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Remote Sensing

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Autonomous Robot Navigation In Unknown Terrains Using Parallel Numerical Artificial Potential Fields, John C. Schneider Dec 1994

Autonomous Robot Navigation In Unknown Terrains Using Parallel Numerical Artificial Potential Fields, John C. Schneider

Computer Science Theses & Dissertations

We present a new artificial potential field formulation for resolution complete robot navigation that unifies the purely geometric path planning problem with the lower level force control problem. Our formulation is designed for numerical computation over a massively parallel mesh of processors and is responsive to newly discovered terrain features. It does not suffer from many of the problems commonly associated with potential fields and with adequate resolution provides provably correct, collision free convergence to the goal. In addition, our formulation supports many desirable, practical features required for implementation, such as bounded actuator torques, attainable incremental constructability, realizable computation and …

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A Classification Of Ecosystem Desertification Using Satellite Imagery, Dzheltyrbas Gulf, 1980-1989, Marni D. Cavis Aug 1993

A Classification Of Ecosystem Desertification Using Satellite Imagery, Dzheltyrbas Gulf, 1980-1989, Marni D. Cavis

Masters Theses

This study focused on the development of a land cover classification method for the Dzhiltyrbas Gulf region southeast of the Aral Sea in the former Soviet Union. Desertification of the region was mapped based on ecosystem descriptions taken from a database defining four stages of desertification. Landsat MSS images (bands 1, 2, and 4) were used as the basis for classification. Standard unsupervised and supervised classification methods did not distinguish the level of detail required to map each stage of desertification in each ecosystem. Therefore, the ecosystems had to be defined and classified as separate entities (based on SBI and …

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Movements And Behavior Of Wild And Head-Started Sea Turtles, John A. Keinath Jan 1993

Movements And Behavior Of Wild And Head-Started Sea Turtles, John A. Keinath

Dissertations, Theses, and Masters Projects

Flipper-tagging, aerial surveys, and satellite telemetry was used to investigate the occurrence, migratory routes, distances traveled, swimming speeds, diving behavior, and the relation of water temperature to movements and timing of migration of wild loggerhead (Caretta caretta) and Kemp's ridley (Lepidochelys kempii) sea turtles. The behavior and movements of head-started loggerhead turtles was investigated with satellite telemetry and compared to wild turtles. Flipper-tagged loggerhead and Kemp's ridley turtles inhabit Chesapeake Bay during the warm months and many return in subsequent seasons. Aerial surveys showed that loggerhead turtles migrate from south of Cape Hatteras to northern waters during May and June, …

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The Global-To-Local Search Method: A Systematic Search Procedure That Uses The Context Of The Textured Layout To Locate And Detect Low-Contrast Targets In Aerial Images, Keith Marron Park Jan 1993

The Global-To-Local Search Method: A Systematic Search Procedure That Uses The Context Of The Textured Layout To Locate And Detect Low-Contrast Targets In Aerial Images, Keith Marron Park

Theses Digitization Project

No abstract provided.

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Rediscovering The Dead: Practical Applications Of Remote Sensing In Historic Cemeteries, Michael A. Strutt Jan 1991

Rediscovering The Dead: Practical Applications Of Remote Sensing In Historic Cemeteries, Michael A. Strutt

Dissertations, Theses, and Masters Projects

No abstract provided.

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Integrated Control Of Thermally Distorted Large Space Antennas, Robert H. Tolson Oct 1990

Integrated Control Of Thermally Distorted Large Space Antennas, Robert H. Tolson

Mechanical & Aerospace Engineering Theses & Dissertations

Studies on controlling the thermal distortion of large space antennae have generally investigated a single orbital position and have optimized actuator locations based on minimizing the RMS surface deviation from the original parabolic shape. One study showed the benefits of directly using far zone electric field characteristics as the performance measure; but, this approach resulted in a nonlinear programming problem. The objective of the current study is to develop an approach to designing a control system that (1) recognizes the time dependence of the distortion and (2) controls variables that are directly related to far field performance in a quadratic …

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Lower Chesapeake Bay Surface Turbidity Variations As Detected From Landsat Images, Michael S. Fedosh Jan 1984

Lower Chesapeake Bay Surface Turbidity Variations As Detected From Landsat Images, Michael S. Fedosh

Dissertations, Theses, and Masters Projects

Landsat images are analyzed to investigate the causes of turbidity variations in lower Chesapeake Bay surface water. Visual analysis and image enhancement are used in association with optical film density data obtained along selected Bay transects. The optical density data of all images, inversely related to surface turbidity, are used to produce residual turbidity profiles showing turbidity above and below average conditions. meteorological conditions have Images with similar tidal or their residual optical density data averaged to identify probable causes of above average turbidity levels. Freshwater discharge does not directly contribute suspended sediment to Chesapeake Bay, except from the Potomac …

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The Technical, Legal And Political Implications Of Remote Sensing Satellites, Matthew Mahoney Jan 1983

The Technical, Legal And Political Implications Of Remote Sensing Satellites, Matthew Mahoney

Theses and Dissertations (Comprehensive)

This thesis examines the phenomenon of reconnaissance satellites and their role in the present arms race. While volumes of material have been written on the arms race in general, or the weapons race in particular, very little has been written on the role of satellites in this conflict and almost nothing has been written on the role of reconnaissance satellites. There is a need for much greater debate on the role of reconnaissance satellites in outer space. Reconnaissance satellites have, in part, rewritten the meaning of the arms race and they have contributed significantly to arms reductions talks between the …

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Usage And Limitations Of Characteristic Vector Analysis Of Remote Sensing Multispectral Data For The Identification And Quantification Of Water Quality Parameters, Theodore A. Talay Apr 1981

Usage And Limitations Of Characteristic Vector Analysis Of Remote Sensing Multispectral Data For The Identification And Quantification Of Water Quality Parameters, Theodore A. Talay

Civil & Environmental Engineering Theses & Dissertations

Recent applications of the technique of characteristic vector analysis to remote-sensing water color data has met with varying degrees of success. It is apparent from these experiments that a more thorough understanding of the informational capability of characteristic vector analysis is needed.

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The Development Of A Stepped Frequency Microwave Radiometer And Its Application To Remote Sensing Of The Earth, Richard Forrest Harrington Apr 1980

The Development Of A Stepped Frequency Microwave Radiometer And Its Application To Remote Sensing Of The Earth, Richard Forrest Harrington

Electrical & Computer Engineering Theses & Dissertations

The design, development, application, and capabilities of a variable frequency microwave radiometer are described. This radiometer has demonstrated the versatility, accuracy, and stability required to provide contributions to the geophysical understanding of ocean and ice processes. The design technique utilized a closed-loop feedback method, whereby noise pulses were added to the received electromagnetic radiation to achieve a null balance in a Dicke switched radiometer. Stability was achieved through the use of a constant temperature enclosure around the low loss microwave front end. The Dicke reference temperature was maintained to an absolute accuracy of 0.1 K using a closed-loop proportional temperature …

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Application Of Satellite Data And Lars' Data Processing Techniques To Mapping Vegetation Of The Dismal Swamp, Jeffrey Allan Messmore Oct 1975

Application Of Satellite Data And Lars' Data Processing Techniques To Mapping Vegetation Of The Dismal Swamp, Jeffrey Allan Messmore

Biological Sciences Theses & Dissertations

This study concerned the feasibility of using digital satellite imagery and automatic data processing (ADP) techniques as a means of mapping swamp forest vegetation. Multispectral scanner data acquired by the Earth Resources Technology Satellite (ERTS-1; renamed LANDSAT-1) was analyzed using ADP techniques developed by Purdue University's Laboratory for Applications of Remote Sensing (LARS). The site for this investigation was the Dismal Swamp, a 210,000 acre swamp forest located south of Suffolk, Va. on the Virginia-North Carolina border. Two basic classification strategies were employed in determining the vegetation mapping capability of ERTS-1 data. The initial classification utilized unsupervised techniques which produced …

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