Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 110 for “"altimetry"”.
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Electromagnetic bias in Geosat altimetry
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1991.
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Ocean Tides Modeling using Satellite Altimetry
… coastal regions. Advances in satellite radar altimetry technology enabled a globally sampled record of sea surface height (SSH) and its changes over the past two decades, particularly after the launch of TOPEX/POSEIDON satellite. This geophysical record enables numerous scientific studies or …
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Combining altimetry and hydrography with inverse methods
… Real-time ‘float’ observations and satellite altimetry measurements are used to map a ‘sea surface elevation’ to study the large-scale ocean circulation in the North Atlantic. The inverse has been applied to simulated Argo floats and satellite altimetry tracks in the Ocean Circulation and …
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Atmospheric delay modeling for satellite laser altimetry
… and Land Elevation Satellite (ICESat) is a laser altimetry mission with the primary purpose of measuring the mass balance of the ice sheets of Greenland and Antarctica. It will provide 5 years of topography measurements of the ice, as well as land and ocean topography. In order to accurate …
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Electromagnetic bias in radar altimetry at microwave frequencies
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1992.
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Land based applications of multi-mission Satellite Radar Altimetry
The success of the Radar Altimeter in determining sea surface heights over the open ocean is well known, with heights accurate to <5cm (Chelton et al., 2001); however land based applications are under developed. This is due to the complexity of the waveforms returned from land surfaces; retracking …
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GLOBAL TRENDS IN EDDY KINETIC ENERGY FROM SATELLITE ALTIMETRY
The temporal changes in the oceanic eddy kinetic energy (EKE) including trends and variability are presented and the dynamical mechanisms are investigated. The domain is near-global with a focus on the North Atlantic, North Pacific and Southern Oceans. Altimeter-derived geostrophic surface …
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On the role of high frequency waves in ocean altimetry
<p>This work mines a coastal and open ocean air-sea interaction field experiment data set where the goals are to refine satellite retrieval of wind, wind stress, and sea level using a microwave radar altimeter. The data were collected from a low-flying aircraft using a sensor suite designed to …
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The identification and tracking of Agulhas rings using satellite altimetry
The methods of analysing, interpreting and computing surf ace geostrophic currents from GEOSAT altimeter data are explained. These methods were implemented in an examination of GEOSAT altimeter data for the period 12 July 1988 to 13 May 1989 with application to the identification and tracking of …
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Using Airborne Laser Altimetry to Characterize Surface Fuels in Western Montana
Quantifying surface fuels in forests is problematic for land managers due to the difficulty in measuring fuels of different sizes and spatial variability. Estimating fuel loads is important for identifying departures from historical fire regimes, predicting fire behavior and effects, and …
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Using Airborne Laser Altimetry to Characterize Surface Fuels in Western Montana
Quantifying surface fuels in forests is problematic for land managers due to the difficulty in measuring fuels of different sizes and spatial variability. Estimating fuel loads is important for identifying departures from historical fire regimes, predicting fire behavior and effects, and …
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Studies to Improve Estimation of the Electromagnetic Bias in Radar Altimetry
<p>In May of 2000 Jason-1, a joint project between NASA and the French space agency CNES, will be launched. Its mission is to continue the highly successful gathering of data which TOPEX/Poseidon has collected since August of 1992. The main goal of Jason-1 is to achieve higher accuracy in measuring …
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Precise orbit determination and analysis from satellite altimetry and laser ranging
… the tracking data - satellite laser ranging, altimetry and crossover height differences - and how this data can be used to analyse errors in the orbit, the geoid and sea-surface topography. The outcome of this analysis is the determination of a low degree and order model for sea surface …
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Coastal surface circulation of the Gulf of Cadiz from satellite altimetry measurements
… of coastal zone dynamics using high-resolution altimetry data. The study evaluates the possibility of studying mesoscale surface circulation in coastal areas, particularly in the Gulf of Cadiz, Spain, using high-resolution altimetry data with a posting rate of 20 Hz from CryoSat-2 (CS2). For …
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Satellite borne radar altimetry : empirical orbit refinement and ocean signal recovery techniques
… sea surface obtained by satellite borne radar altimetry are irregularly spaced and contaminated with various modelling and correction errors. The largest source of uncertainty for low Earth orbiting satellites such as ERS-1 and Geosat may be attributed to orbital modelling errors. The empirical …
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Characterization of crater morphometry on the Moon and Mercury from altimetry observations
Recently acquired altimetry data from laser altimeters are used to assess the morphometry of impact craters. Data acquired by the Mercury Laser Altimeter on the MESSENGER spacecraft are used to measure the depths and diameters of 537 craters at the high northern latitudes on Mercury, including 42 …
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GPS kinematic positioning for the airborne laser altimetry at Long Valley, California
… in the 1993 and 1995 Long Valley airborne laser altimetry surveys. We performed four types of tests: (a) Static tests which the evaluate the root-mean-square (RMS) scatter of the aircraft position while it is stationary on the run-way; (b) runway tests which compare the height estimates of the …
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Feasibility of using cloud top altimetry for estimating tropical cyclone intensity estimation
This project explores whether cloud top altimetry can be used as an accurate and reliable means of estimating the intensity of tropical cyclones. Professor Kerry A. Emanuel developed the theory that is under investigation. His theory aims to calculate the peak surface wind speed in hurricanes using …
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Land Ice Monitoring via GRACE and Satellite Altimetry in the Canadian Arctic Archipelago
… estimates from GRACE gravity and ICESat laser altimetry data for both the Northern and the Southern Canadian Arctic (NCA; SCA), compare both estimates and assess them with respect to previous studies, while discussing the reasons of the potential discrepancies existing. GRACE data are available …
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An altimetry based examination of the path and variability of the Agulhas Return Current
As a result of climate change, partially driven by anthropogenic activity, strengthening wind stress over the worlds oceans is yielding a western boundary intensification and pole-ward shift of oceanic currents (Yang, 2016). Shifting wind regimes and perturbations in neighboring currents have been …
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