Jul 21, 2011 ... MISR has challenging radiometric specifications of 3% absolute, and 1% band and camera-relative calibration. The radiometric calibration is ...
NASA Website
The TM multispectral scanner system was calibrated in an absolute manner before launch. To determine
NASA Technical Reports Server (NTRS)
Research aimed at improving the inflight absolute radiometric calibration of advanced land observing
the verification of the antenna beam alignment of all frequencies and polarizations,. the determination of the absolute calibration factor from the image ...
In order to determine the extent of agreement among laboratory radiometric .... visible region of the spectrum and greater than 10% in and mound the water ...
Using selected instrumented areas at White Sands Missile Range, New Mexico as reference, radiometric
In order to determine temporal changes of the absolute radiometric calibration of the entire TM system in flight spectroradiometric measurements of the ground and the atmosphere were made simultaneously with TM image collections over the White Sands, New ...
National Technical Information Service (NTIS)
... with a calibration traced to the National Institute of Standards and Technology ... Optronics Laboratories, Inc. The irradiance lamp is held a known ...
This report describes the present method of establishing traceability of absolute cavity radiometers to the World Radiometric Reference (WRR) through the process employed in the International Pyrheliometer Comparisons (IPC). This method derives the WRR re...
The well-maintained UVCS/SOHO radiometric calibration is used to determine the variations in the ultraviolet intensities in polar coronal holes between the Solar Cycle 22/23 and Cycle 23/24 minima. The radiometric calibration has been carefully monitored and updated during the mission by observing an ensemble of B ...
NASA Astrophysics Data System (ADS)
a panchromatic band with 15m spatial resolution; " on-board, full aperture, 5% absolute radiometric calibration; " a thermal IR channel with 60m spatial ...
Electrically calibrated cavity radiometers for solar radiometry were developed. New experimental methods have been devised for the independent characterization of the radiometric performance. This method allows one to determine the absolute accuracy of an...
Comparisons and error analysis show that the specified absolute radiometric accuracies are reached or nearly reached in MODIS bands 21, 29, and 31-33 and ...
... Title : Infrared Celestial Backgrounds Studies, Volume 2. A Radiometric All-Sky Network of Absolutely Calibrated Stellar Spectra. ...
DTIC Science & Technology
Strain Gage Measurement System to Determine Cryogenic Propellant Tank Level ... The two groups determined the absolute radiometric calibration coefficients ...
The Viking lander cameras feature an array of 12 silicon photodiodes for electronic focus selection and multispectral imaging. Comparisons of absolute radiometric calibrations of the four cameras selected for the mission to Mars with performance predictio...
MWR radiometric calibration. Deliver to CONAE independent analysis of TV radiometric calibration. Deliver to CONAE post-launch radiometric calibration ...
The primary UV radiometric calibration standards of the Atomic and Plasma Radiation Division of the NBS are the hydrogen arc and the blackbody line arc. The secondary standards are the argon mini- and maxiarcs, and the deuterium arc lamp. Calibration methods involving both spectral radiance and irradiance, as well as the evaluation of ...
Radiometric measurements performed by the PV Solar Radiometric Measurements Task support NREL's centers for Measurements and Characterization, Performance Engineering and Reliability, and Renewable Energy Resources. The task provides characterization, measurements, testing, designs, and analysis of radiometric instrumentation and data ...
A measurement-based radiance estimation approach for vicarious radiometric calibration of spaceborne
The methodology developed to monitor the radiometric calibration of NOAA AVHRR data and to normalize
A description is given of the experimental methods used in the calibration procedure, taking into account the source of radiant energy, the monochromator, the absolute standard detector, and the transfer standards. The experimental apparatus is discussed. A graph showing the effect of beam motion on the detected signal is presented and a block diagram of ...
Physics-based exploitation of image data from Earth observing sensors requires knowledge of the accuracy, stability and repeatability of a sensor's radiometric response within its in-flight environment. Vicarious radiometric calibration techniques, using terrestrial targets, provide an effective approach to obtaining this knowledge by ...
-18 where Thome presented the University of Arizona's results on the radiometric calibration of ASTER of absolute radiometric calibration using NIST primary standards of spectral irradiance, a 40-inch spherical. Mavko, and Thome participating. The dates of primary interest to this project were ...
E-print Network
Further results from field experiments to radiometrically correct a multifrequency airborne SAR system are presented. Three frequencies of SAR data (X-, C-, and L-band) at VV polarization were collected over a target array of calibrated trihedral corner reflectors over a 2-week period in summer 1988. For all three frequencies, data collected on one date ...
Accurate solar extreme ultraviolet (EUV) spectral irradiance data are needed for research in solar, ionospheric/thermospheric, and planetary physics, as well as for space weather forecasts and spacecraft operations and tracking. Because of instrument perf...
Multispectral area CCD camera based on liquid crystal tunable filter (LCTF) is a new spectral imaging system, which could record image of one wavelength on the area CCD by utilizing electrically controlled birefringence of liquid-crystal and interference principle of polarized light. Because of the special working principle of LCTF and frame transfer area CCD, the existing ...
PubMed
... Abstract : The Absolute Radiometric Code (ARC) is a collection of Matlab functions tied together under a Matlab Graphical User Interface (GUI). ...
Feb 2, 2005 ... Abstract This paper describes radiometric performance and ...... This paper has described the radiometric performance, and ...
The Lunar Calibration program at the U.S. Geological Survey (USGS) in Flagstaff, AZ, provides the radiometric reference of the Moon as a source for calibration at reflected-solar wavelengths. To develop this capability, thousands of multispectral images of the Moon were acquired by the Robotic Lunar Observatory (ROLO) telescope imaging ...
We analyze the technique of using radiometers to measure the precipitable water vapor (PWV) content of the atmosphere in order to correct interferometric data for phase noise due PWV fluctuations in the troposphere. We present an idealized model of phase fluctuations due to PWV variations in the troposphere based on the Taylor hypothesis, and we summarize the radiometry equations. We then consider ...
Radiometric calibration of satellite-acquired data is essential for quantitative scientific studies,
Figure 11: Radiometric calibration coefficients for Band 2. ...... and vacuum tank window to redirect the beam into the monochromator. ...
This report describes the design and initial noise floor measurements of a radiometric calorimeter designed to measure therapeutic medical radioactive sources. The instrument demonstrates a noise floor of approximately 2 nW. This low noise floor is achieved by using high temperature superconducting (HTS) transition edge sensor (TES) thermometers in a temperature-control ...
An increasing number of remote sensing investigations require radiometrically calibrated imagery from NOAA Advanced Very High Resolution Radiation (AVHRR) sensors. Although a prelaunch calibration is done for these sensors, there is no capability for monitoring any changes in the in-flight absolute ...
instruments measure surface radiance, which requires that they are calibrated and validated in flight. In-flight validation is essential to independently verify that instrument calibration correctly compensates for any changes in instrument response over time. In order to meet this requirement, an au- tomated validation
The Visible/Infrared Imaging Radiometer Suite (VIIRS) collects radiometric and imagery data in 22 spectral bands within the visible and infrared spectrum ranging from 0.4 to 12.5 ?m. This paper describes the radiometric uncertainty requirements for the 7 VIIRS thermal emissive bands and the calibration methodology employed to meet ...
Ball Aerospace and Technologies Corporation in Boulder, Colorado, has developed a heliostat facility that will be used to determine the preflight radiometric calibration of Earth-observing sensors that operate in the solar-reflective regime. While automatically tracking the Sun, the heliostat directs the solar beam inside a thermal vacuum chamber, where ...
The goal of this research program is development of a method for obtaining daily, radiometrically accurate, solar spectral irradiance data at extreme-ultraviolet (EUV) wavelengths. In-orbit radiometric instrumentation recalibration is a fundamental requirement for such measurements. The authors proposed to investigate, design, and test smaller and less ...
Energy Citations Database
The Solar EUV Rocket Telescope and Spectrograph (SERTS) obtains imaged high-resolution spectra of individual solar features, providing information about the Sun's corona and upper transition region. We have recently carried out a complete end-to-end calibration of the instrument to determine its absolute radiometric response over the ...
The Remote Sensing Group at the University of Arizona has developed multispectral ground-viewing radiometers that use light-emitting diodes as detectors. This work describes the optical design, electrical design, and laboratory calibration of a three-channel radiometer that operates in the visible and near-infrared region of the spectrum. The optical and electrical design of ...
Design, radiometric and thermal performance, and operation of a large diameter (78 cm) liquid-helium-cooled blackbody absolute reference cold load (CL) for the calibration of microwave radiometers is described. CL provides an absolute calibration near the liquid-helium (LHe) boiling point, with ...
... Accession Number : AD0700159. Title : CALIBRATION OF RADIOMETERS IN ABSOLUTE RADIATION UNITS,. Corporate ...
... Accession Number : AD0667289. Title : ABSOLUTE CALIBRATION OF REFERENCE HYDROPHONES IN THE AUDIO FREQUENCY RANGE,. ...
A number of factors affect the accuracy of aerosol retrievals from satellite imaging radiometers, including algorithm assumptions, the quality of the associated cloud masks, the prescribed aerosol optical and microphysical models, and calibration uncertainties. In this paper, we highlight a concerted effort by the Terra Multi-angle Imaging SpectroRadiometer (MISR) team to ...
This report describes the present method of establishing traceability of absolute cavity radiometers to the World Radiometric Reference (WRR) through the process employed in the International Pyrheliometer Comparisons (IPC). This method derives the WRR reduction factor for each of the participating cavity radiometers. An alternative method is proposed, ...
DOE Information Bridge
The Extreme-Ultraviolet Normal-Incidence Spectrometer (EUNIS) is a sounding-rocket payload that obtains imaged high-resolution spectra of individual solar features, providing information about the Sun's corona and upper transition region. Shortly after its successful initial flight last year, a complete end-to-end calibration was carried out to determine the instrument's ...
The creation of multi-decadal data sets for climate research requires better than 100 mK absolute calibration accuracy for the full range of spectral temperatures encountered under global conditions. Validation that this accuracy is achieved by the operational hyperspectral sounders from polar orbit is facilitated by comparing data from two instruments. ...
Santa Barbara Infrared, Inc (SBIR) has developed a dual-band infrared spectroradiometer for highly accurate radiometric calibration of electro-optical (EO) test stations, light sources, and optical surfaces. The "RAD-9000" design covers the 3-5 mm and 8-12 mm spectral bands, provides thermal sensitivity of better than 40 mK, supports object temperatures ...
We have begun construction of a visible/infrared radiometric calibration station that will allow for absolute calibration of optical and IR remote sensing instruments with clear apertures less than 16 inches in diameter in a vacuum environment. The calibration station broadband sources will be ...
... At AEDC, establishing source radiometric output was then accomplished by transferring calibrations from a source with a previous NBS calibration. ...
This paper provides an update on the RAD9000 MWIR/LWIR spectral radiometer: a high-performance instrument supporting extremely accurate absolute and relative radiometric calibration of EO test systems. The system features an all-reflective optical system, internal and external thermal reference sources, a visible camera-based ...
Magnetic dipole transitions within the ground-state configuration of Si-like Ni, Cu, Zn, Ge, and Se have been observed. Seven lines have been newly identified. Observations are made on the Texas Experimental Tokamak by laser-ablation injection of each of these elements into the plasma. The radiative-branching-ratio technique, utilizing lines originating from the same upper level, 3/ital p//sup 2/ ...
This paper presents a Fourier transform infrared (FT-IR) spectrometer calibration procedure based on an unusual source made from a spectrally selective surface. An alternative solution to the usual calibrators has been developed to cope with the tight mass budget of an instrument devoted to Mars surface exploration. The designed system has proved ...
radiometric sphere sources for radiance, using a spectroradiometer and a ... The calculation of the spectral radiance of a large-area sphere source is a ...
Carol Bruegge of JPL described the calibration and radiometric performance of ... and analysis technique for establishing dynamic radiometric thresholds, ...
We start from our six absolutely calibrated continuous stellar spectra from 1.2 to 35 ?m for K0, K1.5, K3, K5, and M0 giants. These were constructed as far as possible from actual observed spectral fragments taken from the ground, the Kuiper Airborne Observatory, and the IRAS Low Resolution Spectrometer, and all have a common ...
The Landsat archive provides more than 35 years of uninterrupted multispectral remotely sensed data of Earth observations. Since 1972, Landsat missions have carried different types of sensors, from the Return Beam Vidicon (RBV) camera to the Enhanced Thematic Mapper Plus (ETM+). However, the Thematic Mapper (TM) sensors on Landsat 4 (L4) and Landsat 5 (L5), launched in 1982 and 1984 respectively, ...
Los Alamos National Laboratory is currently constructing a calibration laboratory to support the radiometric calibration of remote earth sensing instrumentation. This laboratory will consist of a calibration station contained within a vacuum chamber whose output interface plane will provide a ...
This paper evaluates the absolute accuracy and stability of the radiometric calibration of the Atmospheric Infrared Sounder (AIRS) by analyzing the difference between the brightness temperatures measured at 2616 cm-1 and those calculated at the top of the atmosphere (TOA), using the Real-Time Global Sea Surface Temperature (RTGSST) for ...
The intent was to develop and test analytical techniques that will enhance the scientific and technical exploitation of digital multispectral data. The thrust involved radiometric calibration efforts aimed at determining the bias and validity in absolute temperature determinations using TM band 6 data. Other objectives included: ...
The ultimate remote sensing benefits of the high resolution Infrared radiance spectrometers will be realized with their geostationary satellite implementation in the form of imaging spectrometers. This will enable dynamic features of the atmosphere's thermodynamic fields and pollutant and greenhouse gas constituents to be observed for revolutionary improvements in weather forecasts and more ...
Airborne and spaceborne Synthetic Aperture Radar (SAR) backscatter data have the potential to retrieve information on forest structure, above-ground biomass, and moisture content. However, SAR backscatter data contain both geometric and radiometric distortions due to underlying topography and the radar viewing geometry. These distortions can significantly affect the estimation ...
to obtain absolute calibrations (C.L. Brest, this issue; Brest and Rossow, 1991). Cloud climatology Figure 3 the detailed effects of clouds in today's climate. References Brest, C.L. and Rossow, W.B., 1991. Radiometric
This book contains papers presented at a conference on Earth Remote Sensing using the Landset Thematic Mapper and SPOT Sensor Systems. Topics covered include: Evaluation of Landsat Thematic Mapper: imagery for geological exploration; Comparative analysis of different sensor data (Landsat-TM and MOMS) for earth observation and impact on future sensor development; and Absolute ...
An unbaked calibration system is described that permits absolute calibration with a piston manometer
We describe an absolute, spectrally tunable, detector-based broad-band radiometric calibration source whose uncertainties in spectral radiance may approach those of reference detectors, on the order of 0.1 % (k=1). This uncertainty in the spectral radiance of the source is a factor of two lower than the current uncertainty in radiance ...
We describe a large (78-cm) diameter liquid-helium-cooled black-body absolute reference cold load for the calibration of microwave radiometers. The load provides an absolute calibration near the liquid helium (LHe) boiling point, accurate to better than 30 mK for wavelengths from 2.5 to 25 cm (12-1.2 GHz). The ...
Vacuum tank window transmission. Spectral response of ALI. " Obtain Response of Each Pixel for Each ... is the derived radiometric calibration coefficient ...
RC specifies that radiometric file R2D2.RC should be used. All other calibration files are located via the Radiometric Catalog. ALL calibration files are ...
AVIRIS Radiometric Laboratory Calibration, Inflight Validation, and a. Focused Sensitivity Analysis in. 1998. Robert 0. Green, Betina Pavri, Jessica Faust, ...
... Title : A New Approach for Radiometric Cross Calibration ... MODELS, EMISSIVITY, SURFACE PROPERTIES, EARTH(PLANET), IMAGES, SPECTRA ...
Los Alamos is developing a laboratory that will support state of the art calibration of moderate-aperture instrumentation (< 40 cm diameter) having high spatial and thermal resolution. Highly accurate calibration in the reflected solar and thermal infrared spectral regions are required for newly developed instrumentation. ...
The subjects investigated are related to modeling studies, atmospheric effects and radiometric calibration, marine and geological research, spectral signature studies, agricultural research, information extraction and processing, engineering and mapping considerations, and future prospects. Attention is given to a review of models and measurements of ...
The need to understand and monitor climate change has led to proposed radiometric accuracy requirements for space-based remote-sensing instruments that are very stringent. However, many of these requirements are unmet by the current fleet of earth orbiting instruments. A major problem is quantifying the changes that instruments undergo during the launch and throughout the ...
A flat plate calibrator is one instrument used in calibrating infrared (IR) thermometers, primarily in the 8 - 14 ?m band. One such family of flat plate calibrators is the 418X Precision IR Calibrator from Fluke Corporation Hart Scientific Division. This product is calibrated with a ...
The Multispectral Thermal Imager (MTI) was designed as an imaging radiometer with absolute calibration requirements established by Department of Energy (DOE) mission goals. Particular emphasis was given to water surface temperature retrieval using two mid wave and three long wave infrared spectral bands, the fundamental requirement was a surface ...
Radiometric calibration of commercial imaging satellite products is required to ensure that science and application communities can better understand their properties. Inaccurate radiometric calibrations can lead to erroneous decisions and invalid conclus...
metrically calibrating FILE. All filters were specified ... portant for indoor calibration of FILE with artificial illumination). ...
The AVIRIS sensor must be calibrated at the time it measures spectra from the ER-2 airborne platform
This data is processed to find the component parts of .... WSMR. Figure 3. Typical reflectance of sites used for vicarious calibration ...
The Steelcast coated aluminum cones which comprise the calibrator have a low ..... a rectangular grid of cones. Measurements were ...
The Beam Characterization System (BCS) used at the Central Receiver Test Facility digitizes the output signal from a standard 525-line video camera to obtain raw data for measurements of solar heliostat images. A rapid data rate and relative availability of off-the-shelf equipment favor the use of a video camera system, but the problem of an accurate absolute ...
... (Author). Descriptors : *INFRARED RADIATION, *BLACKBODY RADIATION, SOURCES, CALIBRATION, BOLOMETERS, INFRARED DETECTORS. ...
operations to coordinate the time of data collection of the spacecraft with the ground truth measurements. The result is a ...
The utility of a remote sensing system increases with its ability to retrieve surface temperature or
