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检索条件"任意字段=Recent Advances in Sensors, Radiometric Calibration, and Processing of Remotely Sensed Data 1993"

共 35 条记录，以下是11-20 订阅

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CHARACTERIZATION OF DESERT AREAS WITH METEOSAT-4 data FOR THE calibration OF OPTICAL SATELLITE sensors

CHARACTERIZATION OF DESERT AREAS WITH METEOSAT-4 DATA FOR TH...

引用

Conference on recent advances in sensors, radiometric calibration, and processing of remotely sensed data

作者： COSNEFROY, H BRIOTTET, X LEROY, M DERO CERTONERAF-31055 TOULOUSEFRANCE

ISBN: (纸本)0819411744

Desert areas are good candidates for the assessment of multitemporal, multiband or multiangular calibration of optical satellite sensors. This paper describes a selection procedure of desert zones in North Africa and Saudi Arabia, of size 100 X 100 km, using a criterion of spatial uniformity in a series of METEOSAT-4 visible data. Twenty such zones are selected with a spatial uniformity better than 3% in a multitemporal series of cloud free images. The temporal stability of the spatially averaged reflectance of each selected zone is investigated at seasonal and hourly time scales with same series of images. It is found that the temporal variations, of typical peak-to-peak amplitude 8 - 15% in relative value, are mostly controlled by directional effects, with residual rms variations, not accounted for by directional effects, of the order of 1 to 2 % in relative value.

关键词： Reflectivity Clouds calibration sensors Satellites Optical calibration Sun data modeling Image resolution CCD image sensors

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radiometric MODELS OF ROUGH WATER-SURFACE FOR REAL-TIME MEASUREMENTS OF IR AND MILLIMETER WAVES

RADIOMETRIC MODELS OF ROUGH WATER-SURFACE FOR REAL-TIME MEAS...

引用

Conference on recent advances in sensors, radiometric calibration, and processing of remotely sensed data

作者： PIROGOV, Y GLADUN, V ENGALICHEVA, A MELNIKOV, S MOSCOW MV LOMONOSOV STATE UNIV FAC PHYSMOSCOW 119899RUSSIA

ISBN: (纸本)0819411744

Effective radiometric models in IR and millimeter waves ranges were developed for remote measurements of a sea surface in the real time. Real time processing of IR-radiometer signals was accelerated by decreasing of integration intervals in the space of angles of sight. A 3D model was developed in the millimeter wave range for a 2-scale rough sea surface. The suggested models yield the wind velocity (IR-model), wave spectrum and direction of the sea surface waves (millimeter-range model).

关键词： 3D modeling Extremely high frequency Diffraction Dielectric polarization Electromagnetic radiation Electromagnetism Signal processing Scanning probe microscopy Scattering Reflection

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INFRARED RADIANCE COMPARATOR

INFRARED RADIANCE COMPARATOR

引用

Conference on recent advances in sensors, radiometric calibration, and processing of remotely sensed data

作者： JANEST, A NEGRO, G FANJEAUX, M STE BERTIN & CIE F-13791 AIX EN PROVENCE 3FRANCE

ISBN: (纸本)0819411744

The Infrared Radiance Comparator was designed for the French setting of the International Scale Temperatures (IST 90). This apparatus is devoted to high accuracy calibration of radiative sources (black bodies, tungsten ribbon lamps) for the 250 K - 2500 K temperature scale. The basic concept used for this instrument minimizes the systematic errors well known in this metrology field by measuring the critical parameters (effective wavelength of internal interference filter, linearity defects of the analog signal of the detector, polarization ratio of measured radiatives sources). Some secondary devices are used for the in-situ measurements of these critical parameters.

关键词： sensors Mirrors Interference filters Infrared radiation calibration Signal detection Black bodies Metrology Optical filters Polarization

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calibration OF THEMATIC MAPPER BAND-6 IN THE THERMAL INFRARED

CALIBRATION OF THEMATIC MAPPER BAND-6 IN THE THERMAL INFRARE...

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Conference on recent advances in sensors, radiometric calibration, and processing of remotely sensed data

作者： PALMER, JM UNIV ARIZONA CTR OPT SCIREMOTE SENSING GRPTUCSONAZ 85721

ISBN: (纸本)0819411744

A vicarious calibration of band 6 of the Thematic Mapper sensor carried on Landsat-5 was conducted at White Sands Missile Range (NM) in August 1992. The method utilized was based on direct measurements of surface temperature and local meteorological factors and an indirect measurement of surface emittance. Atmospheric path transmission and radiances were characterized using LOWTRAN7, and surface reflectance was derived from surface emittance. The difference between the preflight calibration and this calibration was less than 5%.

关键词： calibration Atmospheric modeling Temperature metrology sensors Infrared radiation Reflectivity Thermography Atmospheric propagation Earth observing sensors Landsat

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WIDE-FIELD PLANETARY CAMERA-2 calibration SYSTEM CONFIGURATION AND PERFORMANCE CHARACTERIZATION

WIDE-FIELD PLANETARY CAMERA-2 CALIBRATION SYSTEM CONFIGURATI...

引用

Conference on recent advances in sensors, radiometric calibration, and processing of remotely sensed data

作者： MAJORANA, LN SMITH, ST JET PROP LAB PASADENACA 91109

ISBN: (纸本)0819411744

The next generation Wide Field Planetary Camera will include a calibration system which will enable in situ relative radiometric field calibration of the CCD detectors from the VUV to the near IR. The system features various incandescent and UV light sources which are configured to produce flat field. Preliminary tests and characterization of the system show performance to be quite good both spatially and spectrally. A description of the system, test procedures, and results will be described.

关键词： calibration Diffusers Optical filters Lamps Charge-coupled devices Imaging systems Cameras Ultraviolet radiation CCD cameras Relays

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CONSISTENCY OF THE EARTHS OUTGOING RADIATION BASED ON remotely-sensed ACTIVE CAVITY radiometric data FROM THE EARTH RADIATION BUDGET SATELLITE

CONSISTENCY OF THE EARTHS OUTGOING RADIATION BASED ON REMOTE...

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Conference on recent advances in sensors, radiometric calibration, and processing of remotely sensed data

作者： PADEN, J PANDEY, DK LEE, RB BOLDEN, W WILSON, RS SCI APPLICAT INT CORP HAMPTONVA 23666

ISBN: (纸本)0819411744

As a part of the Earth Radiation Budget Experiment (ERBE), the Earth Radiation Budget Satellite (ERBS) has continuously acquired active-cavity radiometric measurements of the Earth's outgoing radiative flux since October 1984. We have analyzed the daily average of daytime and nighttime total and shortwave flux measurements from the ERBS, at satellite altitude, for the period from January 1985 through December 1991. We found the annual cycle of total and shortwave flux measurements to be highly repeatable. We averaged the ERBS data for the years 1985 through 1989, and used these as a mean for comparison of 1990 and 1991 data. We observed (in daytime) some differences in both the total and shortwave flux regions. Similar trends were not apparent in the derived daytime longwave data (i.e., total- sw). There is evidence of generally increasing outgoing flux (and hence a warming trend) over the years 1985 through 1991.

关键词： Satellites Shortwaves Climate change Scanners Sun Adaptive optics calibration data corrections data acquisition data centers

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BACKGROUND CLUTTER MODELS FOR SCENE SIMULATION

BACKGROUND CLUTTER MODELS FOR SCENE SIMULATION

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Conference on recent advances in sensors, radiometric calibration, and processing of remotely sensed data

作者： CATHCART, JM FAUST, NL SHEFFER, AD RODRIGUEZ, LJ GEORGIA INST TECHNOL RES INSTELECTROOPT & PHYS SCI LABATLANTAGA 30332

ISBN: (纸本)0819411744

Geographic background models constitute an important component in scene simulations as they provide one component of clutter observed through IR sensors. Accurate modeling of the spatially-varying features and signatures of the background presents a significant challenge to the developer of a scene simulation; especially for tactical applications. The approach employed within the Georgia Tech Research Institute is outlined in this paper. Emphasis is placed on the methodology for creating the spatial structure of the background, the underlying signature prediction model, and the relationship between the geographic features and the signature model.

关键词： databases data modeling 3D modeling Electro optical modeling Scene simulation Image processing Infrared signatures Photography Soil science Thermal modeling

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VARIOUS FLIR SENSOR EFFECTS APPLIED TO SYNTHETIC THERMAL IMAGERY

VARIOUS FLIR SENSOR EFFECTS APPLIED TO SYNTHETIC THERMAL IMA...

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Conference on recent advances in sensors, radiometric calibration, and processing of remotely sensed data

作者： KORNFELD, G PENN, J USA RES LABFT BELVOIRVA 22060

ISBN: (纸本)0819411744

Digital simulations produced by the CREATION scene generation program will be used to demonstrate effects of state of the art and proposed future sensor characteristics on the output images of IR imaging systems. Necessary conditions for the validity of the digital simulations will be illustrated in the first part of the presentation. Tradeoffs between specific FLIRs will be discussed and some suggestions for preprocessing steps of future focal planes follow. Important tradeoffs between sensor characteristics are stressed. The fidelity of CREATION does not only apply to readily available vehicle geometry; the rigorously 3D background features of the latest version of CREATION have higher resolution than the state of the art thermal signatures of targets; these additional details may be important for objective comparisons of sensor degradations.

关键词： sensors Forward looking infrared Infrared sensors Diffraction Modulation transfer functions Thermography Convolution Objectives Infrared technology Mirrors

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VISUAL SIMULATION OF DIGITAL ATMOSPHERIC data

VISUAL SIMULATION OF DIGITAL ATMOSPHERIC DATA

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Conference on recent advances in sensors, radiometric calibration, and processing of remotely sensed data

作者： MONTAG, BC SW RES INST SAN ANTONIOTX 78238

ISBN: (纸本)0819411744

Sources of remotely sensed atmospheric data have expanded rapidly within the last several years, including ground-based Doppler weather radars and several satellite-based, earth- observing systems that sense and record large-scale weather conditions. Although these systems are capable of producing voluminous amounts of data, tools for visualizing, analyzing, and applying the data for operational uses requiring 4D display have not kept up. This paper presents a discussion of a software system known as WEST (Weather Environment Simulation Technology). WEST was developed through internal funding at Southwest Research Institute, for the visualization and simulator integration of very large atmospheric data sets containing fine-grained weather features. The approach implemented within WEST allows the user to visually observe, 'fly through', and interact with recorded atmospheric data at real-time speeds using commercial off-the-shelf hardware. This new capability is designed to benefit such diverse applications as flight training, weather analysis, systems design, and mission planning.

关键词： Visualization Computer simulations data modeling Atmospheric modeling databases Visual process modeling Clouds Image processing Visual analytics Atmospheric sensing

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USE OF LOWTRAN DERIVED ATMOSPHERIC PARAMETERS IN SYNTHETIC IMAGE GENERATION MODELS

USE OF LOWTRAN DERIVED ATMOSPHERIC PARAMETERS IN SYNTHETIC I...

引用

Conference on recent advances in sensors, radiometric calibration, and processing of remotely sensed data

作者： SALVAGGIO, C SIRIANNI, JD SCHOTT, JR ROCHESTER INST TECHNOL CTR IMAGING SCIDIGITAL IMAGING & REMOTE SENSING LABROCHESTERNY 14623

ISBN: (纸本)0819411744

The Digital Imaging and Remote Sensing laboratory's Image Generation model combines computer aided design, ray tracing techniques, radiometric principles, and thermodynamic models to create synthetic imagery. The model emphasizes rigorous radiometric solutions that account for spectral reflectance effects, angular emissivities, atmospheric transmission and upwelled and downwelled sky radiance. This paper describes enhancements to the radiometric portion of the code that permits inclusion of variations with azimuth of downwelling sky radiance, solution of the radiometric propagation models using specific radiosonde data including adjustments for the time of day, and the incorporation of background effects from objects adjacent to the target. Simulated scenes are presented that show how these enhancements produce imagery that more closely match observed phenomena. In particular, the importance of properly modeled sky radiance is shown both for low altitude oblique imagery where the sky is directly observed and for near nadir imagery where reflected sky radiance is important.

关键词： Atmospheric modeling sensors data modeling Ray tracing Reflectivity Atmospheric propagation Atmospheric sensing Solid modeling Digital imaging databases

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