodetic datum and a reference surface in geophysics. It is also a natural zero-level surface, as it agrees with the undisturbed mean sea
Sjöberg Lars E.
doaj +1 more source
The quasigeoid modelling in New Zealand using the boundary element method
Contributions to Geophysics and Geodesy, 2010 We compile a quasigeoid model at the study area of New Zealand using the boundary element method (BEM). The direct BEM formulation for the Laplace equation is applied to obtain a numerical solution to the linearized fixed gravimetric boundaryvalue ...
Robert ČUNDERLÍK +3 more
doaj +1 more source
Remote Sensing, 2020 A vertical offset model for Vietnam and its surrounding areas was determined based on the differences between height anomalies derived from 779 Global Navigation Satellite System (GNSS)/levelling points and those derived from a dedicated high-resolution ...
Dinh Toan Vu +4 more
doaj +1 more source
A crossvalidation-based comparison of kriging and IDW in local GNSS/levelling quasigeoid modelling
Reports on Geodesy and Geoinformatics, 2022 This study compares two interpolation methods in the problem of a local GNSS/levelling (quasi) geoid modelling. It uses raw data, no global geopotential model is involved.
Ligas Marcin +2 more
doaj +1 more source
TanDEM-X for Large-Area Modeling of Urban Vegetation Height: Evidence from Berlin, Germany [PDF]
, 2016 —Large-area urban ecology studies often miss information on vertical parameters of vegetation, even though they represent important constituting properties of complex urban ecosystems.
Geiß, Christian +2 more
core +1 more source
The quality role of height system and geoid model in the realization of GNSS heighting [PDF]
, 2011 This paper presents a quality analysis and comparison of two height reference surfaces. The first is the actual geoid model from the year 2000, and the second is the test geoid model determined in the frame of the project Establishment of the European ...
Berk, Sandi +5 more
core +1 more source