Tesi sul tema "Laboratory for Applications of Remote Sensing"
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Philipson, née Ammenberg Petra. "Environmental Applications of Aquatic Remote Sensing". Doctoral thesis, Uppsala University, Centre for Image Analysis, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3328.
Testo completoMany lakes, coastal zones and oceans are directly or indirectly influenced by human activities. Through the outlet of a vast amount of substances in the air and water, we are changing the natural conditions on local and global levels.
Remote sensing sensors, on satellites or airplanes, can collect image data, providing the user with information about the depicted area, object or phenomenon. Three different applications are discussed in this thesis. In the first part, we have used a bio-optical model to derive information about water quality parameters from remote sensing data collected over Swedish lakes. In the second part, remote sensing data have been used to locate and map wastewater plumes from pulp and paper industries along the east coast of Sweden. Finally, in the third part, we have investigated to what extent satellite data can be used to monitor coral reefs and detect coral bleaching.
Regardless of application, it is important to understand the limitations of this technique. The available sensors are different and limited in terms of their spatial, spectral, radiometric and temporal resolution. We are also limited with respect to the objects we are monitoring, as the concentration of some substances is too low or the objects are too small, to be identified from space. However, this technique gives us a possibility to monitor our environment, in this case the aquatic environment, with a superior spatial coverage. Other advantages with remote sensing are the possibility of getting updated information and that the data is collected and distributed in digital form and therefore can be processed using computers.
Philipson, Petra. "Environmental applications of aquatic remote sensing /". Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2003. http://publications.uu.se/theses/91-554-5542-5/.
Testo completoSaraf, Arun Kumar. "Remote sensing applications in geobotanical exploration : some applications of remote sensing to geological surveying in vegetated areas". Thesis, University of Dundee, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276975.
Testo completoEgido, Egido Alejandro. "GNSS reflectometry for land remote sensing applications". Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/129090.
Testo completoLa humedad del suelo y la biomasa de la vegetaci on son dos parametros clave desde un punto de vista tanto cient co como econ omico. Por una parte son esenciales para el estudio del ciclo del agua y del carbono. Por otra parte, la humedad del suelo es esencial para la gesti on de las cosechas y los recursos h dricos, mientras que la biomasa es un par ametro fundamental para ciertos programas de desarrollo. Varias formas de teledetección se han utilizado para la observaci on remota de estos par ametros, sin embargo, su monitorizaci on con la precisi on y resoluci on necesarias es todav a un importante reto tecnol ogico. Esta Tesis evalua la capacidad de medir humedad del suelo y biomasa de la vegetaci on con señales de Sistemas Satelitales de Posicionamiento Global (GNSS, en sus siglas en ingl es) reflejadas sobre la Tierra. La t ecnica se conoce como Reflectometr í a GNSS (GNSS-R), la cual ha ganado un creciente inter es dentro de la comunidad científ ca durante las dos ultimas d ecadas. Experimentos previos a este trabajo ya demostraron la capacidad de observar cambios en la reflectividad del terreno con GNSS-R. El uso de la componente copolar y contrapolar de la señal reflejada fue propuesto para independizar la medida de humedad del suelo de otros par ametros como la rugosidad del terreno. Sin embargo, no se pudo demostrar una evidencia experimental de la viabilidad de la t ecnica. En este trabajo se analiza desde un punto de vista te orico y experimental el uso de la informaci on polarim etrica de la señales GNSS reflejadas sobre el suelo para la determinaci on de humedad y biomasa de la vegetaci on. La Tesis se estructura en cuatro partes principales. En la primera parte se eval uan los aspectos fundamentales de la t ecnica y se da una revisi on detallada del estado del arte para la observaci on de humedad y vegetaci on. En la segunda parte se discuten los modelos de dispersi on electromagn etica sobre el suelo. Simulaciones con estos modelos fueron realizadas para analizar las componentes coherente e incoherente de la dispersi on de la señal reflejada sobre distintos tipos de terreno. Durante este trabajo se desarroll o un modelo de reflexi on simpli cado para poder relacionar de forma directa las observaciones con los par ametros geof sicos del suelo. La tercera parte describe las campañas experimentales realizadas durante este trabajo y discute el an alisis y la comparaci on de los datos GNSS-R con las mediciones in-situ. Como se predice por los modelos, se comprob o experimentalmente que la señal reflejada est a formada por una componente coherente y otra incoherente. Una t ecnica de an alisis de datos se propuso para la separacióon de estas dos contribuciones. Con los datos de las campañas experimentales se demonstr o el bene cio del uso de la informaci on polarim etrica en las señales GNSS reflejadas para la medici on de humedad del suelo, para la mayor a de las condiciones de rugosidad observadas. Tambi en se demostr o la capacidad de este tipo de observaciones para medir zonas boscosas densamente pobladas. La cuarta parte de la tesis analiza la capacidad de la t ecnica para observar cambios en la reflectividad del suelo desde un sat elite en orbita baja. Los resultados obtenidos muestran que la reflectividad del terreno podr a medirse con gran precisi on ya que la componente coherente del scattering ser a la predominante en ese tipo de escenarios. En este trabajo de doctorado se muestran la potencialidades de la t ecnica GNSS-R para observar remotamente par ametros del suelo tan importantes como la humedad del suelo y la biomasa de la vegetaci on. Este tipo de medidas pueden complementar un amplio rango de misiones de observaci on de la Tierra como SMOS, SMAP, y Biomass, esta ultima recientemente aprobada para la siguiente misi on Earth Explorer de la ESA.
Hong, Guowei. "Satellite image processing for remote sensing applications". Thesis, University of Central Lancashire, 1995. http://clok.uclan.ac.uk/1878/.
Testo completoBoudreau, Sylvain. "Applications of frequency combs in remote sensing". Doctoral thesis, Université Laval, 2014. http://hdl.handle.net/20.500.11794/25325.
Testo completoThe goal of this thesis is to explore the potential applications of frequency combs for remote sensing. For this purpose, three comb-based configurations are studied. For each of these configurations, an analysis of their workings is performed and their advantages and disadvantages are discussed. Experimental setups based on those configurations were built in laboratory. The detection capabilities of the techniques are demonstrated through experimental measurements. The first configuration that is studied enables passive sampling of an external optical source. Using this technique, it is possible to compute the spectrum of the considered source by interferometrically combining it with the pulses from a pair of frequency combs. A stochastic study of the technique is performed to assess its performance limits. Coherent and incoherent sources with high-resolution spectral content are measured. The second technique uses a configuration called incoherent that enables active characterization of a target. Using this technique, it is possible to perform range-resolved hyperspectral measurements of an observed scene. A hyperspectral lidar setup was designed and assembled in laboratory with the goal of performing outdoors measurements of targets at distances up to 175 m. The sensing capabilities of the system are shown for hard and distributed targets, in the form of aerosol clouds. Molecular absorption measurements, as well as thickness measurements for both transparent and translucent targets, are shown. Using the coherent configuration, which is the third one that was considered, it is possible to make active measurements of a target by using one of the pulse trains as a local oscillator. The use of a local oscillator opens the door to high sensitivity vibrometry, which is impossible with the incoherent configuration. An analytical model for the power collection capabilities of a single-transverse-mode system, which has to be used for coherent measurements, is developed and experimentally validated. The usual referencing technique, which is used to correct for fluctuations in comb parameters, is modified and adapted to the case of coherent vibrometry. Range-resolved vibrometry measurements are performed, demonstrating the capability of the system to extract a human voice signal from the vibrations of a wall.
Teterukovskiy, Alexei. "Computational statistics with environmental and remote sensing applications /". Umeå : Dept. of Forest Economics, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/s277.pdf.
Testo completoChon, Suet-ling, e 莊雪玲. "Remote sensing applications in studying marine biological processes". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31255826.
Testo completoMiller, S. T. "Remote sensing applications to flood hydrology in Belize". Thesis, Aston University, 1986. http://publications.aston.ac.uk/14242/.
Testo completoBahadori, Keyvan. "Spaceborne reflector antennas for advanced remote sensing applications". Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1562125061&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Testo completoOppenheimer, Clive. "Volcanology from space : applications of infrared remote sensing". Thesis, Open University, 1991. http://oro.open.ac.uk/57337/.
Testo completoTadros, Antoine. "Statistical background modeling and applications in remote sensing". Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPASM031.
Testo completoThis thesis addresses some problems in remote sensing and statistical background modeling using the a-contrario theory and artificial neural network models. The work is motivated by two applications in remote sensing where the control of false alarms is an issue due to the large-scale nature of the problems.The identification and measuring of oil depots using satellite images has important commercial and strategic value. Here is addressed the former: the detection of oil storage sites while analyzing vast quantities of satellite images covering a whole country or continent. In this context, to be useful an algorithm needs to achieve a high recall while controlling the number of false detections and with a reduced computational cost. The first method proposed here starts by detecting circular objects, which are then clustered using the a-contrario framework; indeed, oil depots often correspond to a dense group of cylindrical buildings. The approach is completed by an a-contrario patch-matching procedure to recover the missing tanks. Since the method relies heavily on the detection of circular objects, several algorithms for detecting circles in low-resolution satellite images are compared. The a-contrario algorithm is also compared to two neural-network architectures for oil depot segmentation.The second remote sensing application is the detection of hot spots in the daytime using multi-band satellite images that do not have thermal bands. This allows the monitoring of the activity of oil refineries, cement works, and steel mills as well as the activities of volcanoes.The first proposed method is based on an anomaly detection algorithm.A second approach relies on measuring the fitness of the measured radiances in the selected spectral bands to the black body model.Finally, this thesis deals with out-of-distribution (OOD) detection in deep learning methods. A first approach is to supplement the training dataset with extraneous data assigned to an additional out-of-distribution class. Training the model on a segregated dataset helps the model to discriminate out-of-distribution samples, including those the model was never exposed to during training. An unsupervised approach to OOD detection is also presented. For that, a new neural network layer is proposed that enforces a Gaussian embedding for each class. Using this new layer, each target class can be represented by a Gaussian distribution. New samples are then evaluated as belonging to a target class or not by performing a chi-square test for each one. Samples rejected by all tests are considered OOD. This methodology also allows to identify ambiguous samples when validated by more than one class
Ali, Khalid A. "PREDICTION OF WATER QUALITY PARAMETERS FROM VIS-NIR RADIOMETRY: USING LAKE ERIE AS A NATURAL LABORATORY FOR ANALYSIS OF CASE 2 WATERS". Kent State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=kent1309980508.
Testo completoBrewer, Charles Kenneth. "Remote Sensing Applications to Support Sustainable Natural Resource Management". The University of Montana, 2007. http://etd.lib.umt.edu/theses/available/etd-12282007-164513/.
Testo completoTooke, Thoreau Rory. "Remote sensing applications for vegetation management in urban environments". Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/11502.
Testo completoBuehler, Stefan. "Remote sensing of atmospheric composition for climate applications : Habilitationschrift". Doctoral thesis, Bremen : University of Bremen, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18528.
Testo completoRambat, Shuib. "A low-cost remote sensing system for agricultural applications". Thesis, Aston University, 2012. http://publications.aston.ac.uk/16472/.
Testo completoJohnson, Jennifer Erin. "Remote sensing applications of uncooled long-wave infrared thermal imagers". Thesis, Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/johnson/JohnsonJ0812.pdf.
Testo completoReed, Jamie. "Development of long life minature cooler for remote sensing applications". Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409765.
Testo completoMurnion, Shane D. "Neural and genetic algorithm applications in GIS and remote sensing". Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337024.
Testo completoWeeks, Scarla Jeanne. "Specific applications of satelite remote sensing to the Benguela ecosystem". Doctoral thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/11574.
Testo completoThe objective of this thesis was to utilise high resolution satellite data, from the NOAA AVHRR and OrbView-2 SeaWiFS sensors, to investigate the upper layer dynamics of the Benguela ecosystem in more detailed space and time scales than previously undertaken. The standard for SeaWiFS bio-optical algorithms and processing parameters are not ideal for the highly productive Benguela waters. Hence, a detailed investigation was undertaken, and the processing parameters modified for more optical application to Benguela waters. Examination of the individual radiances used in the bio-optical algorithm revealed that constituents, other than chlorophyll, were at times contributing significantly to the in-water light field. The approach adopted in this thesis was that the application of satellite data to Benguela waters should be considered either as qualitative, for event scale phenomena, or quantitative, for the longterm study.
Cassidy, Scott L. "Millimetre-wave FMCW radar for remote sensing and security applications". Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7856.
Testo completoSihra, Kamaljit S. "Laboratory measurements of near-infrared methane bands for remote sensing of the Jovian atmosphere". Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299388.
Testo completoMatthews, Amy L. "Applications of infrared fibers in temperature sensing". Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/45909.
Testo completoAs attenuation in silica based fibers approaches its ultimate theoretical limit, investigation is in progress to develop new materials which exhibit lower losses than silica. These bulk materials could then be used to fabricate ultralow loss optical fibers which operate farther out in the infrared than do silica fibers. Such infrared fibers could be used in long, repeaterless telecommunications links, the transmission of CO and CO2 laser power, and in several sensing mechanisms. This thesis presents an overview of these new fibers and how they can be applied in noncontact temperature measurement. Fiber optic temperature sensing is thus reviewed, and an optical fiber pyrometer is discussed.
Master of Science
Stefanou, Marcus S. "Spectral image utility for target detection applications /". Online version of thesis, 2008. http://hdl.handle.net/1850/7043.
Testo completoMcLean, Andrew Lister. "Applications of maximum entropy data analysis". Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319161.
Testo completoSolomon, Semere. "Remote Sensing and GIS : Applications for Groundwater Potential Assessment in Eritrea". Doctoral thesis, KTH, Civil and Architectural Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3491.
Testo completoAn integrated approach with remote sensing, GeographicInformation Systems (GIS) and more traditional fieldworktechniques was adopted to assess the groundwater potential inthe central highlands of Eritrea. Digitally enhanced colorcomposites and panchromatic images of Landsat TM and Spot wereinterpreted to produce thematic maps such as lithology andlineaments. The potential of the Advanced Spaceborne ThermalEmission and Reflection Radiometer (ASTER) data forlithological and lineament mapping was evaluated. Topographicparameters such as surface curvature, slope and drainagesystems were derived from digital elevation models and used tomap landforms. Digital elevation models (DEM) derived fromcontours and acquired in the Shuttle Radar Topographic Mission(SRTM) were compared in relation to location, drainage networksand lineament extraction. Fracture patterns and spacing weremeasured in the field in different rock types and compared withlineaments. Selected springs and wells were visited to studytheir topographic and hydrogeological setting. Well logs,pumping tests, water table depth in dry and wet season as wellas location of wells were collected. All thematic layersincluding hydrogeological data were integrated and analysed ina geographic information system. A groundwater potential mapwas generated and compared with yield data. Groundwaterrecharge was estimated based on water level fluctuations inlarge dug wells and chloride mass-balance method.
Principal component analysis for rock type mapping providedbetter results with ASTER than with Landsat TM data. DEM datapermitted to create detailed landform maps useful torgroundwater potential assessment. DEM derived from SRTM dataare better for detection of drainage systems and linearfeatures than those derived from contours. Most of the fracturesystems corresponding to lineaments are either extensionalrelated to normal faults and dykes, or shear fractures relatedto strike-slip faults. N-S, NW-SE, WNW-ESE, NE-SW and ENE-WSWare dominant fracture orientations with often very densespacing. High yielding wells and springs are often related tolarge lineaments and corresponding structural features such asdykes. Typically wells and springs in basaltic areas havehigher yields mainly due to primary joints. Young alluvialsediments with high permeability and deeply weathered rocklayers are important for water supply especially in hydraulicconnection with fracture systems in crystalline bedrock.Groundwater potential zones demarcated through the model are inagreement with bore well yield data. The spatial distributionof groundwater potential zones shows regional patterns relatedto lithologies, lineaments, drainage systems and landforms.Recharge rates of 10 - 50 mm were estimated in this region. Theresults demonstrate that the integration of remote sensing,GIS, traditional fieldwork and models provide a powerful toolin the assessment and management of water resources anddevelopment of groundwater exploration plans.
Key words:Remote sensing, Geographic InformationSystems, groundwater, geomorphology, Digital elevation model,lithology, hard rock, lineament, structures, hydrogeology,Eritrea
Ross, Timothy J. "Remote sensing applications in an alfalfa capability assessment of saline soils". Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28330.
Testo completoLand and Food Systems, Faculty of
Graduate
Ao, Chi On 1970. "Electromagnetic wave scattering by discrete random media with remote sensing applications". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/16782.
Testo completoIncludes bibliographical references (p. 171-182).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
The scattering of electromagnetic waves in medium with randomly distributed discrete scatterers is studied. Analytical and numerical solutions to several problems with implications for the active and passive remote sensing of the Earth environment are obtained. The quasi-magnetostatic (QMS) solution for a conducting and permeable spheroid under arbitrary excitation is presented. The spheroid is surrounded by a weakly conducting background medium. The magnetic field inside the spheroid satisfies the vector wave equation, while the magnetic field outside can be expressed as the gradient of the Laplace solution. We solve this problem exactly using the separation of variables method in spheroidal coordinates by expanding the internal field in terms of vector spheroidal wavefunctions. The exact formulation works well for low to moderate frequencies; however, the solution breaks down at high frequency due to numerical difficulty in computing the spheroidal wavefunctions. To circumvent this difficulty, an approximate theory known as the small penetration-depth approximation (SPA) is developed. The SPA relates the internal field in terms of the external field by making use of the fact that at high frequency, the external field can only penetrate slightly into a thin skin layer below the surface of the spheroid. For spheroids with general permeability, the SPA works well at high frequency and complements the exact formulation. However, for high permeability, the SPA is found to give accurate broadband results. By neglecting mutual interactions, the QMS frequency response from a collection of conducting and permeable spheroids is also studied.
(cont.) In a dense medium, the failure to properly take into account of multiple scattering effects could lead to significant errors. This has been demonstrated in the past from extensive theoretical, numerical, and experimental studies of electromagnetic wave scattering by densely packed dielectric spheres. Here, electromagnetic wave scattering by dense packed dielectric spheroids is studied both numerically through Monte Carlo simulations and analytically through the quasi-crystalline approximation (QCA) and QCA with coherent potential (QCA-CP). We assume that the spheroids are electrically small so that single-particle scattering is simple. In the numerical simulations, the Metropolis shuffling method is used to generate realizations of configurations for non-interpenetrable spheroids. The multiple scattering problem is formulated with the volume integral equation and solved using the method of moments with electrostatic basis functions. General expressions for the self-interaction elements are obtained using the low-frequency expansion of the dyadic Green's function, and radiative correction terms are included. Results of scattering coefficient, absorption coefficient, and scattering matrix for spheroids in random and aligned orientation configurations are presented. It is shown that independent scattering approximation can give grossly incorrect results when the fractional volume of the spheroids is appreciable.
(cont.) In the analytical approach, only spheroids in the aligned configuration are solved. Low-frequency QCA and QCA-CP solutions are obtained for the average Green's function and the effective permittivity tensor. For QCA-CP, the low-frequency expansion of the uniaxial dyadic Green's function is required. The real parts of the effective permittivities from QCA and QCA-CP are compared with the Maxwell-Garnett mixing formula. ...
by Chi On Ao.
Ph.D.
Reichle, Rolf H. (Rolf Helmut) 1968. "Variational assimilation of remote sensing data for land surface hydrologic applications". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/28220.
Testo completoIncludes bibliographical references (p. 283-192).
Soil moisture plays a major role in the global hydrologic cycle. Most importantly, soil moisture controls the partitioning of available energy at the land surface into latent and sensible heat fluxes. We investigate the feasibility of estimating large-scale soil moisture profiles and related land surface variables from low-frequency (L-band) passive microwave remote sensing observations using weak-constraint variational data assimilation. We extend the iterated indirect representer method, which is based on the adjoint of the hydrologic model, to suit our application. The four-dimensional (space and time) data assimilation algorithm takes into account model and measurement uncertainties and provides optimal estimates by implicitly propagating the full error covariances. Explicit expressions for the posterior error covariances are also derived. We achieve a dynamically consistent interpolation and extrapolation of the remote sensing data in space and time, or equivalently, a continuous update of the model predictions from the data. Our hydrologic model of water and energy exchange at the land surface is expressly designed for data assimilation. It captures the key physical processes while remaining computationally efficient. The assimilation algorithm is tested with a series of experiments using synthetically generated system and measurement noise. In a realistic environment based on the Southern Great Plains 1997 (SGP97) hydrology experiment, we assess the performance of the algorithm under ideal and non ideal assimilation conditions. Specifically, we address five topics which are crucial to the design of an operational soil moisture assimilation system. (1) We show that soil moisture can be satisfactorily estimated at scales finer than the resolution of the brightness images (downscaling), provided sufficiently accurate fine-scale model inputs are available. (2) The satellite repeat cycle should be shorter than the average interstorm period. (3) The loss of optimality by using shorter assimilation intervals is offset by a substantial gain in computational efficiency. (4) Soil moisture can be satisfactorily estimated even if quantitative precipitation data are not available. (5) The assimilation algorithm is only weakly sensitive to inaccurate specification of the soil hydraulic properties. In summary, we demonstrate the feasibility of large-scale land surface data assimilation from passive microwave observations.
by Rolf H. Reichle.
Ph.D.
Chesney, James R., e Roger Bakos. "AFFORDABLE GROUND STATION EQUIPMENT FOR COMMERCIAL AND SCIENTIFIC REMOTE SENSING APPLICATIONS". International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/608539.
Testo completoThe remote sensing industry is experiencing an unprecedented rush of activity to deploy commercial and scientific satellites. NASA and its international partners are leading the scientific charge with The Earth Observation System (EOS) and the International Space Station Alpha (ISSA). Additionally, there are at least ten countries promoting scientific/commercial remote sensing satellite programs. Within the United States, commercial initiatives are being under taken by a number of companies including Computer Technology Associates, Inc., EarthWatch, Inc., Space Imaging, Inc., Orbital Imaging Corporation and TRW, Inc. This activity is due to factors including: technological advances which have lead to significant reductions in the costs to build and deploy satellites; an awareness of the importance of understanding human impact on the ecosystem; and a desire to collect and sell data some believe will be worth $1.5 billion (USD) per year within five years. The success and usefulness of these initiatives, both scientific and commercial, depends largely on the ease and cost of providing remotely sensed data to value added resellers and end-users. A number of these spacecraft will provide an interface directly to users. To provide these data to the largest possible user base, ground station equipment must be affordable and the data must be distributed in a timely manner (meaning seconds or minutes, not days) over commercial network and communications equipment. TSI TelSys, Inc. is developing ground station equipment that will perform both traditional telemetry processing and the bridging and routing functions required to seamlessly interface commercial local- and wide-area networks and satellite communication networks. These products are based on Very Large Scale Integration (VLSI) components and pipelined, multi-processing architectures. This paper describes TelSys’ product family and its envisioned use within a ground station.
Westin, Benjamin Alexander. "Applications in Remote Sensing Using the Method of Ordered Multiple Interactions". Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/19346.
Testo completoequations describing surface scattering which is both computationally efficient and reliably
convergent. The method has been applied in a variety of ways to solving the electromagnetic
scattering from perfectly-conducting rough surfaces. A desire to more accurately predict
the scattering from natural terrain has led to the representation of the surface material as
penetrable instead of conductive.
For this purpose, the Method of Ordered Multiple Interactions is applied to numerically
solve the electromagnetic scattering from randomly-rough dielectric surfaces. A primary
consequence of the penetrable surface material is the introduction of a pair of coupled integral equations in place of the single integral equation used to solve the problem with a perfectly conducting surface. The method is tested and analyzed by developing independent scattering solutions for canonical cases in a transform domain and by comparing results with solutions from other techniques.
The dielectric implementation of the Method of Ordered Multiple Interactions is used to solve
the electromagnetic scattering from a class of randomly-rough dielectric surfaces. This allows
for the characterization of the effect of a number of transmitter and surface parameters in the
scattering problem, observing bistatically and also specifically in the backscatter direction.
MOMI is then applied as a method to examine subsurface penetration characteristics from
a similar family of rough surfaces. Characteristics of the environment parameters and the
scattered field itself are examined, and the numerical challenges associated with observing
beneath the surface are identified and addressed.
The Method of Ordered Multiple Interactions is then incorporated as a major component of
a larger solution which computes the total scattering when a dielectric object is buried just
beneath the rough surface. This hyrid approach uses MOMI and the Method of Moments to
iteratively account for multiple interactions between the target and the dielectric interface,
enabling the study of scattering from the combined environment of a rough surface and the
embedded object, as well as the individual scattering events which combine to form the
steady-state solution.
Ph. D.
Peng, Yuxiang. "GNSS-based Spacecraft Formation Flying Simulation and Ionospheric Remote Sensing Applications". Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/79594.
Testo completoMaster of Science
Brooks, Evan B. "Fourier Series Applications in Multitemporal Remote Sensing Analysis using Landsat Data". Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23276.
Testo completoPh. D.
Ashcraft, Ivan S. "Microwave Remote Sensing of the Greenland Ice Sheet: Models and Applications". Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd532.pdf.
Testo completoYoshioka, Hiroki 1967. "Applications of transport theory in optical remote sensing of land surfaces". Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284824.
Testo completoStrutt, Michael A. "Rediscovering the Dead: Practical Applications of Remote Sensing in Historic Cemeteries". W&M ScholarWorks, 1991. https://scholarworks.wm.edu/etd/1539625656.
Testo completoGudex-Cross, David James. "Remote Sensing Methods and Applications for Detecting Change in Forest Ecosystems". ScholarWorks @ UVM, 2018. https://scholarworks.uvm.edu/graddis/966.
Testo completoDarling, Paul Simon. "SAR modelling for ecological applications". Thesis, University of Reading, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297315.
Testo completoMtshemla, Kanyisa Sipho. "Mission design of a CubeSat constellation for in-situ monitoring applications". Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2633.
Testo completoReal-time remote monitoring of Africa’s resources, such as water quality, by using terrestrial sensors is impeded by the limited connectivity over the vast rural areas of the continent. Without such monitoring, the effective management of natural resources, and the response to associated disasters such as flooding, is almost impossible. A constellation of nanosatellites could provide near real-time connectivity with ground-based sensors that are distributed across the continent. This study evaluates the high level development of a mission design for a near real-time remote monitoring CubeSat constellation and ground segment for in-situ monitoring in regions of interest on the African continent. This would facilitate management of scarce resources using a low-cost constellation. To achieve this, the design concept and operation of a Walker constellation are examined as a means of providing connectivity to a low bit rate sensor network distributed across geographic areas of interest in South Africa, Algeria, Kenya and Nigeria. The mission requirements include the optimisation of the constellation to maintain short revisit times over South Africa and an investigation of the required communications link to perform the operations effectively. STK software is used in the design and evaluation of the constellations and the communications system. The temporal performance parameters investigated are access and revisit times of the constellations to the geographic areas mentioned. The types of constellation configurations examined, involved starting with a system level analysis of one satellite. This seed satellite has known orbital parameters. Then a gradual expansion of two to twelve satellites in one, two and three orbital planes follows. VHF, UHF and S-band communication links are considered for low data rate in-situ monitoring applications. RF link budgets and data budgets for typical applications are determined. For South Africa, in particular, a total of 12 satellites evenly distributed in a two-plane constellation at an inclination of 39° provide the optimal solution and offer an average daily revisit time of about 5 minutes. This constellation provides average daily access time of more than 16 hours per day. A case study is undertaken that decribes a constellation for the provision of maritime vessel tracking in the Southern African oceans using the Automated Information System (AIS). This service supports the Maritime Domain Awareness (MDA) initiative implemented by the South African Government, under its Operation Phakisa.
National Research Foundation (NRF) French South African Institute of Technology (F’SATI)
Ouellette, Karli J. "Hydrologic applications of GPS site-position observations in the Western U.S". Thesis, University of California, Irvine, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3605189.
Testo completoPermanent Global Positioning System (GPS) networks have been established around the globe for a variety of uses, most notably to monitor the activity of fault lines and tectonic plate motion. A model for utilizing GPS as a tool for hydrologic monitoring is also developed.
First, observations of the recent movement of the land surface throughout California by the Scripps Orbit and Permanent Array Center (SOPAC) GPS network are explored. Significant seasonal cycles and long term trends are related to historical observations of land subsidence. The pattern of deformation throughout the state appears to be caused by the occurrence of poroelastic deformation of the aquifer in the Central Valley, and elastic crustal loading by surface water and the winter snowpack in the Sierra Nevada Mountains. The result is a sort of teeter-totter motion between the Valley and the mountains where the Valley sinks in the dry season while the mountains lift, and the mountains sink in the wet season while the Valley lifts.
Next, the elastic crustal deformation caused by the winter snowpack is explored more thoroughly at 6 high elevations throughout the Western United States. Expected annual deformation as a result of thermoelastic and snow water equivalent are calculated using SNOTEL observations and an elastic half-space model. The results demonstrate the dominance of snow loading on the seasonal vertical land surface deformation at all 6 GPS stations. The model is then reversed and applied to the GPS vertical site-position observations in order to predict snow water equivalent. The results are compared to SNOTEL observations of snow water equivalent and soil moisture. The study concludes that GPS site-position observations are able to predict variations in snow water equivalent and soil moisture with good accuracy.
Then a model which incorporates both elastic crustal loading and poroelastic deformation was used to predict groundwater storage variations at 54 GPS stations throughout the Central Valley, CA. The results are compared to USGS water table observations from 43 wells. The predictions and observations show a similar magnitude and spatial pattern of groundwater depletion on both a seasonal and long term timescales. Depletion is focused on the southernmost part of the Valley where GPS reveals seasonal fluctuation of the water table around 2 m and 8 m/yr of water table decline during the study period. GPS also appears to respond to deformation from peat soils and changing reservoir storage in the northern parts of the Valley.
Finally, preliminary work exploring the potential for using GPS as a tool for monitoring snowmelt runoff and infiltration is explored at one station in Eastern Idaho. Taking the difference between the change in GPS water storage estimates with time and the change in SNOTEL observed snow water equivalent with time produces a time series of infiltration, or the amount of water added to storage in the geologic profile. Then subtracting the estimated infiltration and snow water equivalent from the total precipitation observed by SNOTEL produces a time series of runoff. The estimated runoff at the GPS site was compared to observations from a nearby stream gauge and the foundation for a more extensive comparison is laid out.
The overall impact of this work is to introduce the unique hydrologic information and monitoring capabilities which can be accessed through monitoring of the land surface position using GPS. As GPS networks grow and expand worldwide, the available data should be harnessed by the hydrologic community for the benefit of local water management as well as improvements to data assimilated models. The work presented here represents only a small fraction of the wealth of knowledge that could result from a budding field of GPS hydrologic remote sensing. (Abstract shortened by UMI.)
Buyuksalih, Gurcan. "Geometric and radiometric calibration of video infrared imagers for photogrammetric applications". Thesis, University of Glasgow, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284703.
Testo completoVoytenko, Denis. "Glaciological Applications of Terrestrial Radar Interferometry". Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5856.
Testo completoMagee, Kevin S. "Segmentation, Object-Oriented Applications for Remote Sensing Land Cover and Land Use Classification". University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1298040118.
Testo completoO'Bree, Terry Adam, e s9907681@student rmit edu au. "Investigations of light scattering by Australian natural waters for remote sensing applications". RMIT University. Applied Sciences, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080110.140055.
Testo completoMarzahn, Philip. "Multi-dimensional characterization of soil surface roughness for microwave remote sensing applications". Diss., lmu, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-154318.
Testo completoDonado, Morcillo Carlos Alberto. "Development of lightweight and low-cost microwave components for remote-sensing applications". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47532.
Testo completoHassan, Bukar. "Applications of remote sensing to arid grasslands : experimental and Nigerian case studies". Thesis, Bangor University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329703.
Testo completoDonado, Morcillo Carlos Alberto. "Development of lightweight and low-cost microwave components for remote-sensing applications". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/51733.
Testo completoEl, Vilaly Mohamed Abd salam Mohamdy. "Drought Monitoring with Remote Sensing Based Land Surface Phenology Applications and Validation". Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/301553.
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