Survey of Airborne Sensors
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[1] D. Vidal-Madjar,et al. Evaluation of calibration methods for a helicopter-borne microwave scatterometer , 1995 .
[2] J. M. Livingston,et al. Aerosol spectral optical depths: Jet fuel and forest fire smokes , 1990 .
[3] Giovanni Alberti,et al. The TOPSAR interferometric radar topographic mapping instrument , 1992, IEEE Trans. Geosci. Remote. Sens..
[4] Peter H. Hildebrand,et al. Feasibility Test of an Airborne Pulse-Doppler Meteorological Radar. , 1983 .
[5] N.J.S. Stacy,et al. Ingara: the Australian Airborne Imaging Radar System , 1994, Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium.
[6] Catherine Prigent,et al. Aircraft measurements of water vapour continuum absorption at millimetre wavelengths , 1994 .
[7] J.S. Verdi,et al. A Description of the Nadc Sar Facility and Examples of Observations and Measurements , 1991, [Proceedings] IGARSS'91 Remote Sensing: Global Monitoring for Earth Management.
[8] Michael Spanner,et al. Determination of atmospheric optical properties during the First International Satellite Land Surface Climatology Project Field Experiment , 1990 .
[9] P. Pilewskie,et al. Pinatubo and pre‐Pinatubo optical‐depth spectra: Mauna Loa measurements, comparisons, inferred particle size distributions, radiative effects, and relationship to lidar data , 1993 .
[10] Klaus Pfeilsticker,et al. Groundbased spectroscopic measurements of stratospheric NO2 and OClO in Arctic winter 1989/90 , 1993 .
[11] Jost Heintzenberg,et al. Water Vapor, Condensed Water, and Crystal Concentration in Orographically Influenced Cirrus Clouds , 1994 .
[12] Catherine Prigent,et al. Observations of water vapour absorption using airborne microwave radiometers at 89 and 157 GHz , 1995, 1995 International Geoscience and Remote Sensing Symposium, IGARSS '95. Quantitative Remote Sensing for Science and Applications.
[13] Gerhard H. Ruppersberg,et al. Comparison of Cirrus Height and Optical Depth Derived from Satellite and Aircraft Measurements , 1993 .
[14] Klaus Pfeilsticker,et al. The Minihole event on 6. Feb. 1990: Influence of Mie-scattering on the evaluation of spectroscopic , 1993 .
[15] Michael D. King,et al. Optical properties of marine stratocumulus clouds modified by ships , 1993 .
[16] Frank Arnold,et al. A novel aircraft‐based tandem mass spectrometer for atmospheric ion and trace gas measurements , 1993 .
[17] Eric A. Smith,et al. High-resolution imaging of rain systems with the advanced microwave precipitation radiometer , 1994 .
[18] Tatsuharu Kobayashi,et al. The design and development of airborne high-resolution topographic imaging radar in CRL , 1995, 1995 International Geoscience and Remote Sensing Symposium, IGARSS '95. Quantitative Remote Sensing for Science and Applications.
[19] Susanne Crewell,et al. ASUR-an airborne SIS receiver for atmospheric measurements of trace gases at 625 to 760 GHz , 1995 .
[20] Paul L. Baker,et al. Aircraft and satellite measurement of ocean wave directional spectra using scanning-beam microwave radars , 1985 .
[21] D. Vidal-Madjar,et al. Data Processing and Calibration for an Airborne Scatterometer , 1986, IEEE Transactions on Geoscience and Remote Sensing.
[22] Jost Heintzenberg,et al. In situ sampling of clouds with a droplet to aerosol converter , 1985 .
[23] D. L. Light,et al. The national aerial photography program as a geographic informaiton system resource , 1993 .
[24] Michael D. King,et al. Directional and Spectral Reflectance of the Kuwait Oil-Fire Smoke , 1992 .
[25] Steven A. Ackerman,et al. Comparison of broadband and high-spectral resolution infrared observations , 1993 .
[26] Peter H. Hildebrand,et al. The ELDORA/ASTRAIA airborne Doppler weather radar: goals, design, and first field tests , 1994, Proc. IEEE.
[27] David P. Jorgensen,et al. Mesoscale and Convective-Scale Characteristics of Mature Hurricanes. Part II. Inner Core Structure of Hurricane Allen (1980) , 1984 .
[28] Paul Snoeij,et al. Project PHARUS: Towards a polarimetric C-band airborne SAR , 1989 .
[29] J. Mead,et al. 95-GHz Polarimetric Radar Measurements of Orographic Cap Clouds , 1994 .
[30] Robert T. Menzies,et al. Multi-center Airborne Coherent Atmospheric Wind Sensor , 1998, Optical Remote Sensing of the Atmosphere.
[31] S. M. Till. Airborne electro‐optical sensors for resource management , 1987 .
[32] C. Kiemle,et al. Airborne remote sensing of tropospheric water vapor with a near-infrared differential absorption lidar system. , 1993, Applied optics.
[33] Rudolf Richter,et al. 79-channel airborne imaging spectrometer , 1993, Defense, Security, and Sensing.
[34] Fuk K. Li,et al. ARMAR observations during TOGA/COARE , 1994, Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium.
[35] William Viezee,et al. Airborne Lidar Tracking of Fluorescent Tracers for Atmospheric Transport and Diffusion Studies , 1985 .
[36] R. Swift,et al. Oil film thickness measurement using airborne laser-induced water Raman backscatter. , 1980, Applied optics.
[37] Paul Snoeij,et al. The PHARUS project, results of the definition study including the SAR testbed PHARS , 1992, IEEE Trans. Geosci. Remote. Sens..
[38] Christian Werner,et al. Multiple-scattering lidar experiments , 1992 .
[39] Thomas G. Chrien,et al. Evolution of the Airborne Visible/Infrared Imaging Spectrometer flight and ground data processing system , 1990, Other Conferences.
[40] Hiroshi Kumagai,et al. Airborne active and passive microwave observations of Super Typhoon Flo , 1994, IEEE Trans. Geosci. Remote. Sens..
[41] S. Klooster,et al. The Airborne Ocean Color Imager - System description and image processing , 1992 .
[42] Franz Schreier,et al. Observation of stratospheric OH at 2.5 THz with an airborne heterodyne system , 1995 .
[43] T. Clarmann,et al. Determination of the stratospheric organic chlorine budget in the spring arctic vortex from MIPAS B limb emission spectra and air sampling experiments , 1995 .
[44] Jeff Lillycrop,et al. Advancements in the U.S. army corps of engineers hydrographic survey capabilities: The SHOALS system , 1992 .
[45] Michael D. King,et al. Multiwavelength scanning radiometer for airborne measurements of scattered radiation within clouds , 1986 .
[46] Serpil Ayasli,et al. SAR foliage penetration phenomenology of tropical rain forest and northern US forest , 1995, Proceedings International Radar Conference.
[47] Michael D. King,et al. Determination of the Spectral Absorption of Solar Radiation by Marine Stratocumulus Clouds from Airborne Measurements within Clouds , 1990 .
[48] William Viezee,et al. Airborne Lidar Observations during AGASP-2 , 1990 .
[49] A. Gustavsson,et al. The airborne VHF SAR system CARABAS , 1993, Proceedings of IGARSS '93 - IEEE International Geoscience and Remote Sensing Symposium.
[50] R. A. Neville,et al. Design of SFSI: An Imaging Spectrometer in the SWIR , 1992 .
[51] Gerhard Ehret,et al. Airborne DIAL remote sensing of the arctic ozone layer , 1992, Other Conferences.
[52] S Rahm,et al. Measurement of a wind field with an airborne continuous-wave Doppler lidar. , 1995, Optics letters.
[53] William H. Brune,et al. Measurement of tropospheric OH and HO2 by laser‐induced fluorescence at low pressure , 1994 .
[54] Pavel Hajek,et al. Improvements to the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) calibration system , 1994, Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium.
[55] Alan B. Tanner,et al. Calibration of a synthetic aperture radiometer , 1993, IEEE Trans. Geosci. Remote. Sens..
[56] G. Giordano,et al. Preliminary Results Of The ISM Campaign - The Landes, South West France , 1992, [Proceedings] IGARSS '92 International Geoscience and Remote Sensing Symposium.
[57] Timothy L. Crawford,et al. Spatial and temporal variability of heat, water vapor, carbon dioxide, and momentum air-sea exchange in a coastal environment , 1993 .
[58] Hermann Oelhaf,et al. Retrieval of stratospheric O3, HNO3 and ClONO2 profiles from 1992 MIPAS‐B limb emission spectra: Method, results, and error analysis , 1993 .
[59] Philip W. Dabney,et al. Remote sensing of the Earth's surface with an airborne polarized laser , 1993, IEEE Trans. Geosci. Remote. Sens..
[60] R.A.A. Blackman. The remote sensing of oil slicks , 1991 .
[61] Serpil Ayasli,et al. Results on ground penetration SAR phenomenology from June 1993 Yuma experiment , 1995, Proceedings International Radar Conference.
[62] Paul Hartogh,et al. Remote sensing of ClO and HCl over northern Scandinavia in winter 1992 with an airborne submillimeter radiometer , 1995 .
[63] Danièle Hauser,et al. RESSAC: a new airborne FM/CW radar ocean wave spectrometer , 1992, IEEE Trans. Geosci. Remote. Sens..
[64] John C. Henry,et al. Lincoln Laboratory millimeter-wave synthetic aperture radar imaging system , 1992, Photonics West - Lasers and Applications in Science and Engineering.
[65] Franklin P. Mills,et al. Airborne and spaceborne thermal multispectral remote sensing , 1991, Defense, Security, and Sensing.
[66] B. Vowinkel,et al. A New Passive Microwave Linescanner for Airborne Measurements of Maritime Oil Pollutions. , 1992 .
[67] C. L. Parsons,et al. Off-nadir radar altimetry , 1989 .
[68] H. Masuko,et al. Airborne microwave rain-scatterometer /radiometer , 1982 .
[69] R. D. Becker,et al. Airborne GPS for photo navigation and photogrammetry: an integrated approach , 1993 .
[70] G Taubes. NASA Launches a 5-Year Plan to Clone Drones , 1993, Science.
[71] Darrel L. Williams,et al. An off-nadir-pointing imaging spectroradiometer for terrestrial ecosystem studies , 1991, IEEE Trans. Geosci. Remote. Sens..
[72] Frank E. Hoge,et al. Photosynthetic accessory pigments - Evidence for the influence of phycoerythrin on the submarine light field , 1990 .
[73] Edward E. Uthe. Elastic scattering, fluorescent scattering, and differential absorption airborne lidar observations of atmospheric tracers , 1991 .
[74] G. Toon. The JPL MkIV interferometer , 1991 .
[75] R. Reuter,et al. Lidar fluorosensing of mineral oil spills on the sea surface. , 1990, Applied optics.
[76] F. Witte. The Archimedes IIa Experiment Remote Sensing of Oil Spills in the North-Sea , 1991 .
[77] Susanne Crewell,et al. Comparison of ClO measurements by airborne and spaceborne microwave radiometers in the Arctic winter stratosphere 1993 , 1995 .
[78] S. Strahan,et al. Nitrous oxide as a dynamic tracer in the 1987 airborne Antarctic ozone experiment , 1988, Annual Meeting Optical Society of America.
[79] H. Röser,et al. Heterodyne spectroscopy for submillimeter and far-infrared wavelengths from 100 μm to 500 μm , 1991 .
[80] Robert E. McIntosh,et al. An airborne 95 GHz dual-polarized radar for cloud studies , 1994, IEEE Trans. Geosci. Remote. Sens..
[81] T. Klüpfel,et al. Ground‐based UV‐VIS spectroscopy: Diurnal OCIO‐profiles during January 1990 above Søndre Strømfjord, Greenland , 1991 .
[82] L.S. Fedor,et al. Airborne dual-channel radiometric ocean surface observations during SCOPE 93 , 1994, Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium.
[83] D.M. Le Vine,et al. L-band synthetic aperture radiometers for Earth remote sensing , 1994, Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium.
[84] Bruce Rafert,et al. SMIFTS: a cryogenically cooled, spatially modulated imaging infrared interferometer spectrometer , 1993, Defense, Security, and Sensing.
[85] Albin J. Gasiewski,et al. Aircraft-based Radiometric Imaging of Tropospheric Temperature and Precipitation Using the 118.75-GHz Oxygen Resonance , 1990 .
[86] Hermann Oelhaf,et al. Column amounts of trace gases derived from ground‐based measurements with MIPAS during CHEOPS III , 1991 .
[87] Alessandro Tibaldi,et al. Computer processing of satellite data for geostructural zoning of a collisional boundary, significance and field checks: The example of Tunisia , 1988 .
[88] Michael H. Francis,et al. A Dual-Frequency Millimeter-Wave Radiometer Antenna for Airborne MISC Sensing of Atmosphere and Ocean , 1994 .
[89] Juha Hyyppä,et al. A helicopter-borne eight-channel ranging scatterometer for remote sensing. I. System description , 1993, IEEE Trans. Geosci. Remote. Sens..
[90] D. L. Bickel,et al. Interferometric SAR phase difference calibration: methods and results , 1994, Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium.
[91] Herbert Fischer,et al. Remote Sensing of Atmospheric Trace Gases , 1993 .
[92] L. Frush,et al. Ground-based Velocity-measurement Performance of the NCAR Airborne Infrared Lidar System (NAILS) , 1994 .
[93] Robert A. Neville,et al. SFSI: Canada's First Airborne SWIR Imaging Spectrometer , 1995 .
[94] William L. Smith,et al. GHIS—The GOES High-Resolution Interferometer Sounder , 1990 .
[95] Kurt R. Koppari,et al. Experimental evaluation of an airborne depth-sounding lidar , 1993 .
[96] R. Dobosy,et al. A sensitive fast-response probe to measure turbulence and heat flux from any airplane , 1992 .
[97] Tilden P. Meyers,et al. An open path, fast response infrared absorption gas analyzer for H2O and CO2 , 1992 .
[98] R. L. Schwiesow,et al. The NCAR Airborne Infrared Lidar System: Status and Applications , 1996 .
[99] W. Wiesbeck,et al. The new dual frequency (C- and L-band) TOPSAR airborne interferometric SAR , 1995, 1995 International Geoscience and Remote Sensing Symposium, IGARSS '95. Quantitative Remote Sensing for Science and Applications.
[100] B. Guenther,et al. Calibration Results for NOAA-11 AVHRR Channels 1 and 2 from Congruent Path Aircraft Observations , 1993 .
[101] M. E. Reinhardt,et al. Measurements of jet aircraft emissions at cruise altitude I: The odd‐nitrogen gases NO, NO2, HNO2 and HNO3 , 1992 .
[102] C. Wamser,et al. New airborne line scanner systems for high resolution sea ice observation , 1994 .
[103] S P Palm,et al. New airborne scanning lidar system: applications for atmospheric remote sensing. , 1994, Applied optics.
[104] R. Reuter,et al. Oceanographic laser remote sensing: measurement of hydrographic fronts in the German Bight and in the Northern Adriatic Sea , 1993 .
[105] J. Streicher,et al. A diode-pumped Nd: YAG lidar for airborne cloud measurements , 1993 .
[106] M. Martin-Neira,et al. MIRAS, a two-dimensional aperture synthesis radiometer , 1994, Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium.
[107] Steven A. Ackerman,et al. Remote sensing cloud properties from high spectral resolution infrared observations , 1993 .
[108] Peter Haschberger,et al. A New Sensor for Airborne Monitoring of Exhaust Emissions , 1994 .
[109] M. King,et al. Determination of the Optical Thickness and Effective Particle Radius of Clouds from Reflected Solar Radiation Measurements. Part II: Marine Stratocumulus Observations , 1991 .
[110] C. J. Baker,et al. Grazing angle dependency of SAR imagery , 1992 .
[111] H. B. Howell,et al. Radiometric calibration of IR Fourier transform spectrometers: solution to a problem with the High-Resolution Interferometer Sounder. , 1988, Applied optics.
[112] T. D. Clem,et al. Airborne lidar for profiling of surface topography , 1991 .
[113] David F. Jorgensen. Mesoscale and Convective-Scale Characteristics of Mature Hurricanes. Part I: General Observations by Research Aircraft , 1984 .
[114] David S. McKay,et al. Cosmic dust catalog , 1997 .
[115] R. Peter,et al. Stratospheric and mesospheric water vapor distribution over Northern Europe measured with an airborne mm-wave sensor , 1994, Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium.
[116] J. Thomas Zenker,et al. Dual-channel two-tone frequency modulation tunable diode laser spectrometer for ground-based and airborne trace gas measurements , 1994, Other Conferences.
[117] James D. Spinhirne,et al. Visible and near IR lidar backscatter observations on the GLOBE Pacific Survey missions , 1991 .
[118] R. D. Averill,et al. A Lidar Instrument To Measure H2O And Aerosol Profiles From The NASA ER-2 Aircraft , 1986, Other Conferences.
[119] D. L. Light,et al. Characteristics of remote sensors for mapping and earth science applications , 1990 .
[120] Hermann Oelhaf,et al. Observations of the stratospheric composition with the balloon-borne and space-based MIPAS limb emission sounders , 1995, 1995 International Geoscience and Remote Sensing Symposium, IGARSS '95. Quantitative Remote Sensing for Science and Applications.
[121] R. F. Rawson,et al. Polarimetric X/L/C-band SAR , 1988, Proceedings of the 1988 IEEE National Radar Conference.
[122] Douglas C. Vandemark,et al. Topographic mapping using a multibeam radar altimeter , 1994, IEEE Trans. Geosci. Remote. Sens..
[123] W. Krichbaumer. Airborne Cloud Measurements with the DLR-Microlidar during the CLEOPATRA Campaign , 1996 .
[124] F. E. Grahek,et al. A Small, Low Flow, High Sensitivity Reaction Vessel for NO Chemiluminescence Detectors , 1990 .
[125] W. Renger,et al. Atmospheric Aerosol and Humidity Profiling Using an Airborne DIAL System in the Near IR. , 1990 .
[126] R. May,et al. Aircraft (ER-2) laser infrared absorption spectrometer (ALIAS) for in-situ stratospheric measurements of HCI, N(2)O, CH(4), NO(2), and HNO(3). , 1994, Applied optics.
[127] A. V. Smirnov,et al. Polarimetric radar imagery of the ocean at low grazing angles under atmospheric conditions of variable stability , 1994, Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium.
[128] Paul Racette,et al. Profiling of atmospheric water vapor with MIR and SSM/T-2 measurements , 1995, 1995 International Geoscience and Remote Sensing Symposium, IGARSS '95. Quantitative Remote Sensing for Science and Applications.
[129] David S. Covert,et al. Design and Calibration of a Counterflow Virtual Impactor for Sampling of Atmospheric Fog and Cloud Droplets , 1988 .
[130] Shuichi Rokugawa,et al. Estimation of land surface characteristics using an airborne ASTER simulator , 1993, Proceedings of IGARSS '93 - IEEE International Geoscience and Remote Sensing Symposium.
[131] F. E. Grahek,et al. A small, high-sensitivity, medium-response ozone detector suitable for measurements from light aircraft , 1992 .
[132] R. Beal. Directional Ocean Wave Spectra , 1991 .
[133] K. Staenz,et al. A Decade of Imaging Spectrometry in Canada , 1992 .
[134] C. Swift,et al. Initial Results In The Development Of A Synthetic Aperture Microwave Radiometer , 1990 .
[135] Calvin T. Swift,et al. A multifrequency microwave radiometer of the future , 1989 .
[136] Robert J. Charlson,et al. Development of a new real-time method for measuring S(IV) in cloud water using a counter-flow virtual impactor , 1994 .
[137] C. Anger,et al. CCD-Based Imaging Spectroscopy for Remote Sensing: The FLI and CASI Programs , 1992 .
[138] F. Friedl-Vallon,et al. The new balloon-borne MIPAS-B2 limb emission sounder , 1995, 1995 International Geoscience and Remote Sensing Symposium, IGARSS '95. Quantitative Remote Sensing for Science and Applications.
[139] R. K. Hawkins,et al. The CCRS Airborne SAR Systems: Radar for Remote Sensing Research , 1995 .
[140] R A Neville,et al. Wide-angle high-resolution line-imager prototype flight test results. , 1992, Applied optics.
[141] Gerhard Ehret,et al. Airborne Lidar for Atmospheric Research in the Arctic. , 1990 .
[142] Simon Yueh,et al. Polarimetric measurements of sea surface brightness temperatures using an aircraft K-band radiometer , 1995, IEEE Trans. Geosci. Remote. Sens..
[143] N. B. Nielsen,et al. Airborne lidar measurements of smoke plume distribution, vertical transmission, and particle size. , 1982, Applied optics.
[144] Klaus Pfeilsticker,et al. Airborne measurements during the Arctic Stratospheric Experiment: Observation of O3 and NO2 , 1994 .
[145] D. Jorgensen,et al. Multi-beam techniques for deriving wind fields from airborne doppler radars , 1996 .
[146] J. Carswell,et al. Backscatter from the ocean surface under low wind conditions , 1994, Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium.
[147] Annick Bricaud,et al. The POLDER mission: instrument characteristics and scientific objectives , 1994, IEEE Trans. Geosci. Remote. Sens..
[148] Tak Matsumoto,et al. Airborne Tracking Sunphotometer , 1987 .
[149] Johann Bodechtel,et al. Imaging spectroscopy: fundamentals and prospective applications. , 1992 .
[150] H. Smid,et al. A new sensor system for airborne measurements of maritime pollution and of hydrographic parameters , 1991 .
[151] Jean-Philippe Hardange,et al. On the calibration of the helicopter borne polarimetric radar René , 1996 .
[152] W. Paul Menzel,et al. Airborne Scanning Spectrometer for Remote Sensing of Cloud, Aerosol, Water Vapor, and Surface Properties , 1996 .
[153] T. Clarmann,et al. Remote sensing of trace gases with a balloon borne version of the Michelson interferometer for passive atmospheric sounding (MIPAS). , 1991 .
[154] C. Ruf,et al. Interferometric synthetic aperture microwave radiometry for the remote sensing of the Earth , 1988 .
[155] Gerd K. Hartmann,et al. Latitudinal survey of water vapor in the middle atmosphere using an airborne millimeter wave sensor , 1988 .
[156] Søren Nørvang Madsen,et al. Topographic mapping using radar interferometry: processing techniques , 1993, IEEE Trans. Geosci. Remote. Sens..
[157] Robert Meneghini,et al. Airborne Radar And Radiometer Experiment For Quantitative Remote Measurements Of Rain , 1989, 12th Canadian Symposium on Remote Sensing Geoscience and Remote Sensing Symposium,.
[158] M. King,et al. Determination of the optical thickness and effective particle radius of clouds from reflected solar , 1990 .
[159] J. M. Anderson,et al. A spatially variable light-frequency-selective component-based, airborne pushbroom imaging spectrometer for the water environment , 1993 .
[160] J. B. Mead,et al. A 95 GHz airborne radar for high resolution polarimetric cloud measurements , 1994, Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium.
[161] James D. Spinhirne,et al. Cirrus Structure and Radiative Parameters from Airborne Lidar and Spectral Radiometer Observations: The 28 October 1986 FIRE Study , 1990 .
[162] Thomas Cudahy,et al. Airborne CO2 Laser Remote Sensing System , 1994 .
[163] H. Fischer,et al. Remote Sensing of Atmospheric Trace Constituents Using Mid-IR Fourier Transform Spectrometry , 1992, Optical Remote Sensing of the Atmosphere.
[164] W. Renger,et al. Detection of Cloud-Top Height from Backscattered Radiances within the Oxygen A Band. Part 2: Measurements , 1991 .
[165] J. Smith,et al. Multichannel scanning radiometer for remote sensing cloud physical parameters , 1981 .
[166] J. D. Spinhirne,et al. The Structure and Phase of Cloud Tops as Observed by Polarization Lidar , 1983 .