36 Result(s)
within
C. K. Shum
Earth Sciences
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Chapter
Regional Geoid Undulations from CHAMP, Represented by Locally Supported Basis Functions
Regional geoid undulations are determined from CHAMP data using various locally supported basis functions to assess their respective efficiency, accuracy and multi-resolution representation properties. These f...
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Chapter
Potential Contribution of CHAMP Occultation to Pressure Field Improvement for Gravity Recovery
This paper studies one aspect of use of the CHAMP GPS occultation data, namely the improvement of the atmospheric pressure field, particularly over Antarctica. Previous studies indicate that pressure differenc...
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Chapter and Conference Paper
Multiresolution representation of a regional geoid from satellite and terrestrial gravity data
In this paper we present results from modeling the Earth’s gravitational field over the northern part of South-America using spherical wavelets. We have applied our analysis to potential data that we derived f...
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Chapter and Conference Paper
Towards the Estimation of a Multi-Resolution Representation of the Gravity Field Based on Spherical Wavelets
Usually the gravity field of the Earth is modeled by means of a series expansion in terms of spherical harmonics. However, the computation of the series coefficients requires preferably homogeneous distributed...
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Chapter
CHAMP Gravity Field Solutions and Geophysical Constraint Studies
We report results on the use of CHAMP observations for Earth's mean and time-varying gravity field solutions and the associated geophysical interpretation. 1.5 years of CHAMP data from May 2001 through Februar...
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Chapter
Recovery of Isostatic Topography over North America from Topographic and CHAMP Gravity Correlations
We investigate North American crustal structure and mass loads from spectral correlation analysis of topographic, CHAMP and terrestrial gravity data. We use free-air and terrain gravity correlations to isolate...
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Chapter and Conference Paper
Extreme Southern Ocean Tide Modeling
Predictability of barotropic ocean tides is significantly less accurate in the coastal regions, littoral and shallow seas, and oceans not covered by TOPEX/POSEIDON (T/P) than in deep oceans (>1000 m depth) wit...
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Chapter and Conference Paper
Calibration Results of GFO
GFO has been operational since November 2000 and it’s data products are available to the scientific community. This paper provides a summary of the GFO calibration and sensor validation results, and presents r...
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Article
Seasonal sea level change from TOPEX/Poseidon observation and thermal contribution
Seasonal steric sea-level change due to temperature variation in the mixing layer is assessed using space-measured sea-surface temperature data and historical in situ temperature measurements. The results are...
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Chapter and Conference Paper
Geodetic Applications of the ROCSAT-3/COSMIC Mission
The jointly planned Taiwan-US space mission ROCSAT-3/COSMIC (Constellation Observing System for Meteorology, Ionosphere and Climate) is scheduled for launch in 2001. A 6–8 low Earth orbiting satellite constell...
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Article
Robust estimation of systematic errors of satellite laser range
Methods for analyzing laser-ranging residuals to estimate station-dependent systematic errors and to eliminate outliers in satellite laser ranges are discussed. A robust estimator based on an M-estimation pri...
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Chapter and Conference Paper
Observed Temporal Variations in the Earth’s Gravity Field from 16-year Starlette Orbit Analysis
Satellite laser ranging data to Starlette, collected during the period from 1975 to 1990, have been analyzed to determine yearly values of the second degree annual (S a ...
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Chapter and Conference Paper
A General Ocean Circulation Model Determined in a Simultaneous Solution with the Earth’s Gravity Field
Over the past several years, determination of the sea surface topography using satellite altimetry has been greatly improved due to the implementation of a technique which simultaneously solves for the sea sur...
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Chapter and Conference Paper
An Improved Model for the Earth’s Gravity Field
Precision orbit determination methods, along with a new technique to compute relative data weights, have been applied to the determination of the Earth’s gravity field and other geophysical parameters from the...
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Chapter and Conference Paper
Chapter 6 data analysis
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Article
Digitized global land-sea map and access software
A computer-efficient global data file, which contains digitized information that enables identification of a given latitude/longitude defined point as over land or over water, was generated from a data base wh...
