Journal of Geodesy

Items from 1 to 20 out of 41 results

article

High-resolution regional geoid computation without applying Stokes’s formula: a case study of the Iranian geoid

A. A. Ardalan, E. W. Grafarend

Journal of Geodesy > 2004 > 78 > 1-2 > 138-156

. A new theory for high-resolution regional geoid computation without applying Stokes’s formula is presented. Operationally, it uses various types of gravity functionals, namely data of type gravity potential (“gravimetric leveling”), vertical derivatives of the gravity potential (“modulus of gravity intensity from gravimetric surveys”), horizontal derivatives of the gravity potential (“vertical deflections...

article

The effect on the geoid of lateral topographic density variations

L. E. Sjöberg

Journal of Geodesy > 2004 > 78 > 1-2 > 34-39

. Gravimetric geoid determination by Stokes’ formula requires that the effects of topographic masses be removed prior to Stokes integration. This step includes the direct topographic and the downward continuation (DWC) effects on gravity anomaly, and the computations yield the co-geoid height. By adding the effect of restoration of the topography, the indirect effect on the geoid, the geoid height...

article

Computing geodetic coordinates from geocentric coordinates

H. Vermeille

Journal of Geodesy > 2004 > 78 > 1-2 > 94-95

. A closed-form algebraic method to transform geocentric coordinates to geodetic coordinates has previously been proposed. The validity domain of latitude and height formulae in the vicinity of the Earth’s core is specified. A new expression of longitude is proposed, excluding indetermination and sensitivity to round-off error around the ±180 degrees longitude discontinuity.

article

Transformation of coordinates using piecewise conformal mapping

J. Lippus

Journal of Geodesy > 2004 > 78 > 1-2 > 40-46

. A multiresolution-like algorithm for piecewise conformal mapping is presented. The algorithm is based on partitioning the complex plane into convex polygons, defining appropriate window functions for these polygons, and finding a conformal mapping for each polygon. The window functions are used to glue the pieces together into a single mapping. An application of this algorithm to determine a transformation...

article

A comparison of methods for the inversion of airborne gravity data

B. Alberts, R. Klees

Journal of Geodesy > 2004 > 78 > 1-2 > 55-65

. Four integral-based methods for the inversion of gravity disturbances, derived from airborne gravity measurements, into the disturbing potential on the Bjerhammar sphere and the Earth’s surface are investigated and compared with least-squares (LS) collocation. The performance of the methods is numerically investigated using noise-free and noisy observations, which have been generated using a synthetic...

article

lAG Newsletter

Gyula Tóth, C.C. Tscherning

Journal of Geodesy > 2004 > 78 > 1-2 > 157-165

Books for review are the responsibility of:

article

Prediction of Earth rotation parameters by fuzzy inference systems

O. Akyilmaz, H. Kutterer

Journal of Geodesy > 2004 > 78 > 1-2 > 82-93

. The short-term prediction of Earth rotation parameters (ERP) (length-of-day and polar motion) is studied up to 10 days by means of ANFIS (adaptive network based fuzzy inference system). The prediction is then extended to 40 days into the future by using the formerly predicted values as input data. The ERP C04 time series with daily values from the International Earth Rotation Service (IERS) serve...

article

A technique for modeling the Earth’s gravity field on the basis of satellite accelerations

P. Ditmar, A. A. van Eck van der Sluijs

Journal of Geodesy > 2004 > 78 > 1-2 > 12-33

. A technique is proposed for Earth’s gravity field modeling on the basis of satellite accelerations that are derived from precise orbit data. The functional model rests on Newton’s second law. The computational procedure is based on the pre-conditioned conjugate-gradient (PCCG) method. The data are treated as weighted average accelerations rather than as point-wise ones. As a result, a simple three-point...

article

First-order design of geodetic networks using the simulated annealing method

J. L. Berné, S. Baselga

Journal of Geodesy > 2004 > 78 > 1-2 > 47-54

. The general problem of the optimal design for a geodetic network subject to any extrinsic factors, namely the first-order design problem, can be dealt with as a numeric optimization problem. The classic theory of this problem and the optimization methods are revised. Then the innovative use of the simulated annealing method, which has been successfully applied in other fields, is presented for this...

article

Calibration of GOCE SGG data using high–low SST, terrestrial gravity data and global gravity field models

J. Bouman, R. Koop, C. C. Tscherning, P. Visser

Journal of Geodesy > 2004 > 78 > 1-2 > 124-137

. It is the aim of the GOCE mission to determine a model of the Earth’s gravity field with high accuracy and resolution. For this purpose, gravity gradients will be measured in combination with high–low satellite-to-satellite tracking. The gravity gradients are derived from pair-wise differenced accelerations as determined by the six three-axes accelerometers that form the GOCE gradiometer. Since...

article

Ellipsoidal terrain correction based on multi-cylindrical equal-area map projection of the reference ellipsoid

A. A. Ardalan, A. Safari

Journal of Geodesy > 2004 > 78 > 1-2 > 114-123

. An operational algorithm for computation of terrain correction (or local gravity field modeling) based on application of closed-form solution of the Newton integral in terms of Cartesian coordinates in multi-cylindrical equal-area map projection of the reference ellipsoid is presented. Multi-cylindrical equal-area map projection of the reference ellipsoid has been derived and is described in detail...

article

Introduction by the new Editor-in-Chief

W.E. Featherstone

Journal of Geodesy > 2004 > 78 > 1-2 > 1-6

Acknowledgements. I would like to thank the members of the current and previous Editorial Board that gave very useful input to the philosophy and new procedures for J Geod.

article

Integrated adjustment of CHAMP, GRACE, and GPS data

S. Zhu, Ch. Reigber, R. König

Journal of Geodesy > 2004 > 78 > 1-2 > 103-108

. Various types of observations, such as space-borne Global positioning system (GPS) code and phase data, accelerometer data, K-band range and range-rate data, and ground-based satellite laser ranging data of the CHAllenging Minisatellite Payload (CHAMP) and GRAvity Climate Experiment (GRACE) satellite missions, are used together with ground-based GPS code and phase data in a rigorous adjustment to...

article

Short Note: Asymptotic theory for calculating deformations caused by dislocations buried in a spherical earth — gravity change

W. Sun

Journal of Geodesy > 2004 > 78 > 1-2 > 76-81

. An asymptotic theory is presented for calculating co-seismic gravity changes, as a complement to a previous article by Sun [J Geod (2003) 77:381–387)], which presents the asymptotic theory for co-seismic geoid changes. Only the important formulas and results are summarized here; all the concepts and conventions are the same as for the companion paper. The theory is given by closed mathematical expressions...

article

Spherical harmonic analysis of the CRUST 2.0 global crustal model

D. Tsoulis

Journal of Geodesy > 2004 > 78 > 1-2 > 7-11

. The spherical harmonic analysis of the 2^∘×2^∘ density and stratification information contained in the global crustal model CRUST 2.0 is presented from the viewpoint of gravity field recovery and interpretation. Using a standard Airy/Heiskanen (A/H) isostatic hypothesis and a radially distributed compensation mechanism, two models of topographic/isostatic (t/i) potential harmonic coefficients are...

article

The Null method applied to GNSS three-carrier phase ambiguity resolution

U. Fernández-Plazaola, T. M. Martín-Guerrero, J. T. Entrambasaguas-Muñoz, M. Martín-Neira

Journal of Geodesy > 2004 > 78 > 1-2 > 96-102

. The Null method is a technique to fix the ambiguity in L1 phase measurements of the global positioning system (GPS). The method is adapted to new global navigation satellite systems (GNSS) which offer phase measurements at three frequencies. In order to validate the efficiency of the adapted method, results obtained using a software simulator and an emulator are presented. The results are then compared...

article

Excitation of non-atmospheric polar motion by the migration of the Pacific Warm Pool

Y. H. Zhou, X. H. Yan, X. L. Ding, X. H. Liao, more

Journal of Geodesy > 2004 > 78 > 1-2 > 109-113

. Changes in the annual variation of the Earth’s polar motion are found to be largely caused by the variation of the atmospheric angular momentum (AAM). Recent simulation results of oceanic general circulation models further suggest global oceanic effects on the annual polar motion in addition to the atmosphere. In comparison with previous model studies of global oceanic effects, this research particularly...

article

Two-step procedures for hybrid geoid modelling

L. E. Sjöberg, W. E. Featherstone

Journal of Geodesy > 2004 > 78 > 1-2 > 66-75

. A variety of mathematical models exist with which to combine long-wavelength geoid information from an Earth gravity model (EGM) with terrestrial gravity data. As new data become available, such as an extended or refined EGM and/or some variance–covariance information from terrestrial gravity data, this new information can be combined with a previous geoid model through a so-called hybrid estimator...

article

A spherical harmonic representation of the ellipsoidal correction to the modified Stokes formula

L. E. Sjöberg

Journal of Geodesy > 2004 > 78 > 3 > 180-186

. Ellipsoidal corrections to order e ² of the original and the modified Stokes formulas are presented in series of spherical harmonics. Numerical tests show that the ellipsoidal effect can reach several decimetres for an integration cap size of 10^∘ in Stokes’ formula.

article

A study of gravity variations caused by polar motion using superconducting gravimeter data from the GGP network

J.-Q. Xu, H.-P. Sun, X.-F. Yang

Journal of Geodesy > 2004 > 78 > 3 > 201-209

. Long-term continuous gravity observations, recorded at five superconducting gravimeter (SG) stations in the Global Geodynamic Project (GGP) network, as well as data on orientation variations in the Earth’s rotation axis (i.e. polar motion), have been used to investigate the characteristics of gravity variations on the Earth’s surface caused by polar motion. All the SG gravity data sets were pre-processed...

Year:
2004

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Volume

78 (41)

Keywords

GEOID (5)
GLOBAL POSITIONING SYSTEM (3)
POLAR MOTION (3)
ANALYTICAL INVERSE (2)
COVARIANCE MATRIX (2)
EARTH ROTATION (2)
ELLIPSOIDAL CORRECTION (2)
GEOID DETERMINATION (2)
GRAVITY FIELD (2)
ISOSTASY (2)
KRONECKER PRODUCT (2)
MATRIX INVERSION (2)
MODIFIED STOKES’ FORMULA (2)
MULTI-DIFFERENCE (2)
SATELLITE-TO-SATELLITE TRACKING (2)
TOEPLITZ MATRIX (2)
VARIANCE (2)
ACCURACY (1)
AIRBORNE GRAVIMETRY (1)
AMBIGUITY RESOLUTION (1)
ANALYTICAL CONTINUATION (1)
ANGULAR ROTATION (1)
APPROXIMATION (1)
ASYMPTOTIC (1)
CALIBRATION (1)
CHALLENGING MINISATELLITE PAYLOAD (1)
CHAMP (1)
CHANDLER WOBBLE (1)
CLASSICAL GEODESY (1)
CO-SEISMIC GRAVITY CHANGE (1)
COLOURED NOISE (1)
COMBINATION (1)
CONFORMAL MAPPING (1)
COORDINATE TRANSFORMATION (1)
CORE (1)
D-OPTIMALITY (1)
DATUM DEFINITION (1)
DE-SPINNING (1)
DEFORMATION (1)
DELAUNAY TRIANGULATION (1)
DIFFERENCE (1)
DISLOCATION THEORY (1)
DOUBLE (1)
DOUBLE DIFFERENCE (1)
DOWNWARD CONTINUATION (1)
DYNAMIC TOPOGRAPHY (1)
EARTH’S GRAVITY FIELD (1)
ELASTO-GRAVITATIONAL DEFORMATION (1)
ELLIPSOIDAL APPROXIMATION (1)
ELLIPSOIDAL BOUNDARY-VALUE PROBLEM (1)
ELLIPSOIDAL BRUNS FORMULA (1)
EXCITATION (1)
FIRST-ORDER DESIGN (1)
FREE AIR ANOMALY (1)
FUZZY INFERENCE SYSTEMS (1)
GEOCENTRIC COORDINATES (1)
GEODETIC COORDINATES (1)
GEODETIC NETWORK (1)
GEODETIC NETWORK ADJUSTMENT (1)
GEODETIC NETWORKS (1)
GEOMETRIC DATA STRUCTURE (1)
GEOPOTENTIAL MODEL (1)
GEOSTROPHIC PRESSURE (1)
GLOBAL CRUSTAL MODELS (1)
GLOBAL GEO- DYNAMIC PROJECT (1)
GLOBAL GRAVITY MODEL (1)
GLOBAL NAVIGATION SATELLITE SYSTEM AMBIGUITY RESOLUTION (1)
GLOBAL NAVIGATION SATELLITE SYSTEMS (1)
GLOBAL SPHERICAL HARMONIC ANALYSIS (1)
GOCE (1)
GPS (1)
GRADIOMETRY (1)
GRAVIMETRIC PARA- METERS (1)
GRAVIMETRY (1)
GRAVITY AND CLIMATE EXPERIMENT (1)
GRAVITY FIELD AND STEADY-STATE OCEAN CIRCULATION EXPLORER (GOCE) (1)
GRAVITY FIELD DETERMINATION (1)
GRAVITY FIELD MODELING (1)
HELMERT’S CONDENSATION METHOD (1)
HYBRID LEARNING (1)
HYBRID MODIFICATION (1)
INDIRECT EFFECTS (1)
INTEGER APERTURE ESTIMATION (1)
INTEGER ESTIMATION (1)
INTERNATIONAL TERRESTRIAL REFERENCE FRAME (1)
ISOSTATIC GEOID (1)
ISOSTATIC GRAVITY (1)
KALMAN FILTERING (1)
LATERAL DENSITY ANOMALY (1)
LEAST-SQUARES MODIFICATION (1)
LITHOSPHERE (1)
LOCAL TIES (1)
MANTLE BOUNDARY (CMB) FLOWS (1)
NULL METHOD (1)
OCEAN LOADING (1)
OPTIMIZATION (1)
PENALIZED AMBIGUITY RESOLUTION (1)
POLAR MOMENT OF INERTIA (1)
POLAR MOTION EXCITATION (1)
PRECISE ORBIT DETERMINATION (1)
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INFONA - science communication portal

Journal of Geodesy

High-resolution regional geoid computation without applying Stokes’s formula: a case study of the Iranian geoid

The effect on the geoid of lateral topographic density variations

Computing geodetic coordinates from geocentric coordinates

Transformation of coordinates using piecewise conformal mapping

A comparison of methods for the inversion of airborne gravity data

lAG Newsletter

Prediction of Earth rotation parameters by fuzzy inference systems

A technique for modeling the Earth’s gravity field on the basis of satellite accelerations

First-order design of geodetic networks using the simulated annealing method

Calibration of GOCE SGG data using high–low SST, terrestrial gravity data and global gravity field models

Ellipsoidal terrain correction based on multi-cylindrical equal-area map projection of the reference ellipsoid

Introduction by the new Editor-in-Chief

Integrated adjustment of CHAMP, GRACE, and GPS data

Short Note: Asymptotic theory for calculating deformations caused by dislocations buried in a spherical earth — gravity change

Spherical harmonic analysis of the CRUST 2.0 global crustal model

The Null method applied to GNSS three-carrier phase ambiguity resolution

Excitation of non-atmospheric polar motion by the migration of the Pacific Warm Pool

Two-step procedures for hybrid geoid modelling

A spherical harmonic representation of the ellipsoidal correction to the modified Stokes formula

A study of gravity variations caused by polar motion using superconducting gravimeter data from the GGP network

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