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Littérature scientifique sur le sujet « Optical radar Observations »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 31 janvier 2023

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Articles de revues sur le sujet "Optical radar Observations"

Ogawa, T. "Radar observations of ionospheric irregularities at Syowa Station, Antarctica: a brief overview." Annales Geophysicae 14, no. 12 (December 31, 1996): 1454–61. http://dx.doi.org/10.1007/s00585-996-1454-z.

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Abstract. We briefly overview the radar observations that have been made for 30 years at Syowa Station, Antarctica for studying small-scale electron-density irregularities in the southern high-latitude E- and F-region ionosphere. Some observational results (i.e., long-term variations of radio aurora, Doppler spectra with narrow spectral widths and low Doppler velocities, and simultaneous observations of radar and optical auroras) from VHF radars capable of detecting 1.3- to 3-m scale irregularities are presented. A new 50-MHz radar system equipped with phased-antenna arrays began operation in

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Huyan, Zongbo, Yu Jiang, Hengnian Li, Pengbin Ma, and Dapeng Zhang. "Bistatic Radar Observations Correlation of LEO Satellites Considering J2 Perturbation." Mathematics 10, no. 13 (June 23, 2022): 2197. http://dx.doi.org/10.3390/math10132197.

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Space debris near Earth severely interferes with the development of space, and cataloging space objects is increasingly important. Since optical telescopes and radars used to detect space debris only provide short-arc observations, mathematical algorithms are needed to solve problems in the correlation of observations. In this work, an efficient mathematical algorithm based on J2 analytic solutions is put forward. Initial orbit determination (IOD) serves as the starter and orbit determination (OD) with the weighted least-squares method (WLSM) is used to improve the accuracy of the estimated or

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Brosch, N., D. Polishook, R. Helled, S. Schijvarg, and M. Rosenkrantz. "Radar and optical leonids." Atmospheric Chemistry and Physics Discussions 4, no. 2 (March 9, 2004): 1425–47. http://dx.doi.org/10.5194/acpd-4-1425-2004.

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Abstract. We present joint optical-radar observations of meteors collected near the peak of the leonid activity in 2002. We show four examples of joint detections with a large, phased array L-band radar and with intensified video cameras. The general characteristic of the radar-detected optical meteors is that they show the radar detection below the termination of the optical meteor. Therefore, at least some radar events associated with meteor activity are neither head echoes nor trail echoes, but probably indicate the formation of "charged clouds" after the visual meteor is extinguished.

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Brosch, N., D. Polishook, R. Helled, S. Schijvarg, and M. Rosenkrantz. "Radar and optical leonids." Atmospheric Chemistry and Physics 4, no. 4 (July 6, 2004): 1063–69. http://dx.doi.org/10.5194/acp-4-1063-2004.

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Abstract. We present joint optical-radar observations of meteors collected near the peak of the Leonid activity in 2002. We show four examples of joint detections with a large, phased array L-band radar and with intensified video cameras. The general characteristic of the radar-detected optical meteors is that they show the radar detection below the termination of the optical meteor. Therefore, at least some radar events associated with meteor activity are neither head echoes nor trail echoes, but probably indicate the formation of "charged clouds" after the visual meteor is extinguished.

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Mann, Ingrid, Asta Pellinen-Wannberg, and Anders Tjulin. "Meteor studies applying incoherent scatter radar instruments." Proceedings of the International Astronomical Union 10, H16 (August 2012): 181. http://dx.doi.org/10.1017/s1743921314005353.

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AbstractOne of the interesting aspects of optical meteor studies is that the spectral composition of the brightness reveals information about the element composition of the solid particles that enter Earthfs atmosphere from interplanetary space. Deriving composition from optical spectra requires understanding the entry process during which the entering solid interacts with atmospheric species. This is especially so, because most meteors are observed at altitudes where the mean free path changes from tens of meters to millimeters, that is in the 120 km to 80 km altitude range within the atmosph

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Cline, Don, Simon Yueh, Bruce Chapman, Boba Stankov, Al Gasiewski, Dallas Masters, Kelly Elder, et al. "NASA Cold Land Processes Experiment (CLPX 2002/03): Airborne Remote Sensing." Journal of Hydrometeorology 10, no. 1 (February 1, 2009): 338–46. http://dx.doi.org/10.1175/2008jhm883.1.

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Abstract This paper describes the airborne data collected during the 2002 and 2003 Cold Land Processes Experiment (CLPX). These data include gamma radiation observations, multi- and hyperspectral optical imaging, optical altimetry, and passive and active microwave observations of the test areas. The gamma observations were collected with the NOAA/National Weather Service Gamma Radiation Detection System (GAMMA). The CLPX multispectral optical data consist of very high-resolution color-infrared orthoimagery of the intensive study areas (ISAs) by TerrainVision. The airborne hyperspectral optical

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Maki, Masayuki, Masato Iguchi, Takeshi Maesaka, Takahiro Miwa, Toshikazu Tanada, Tomofumi Kozono, Tatsuya Momotani, Akihiko Yamaji, and Ikuya Kakimoto. "Preliminary Results of Weather Radar Observations of Sakurajima Volcanic Smoke." Journal of Disaster Research 11, no. 1 (February 1, 2016): 15–30. http://dx.doi.org/10.20965/jdr.2016.p0015.

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Preliminary results of quantitative analysis of volcanic ash clouds observed over the Sakurajima volcano in Kagoshima, Japan, were obtained by using weather radar and surface instruments. The Ka-band Doppler radar observations showed the inner structure of a volcanic ash column every two minutes after an eruption. Operational X-band polarimetric radar provides information on three-dimensional ash fall amount distribution. The terminal fall velocity of ash particles was studied by using optical disdrometers, together with the main specifications of observation instruments.

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Safargaleev, V., A. Kozlovsky, T. Sergienko, T. K. Yeoman, M. Uspensky, D. M. Wright, H. Nilsson, T. Turunen, and A. Kotikov. "Optical, radar, and magnetic observations of magnetosheath plasma capture during a positive IMF Bz impulse." Annales Geophysicae 26, no. 3 (March 26, 2008): 517–31. http://dx.doi.org/10.5194/angeo-26-517-2008.

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Abstract. We present a multi-instrument study of the ionospheric response to a northward turning of the IMF. The observations were made in the near-noon (11:00 MLT) sector on Svalbard (at 75° MLAT). The data set includes auroral observations, ionospheric flows obtained from the EISCAT and CUTLASS radars, the spectral width of the HF radar backscatter, particle precipitation and plasma flow data from the DMSP F13 satellite, and Pc1 frequency band pulsations observed by induction magnetometers. Careful collocation of all the observations has been made with the HF radar backscatter located by a r

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Sekar, R., D. Chakrabarty, R. Narayanan, S. Sripathi, A. K. Patra, and K. S. V. Subbarao. "Characterization of VHF radar observations associated with equatorial Spread F by narrow-band optical measurements." Annales Geophysicae 22, no. 9 (September 23, 2004): 3129–36. http://dx.doi.org/10.5194/angeo-22-3129-2004.

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Abstract. The VHF radars have been extensively used to investigate the structures and dynamics of equatorial Spread F (ESF) irregularities. However, unambiguous identification of the nature of the structures in terms of plasma depletion or enhancement requires another technique, as the return echo measured by VHF radar is proportional to the square of the electron density fluctuations. In order to address this issue, co-ordinated radar backscatter and thermospheric airglow intensity measurements were carried out during March 2003 from the MST radar site at Gadanki. Temporal variations of 630.0

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Ostro, S. J. "Radar and Optical Observations of Asteroid 1998 KY26." Science 285, no. 5427 (July 23, 1999): 557–59. http://dx.doi.org/10.1126/science.285.5427.557.

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Thèses sur le sujet "Optical radar Observations"

Ward, Andrew Craig. "Modified convective models using wind, turbulence and dispersion information for an inland region with complex terrain : thesis." Thesis, Queensland University of Technology, 1991. https://eprints.qut.edu.au/35975/1/35975_Ward_1991.pdf.

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Four dispersion models have been investigated using data from a variety of sites. The models consisted of a standard Gaussian model, a Gaussian model modified for Australian conditions by the incorporation of empirical formulations for plume rise and spread, and two convective models. Comparison of the models' predictions with laboratory results suggested that the convective models generally were able to predict better the variation of concentration with distance and buoyancy. Residual analyses were used to examine model biases. A performance measure and a ranking procedure were deve

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Lane, Dallas W. "Signal processing methods for airborne lidar bathymetry." Title page, table of contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09ENS/09ensl265.pdf.

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"August 2001." Includes bibliographical references (leaves 77-80). Examines the susceptibility of existing signal processing methods to errors and identifies other possible causes of depth error not accounted for by existing signal processing methods, by analysis of the detected laser return waveform data. Methods to improve depth accuracy are investigated.

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Kozlovsky, Alexander. "Structure and dynamics of the magnetosphere inferred from radar and optical observations at high latitudes /." Oulu : Oulu university press, 2002. http://catalogue.bnf.fr/ark:/12148/cb410819360.

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Amazirh, Abdelhakim. "Monitoring crops water needs at high spatio-temporal resolution by synergy of optical/thermal and radar observations." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30101.

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L'optimisation de la gestion de l'eau en agriculture est essentielle dans les zones semi-arides afin de préserver les ressources en eau qui sont déjà faibles et erratiques dues à des actions humaines et au changement climatique. Cette thèse vise à utiliser la synergie des observations de télédétection multispectrales (données radar, optiques et thermiques) pour un suivi à haute résolution spatio-temporelle des besoins en eau des cultures. Dans ce contexte, différentes approches utilisant divers capteurs (Landsat-7/8, Sentinel-1 et MODIS) ont été developpées pour apporter une information sur l'

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Woithe, Jonathan Mark. "Optical studies of the mesospheric region." Title page, contents and abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09PH/09phw847.pdf.

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Includes copies of articles co-authored by the author during the preparation of this thesis. Includes bibliographical references (leaves 233-245). A three-field photometer was employed at the University of Adelaide's Buckland Park field site to collect optical observations of the 557.7nm OI and 730nm OH airglow emissions on an almost continuous basis since May 1995 to May 2000, with observations made whenever the moon was not up.

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Taniguchi, Kyoko. "Characterization of water vapor within the planetary boundary layer based on the ARM raman lidar observation at the SGP site." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1445054161&sid=18&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Gottardi, Beatrice. "Automatic methods for crop classification by merging satellite radar (sentinel 1) and optical (sentinel 2) . data and artificial intelligence analysis." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20635/.

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Land use and land cover maps can support our understanding of coupled human- environment systems and provide important information for environmental modelling and water resource management. Satellite data are a valuable source for land use and land cover mapping. However, cloud-free or weather independent data are necessary to map cloud-prone regions. Merging radar with optical images would increase the accuracy of the study. Agricultural land cover is characterized by strong variations within relatively short time intervals. These dynamics are challenging for land cover classifications on th

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Einfalt, Thomas. "Recherche d'une methode optimale de prevision de pluie par radar en hydrologie urbaine." Marne-la-vallée, ENPC, 1988. http://www.theses.fr/1988ENPCA007.

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Cette these a pour objet le premier developpement d'une methode de prevision de pluie par radar adaptee aux objectifs de l'hydrologie urbaine. Une revue des travaux effectues sur la prevision de pluie dans les vingt dernieres annees a ete accomplie. Les algorithmes prometteurs utilises dans les etudes precedentes ont ete selectionnes et ameliores en vue des objectifs de l'application envisagee: - concentration sur les fortes pluies; temps de calcul inferieur a 60 secondes sur mini-ordinateur; controle de qualite de la prevision. De cette analyse a emerge une nouvelle methode de prevision. Une

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Einfalt, Thomas. "Recherche d'une méthode optimale de prévision de pluie par radar en hydrologie urbaine." Phd thesis, Ecole Nationale des Ponts et Chaussées, 1988. http://tel.archives-ouvertes.fr/tel-00520784.

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Cette thèse a pour objet le premier développement d'une méthode de prévision de pluie par radar adaptée aux objectifs de l'hydrologie urbaine. Une revue des travaux effectués sur la prévision de pluie dans les vingt dernières années a été accomplie. Les algorithmes prometteurs utilisés dans les études précédentes ont été sélectionnés et améliorés en vue des objectifs de l'application envisagée : - concentration sur les fortes pluies ; temps de calcul inférieur a 60 secondes sur mini-ordinateur ; contrôle de qualité de la prévision. De cette analyse a émergé une nouvelle méthode de prévision. U

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Lane, Dallas W. "Signal processing methods for airborne lidar bathymetry." Thesis, 2001. http://hdl.handle.net/2440/122417.

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Examines the susceptibility of existing signal processing methods to errors and identifies other possible causes of depth error not accounted for by existing signal processing methods, by analysis of the detected laser return waveform data. Methods to improve depth accuracy are investigated. Thesis (M.Eng.Sc.) -- University of Adelaide, Dept. of Electrical and Electronic Engineering, 2002?

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Livres sur le sujet "Optical radar Observations"

Spinhirne, J. D. ER-2 lidar observations from the October 1986 FIRE cirrus experiment. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 1989.

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Spinhirne, J. D. ER-2 lidar observations from the October 1986 FIRE cirrus experiment. Greenbelt, Md: National Aeronautics and Space Administration, Goddard Space Flight Center, 1989.

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Eberhard, W. L. Lidar observations of stratospheric aerosols in 1988 at Boulder, Colorado. Boulder, Colo: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1989.

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Eberhard, Wynn. Lidar observations of stratospheric aerosols in 1988 at Boulder, Colorado. Boulder, Colo: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, 1989.

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Jun, Zhou. Lidar observations of the stratospheric aerosol: Boulder, Colorado, 1985 to 1987. Boulder, Colo: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, Wave Propagation Laboratory, 1989.

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Chou, Chumlun. Lidar observations of the stratospheric aerosol: Boulder, Colorado, 1985 to 1987. Boulder, Colo: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, Wave Propagation Laboratory, 1989.

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Zakharov, V. M. Lidary i issledovanie klimata. Leningrad: Gidrometeoizdat, 1990.

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International Laser Radar Conference (24th 2008 Boulder, Colo.). Reviewed and revised papers presented at the 24th International Laser Radar Conference: Boulder, Colorado, 23-27 June 2008. [United States]: International Laser Radar Conference, 2008.

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International, Laser Radar Conference (13th 1986 Toronto Ont ). Thirteenth International Laser Radar Conference: Abstracts of papers presented at the conference. Washington, D.C: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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Chapitres de livres sur le sujet "Optical radar Observations"

Hysell, David L., Tatsuhiro Yokoyama, Elnana Nossa, Russell B. Hedden, Miguel F. Larsen, John Munro, Steven Smith, Michael P. Sulzer, and Sixto A. González. "Radar and Optical Observations of Irregular Midlatitude Sporadic E Layers Beneath MSTIDs." In Aeronomy of the Earth's Atmosphere and Ionosphere, 269–81. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0326-1_19.

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Brown, P., M. D. Campbell, K. J. Ellis, R. L. Hawkes, J. Jones, P. Gural, D. Babcock, et al. "Global Ground-Based Electro-Optical and Radar Observations of the 1999 Leonid Shower: First Results." In Leonid Storm Research, 167–90. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-2071-7_13.

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Lausch, Angela, Marco Heurich, Paul Magdon, Duccio Rocchini, Karsten Schulz, Jan Bumberger, and Doug J. King. "A Range of Earth Observation Techniques for Assessing Plant Diversity." In Remote Sensing of Plant Biodiversity, 309–48. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-33157-3_13.

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AbstractVegetation diversity and health is multidimensional and only partially understood due to its complexity. So far there is no single monitoring approach that can sufficiently assess and predict vegetation health and resilience. To gain a better understanding of the different remote sensing (RS) approaches that are available, this chapter reviews the range of Earth observation (EO) platforms, sensors, and techniques for assessing vegetation diversity. Platforms include close-range EO platforms, spectral laboratories, plant phenomics facilities, ecotrons, wireless sensor networks (WSNs), towers, air- and spaceborne EO platforms, and unmanned aerial systems (UAS). Sensors include spectrometers, optical imaging systems, Light Detection and Ranging (LiDAR), and radar. Applications and approaches to vegetation diversity modeling and mapping with air- and spaceborne EO data are also presented. The chapter concludes with recommendations for the future direction of monitoring vegetation diversity using RS.

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Liou, K. N., and Y. Gu. "Radiative Transfer in Cirrus Clouds: Light Scatting and Spectral Information." In Cirrus. Oxford University Press, 2002. http://dx.doi.org/10.1093/oso/9780195130720.003.0017.

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The importance of cirrus clouds in climate has been recognized in the light of a number of intensive composite field observations: the First ISCCP Regional Experiment (FIRE) I in October-November 1986; FIRE II in November-December 1991; the European experiment on cirrus (ICE/EUCREX) in 1989; Subsonic Aircraft: Contrail and Cloud Effect Special Study (SUCCESS) in April 1996. Based on observations from the ground-based lidar and radar, airborne instrumentation, and satellites, cirrus clouds are typically located in the upper troposphere and lower stratosphere (Liou 1986). The formation, maintenance, and dissipation of cirrus clouds are directly associated with synoptic and mesoscale disturbances as well as related to deep cumulus outflows. Increases of high cloud cover have been reported at a number of urban airports in the United States based on surface observations spanning 40 years (Liou et al. 1990; Frankel et al. 1997). These increases have been attributed to the contrails and water vapor produced by jet airplane traffic. Satellite observations from NOAA polar-orbiting High-Resolution Infrared Radiation Sounder (HIRS) using the CO2 slicing method (Wylie et al. 1994) also show that cirrus cloud cover substantially increased between 60° S and 60° N during a 4-year period from June 1989 to September 1993. Understanding the role of cirrus clouds in climate must begin with reliable modeling of their radiative properties for incorporation in climate models as well as determination of the global variability of their composition, structure, and optical properties. Development of the remote sensing methodologies for the detection and retrieval of the ubiquitous visible and subvisual cirrus clouds requires the basic scattering, absorption, and polarization data for ice crystals in conjunction with appropriate radiative transfer models. We present the fundamentals involving radiative transfer in cirrus clouds and review pertinent research. In section 13.1, an overview of the subject of light scattering by ice crystals is presented in which we discuss a unification of the geometric optics approach for large ice particles and the finite-difference time domain numerical solution for small ice particles, referred to as the unified theory. Section 13.2 presents radiative transfer in cirrus clouds involving two unique properties: orientation of nonspherical ice crystals and cloud inhomogeneity.

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"Geometric Optics Approximation to the Wave Equation." In Doppler Radar and Weather Observations, 518–19. Elsevier, 1993. http://dx.doi.org/10.1016/b978-0-12-221422-6.50020-6.

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Actes de conférences sur le sujet "Optical radar Observations"

Li, Yunlong, Peter Hoogeboom, and Herman Russchenberg. "Observations and modeling of fog by cloud radar and optical sensors." In 2014 European Radar Conference (EuRAD). IEEE, 2014. http://dx.doi.org/10.1109/eurad.2014.6991322.

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Long, David G., Ivan S. Ashcraft, and Jeremy B. Luke. "Radar scatterometer observations of sastrugi on the great ice sheets." In Optical Science and Technology, SPIE's 48th Annual Meeting, edited by William L. Barnes. SPIE, 2003. http://dx.doi.org/10.1117/12.506291.

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Yunlong Li, Peter Hoogeboom, and Herman Russchenberg. "Observations and modeling of fog by cloud radar and optical sensors." In 2014 44th European Microwave Conference (EuMC). IEEE, 2014. http://dx.doi.org/10.1109/eumc.2014.6986814.

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Eaton, Frank D., Gregory D. Nastrom, Demos T. Kyrazis, Don G. Black, Wiley T. Black, and R. Alastair Black. "Preliminary VHF radar and high-data-rate optical turbulence profile observations using a balloon-ring platform." In SPIE Optical Engineering + Applications, edited by Stephen M. Hammel, Alexander M. J. van Eijk, and Mikhail A. Vorontsov. SPIE, 2009. http://dx.doi.org/10.1117/12.827294.

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Ermakov, Stanislav, Ivan Kapustin, Irina Sergievskaya, and Jose da Silva. "Spreading of oil films on the sea surface: radar/optical observations and physical mechanisms." In SPIE Remote Sensing, edited by Charles R. Bostater, Stelios P. Mertikas, and Xavier Neyt. SPIE, 2015. http://dx.doi.org/10.1117/12.2195004.

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Bahrami, Hazhir, Saeid Homayouni, Masoud Mahdianpari, and Abdolreza Safari. "Ensemble Learning for Crop Monitoring from Multitemporal Optical and Synthetic Aperture Radar Earth Observations." In IGARSS 2021 - 2021 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2021. http://dx.doi.org/10.1109/igarss47720.2021.9555121.

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Ermakov, S., I. Kapustin, and T. Lazareva. "Ship wake signatures in radar/optical images of the sea surface: observations and physical mechanisms." In SPIE Remote Sensing, edited by Charles R. Bostater, Stelios P. Mertikas, and Xavier Neyt. SPIE, 2014. http://dx.doi.org/10.1117/12.2067367.

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Dmitriev, A. V., T. N. Chimitdorzhiev, P. N. Dagurov, and I. I. Kirbizhekova. "Optical and microwave observation of forest restoration after abnormal fires." In Spatial Data Processing for Monitoring of Natural and Anthropogenic Processes 2021. Crossref, 2021. http://dx.doi.org/10.25743/sdm.2021.12.58.008.

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The paper discusses the possibility of a forest undergrowth detecting with help of polarimetric decompositions and time series analysis of ALOS-2/PALSAR-2 and Sentinel-1 radar images. The presented results show principal possibility of confidently identifying the growth of forest stands.

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Charlesworth, Peter D. "RAPTOR: radar plus thermal observation and recognition system." In SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, edited by Bjorn F. Andresen and Marija Strojnik. SPIE, 1995. http://dx.doi.org/10.1117/12.218291.

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Dodin, P., and P. Belanger. "Optimal observation trajectory of an active maneuvering radar." In 2005 7th International Conference on Information Fusion. IEEE, 2005. http://dx.doi.org/10.1109/icif.2005.1591908.

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Rapports d'organisations sur le sujet "Optical radar Observations"

Egeland, Alv, and Joeran Moen. Combined Svalbard EISCAT Radar and Optical Observation for Polar Cusp/Cap Research. Fort Belvoir, VA: Defense Technical Information Center, October 2000. http://dx.doi.org/10.21236/ada388178.

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