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  • 1
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    Dosimetry of heavy ions by use of CCD detectors (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The design and the atomic composition of Charge Coupled Devices (CCD's) make them unique for investigations of single energetic particle events. As detector system for ionizing particles they detect single particles with local resolution and near real time particle tracking. In combination with its properties as optical sensor, particle transversals of single particles are to be correlated to any objects attached to the light sensitive surface of the sensor by simple imaging of their shadow and subsequent image analysis of both, optical image and particle effects, observed in affected pixels. With biological objects it is possible for the first time to investigate effects of single heavy ions in tissue or extinguished organs of metabolizing (i.e. moving) systems with a local resolution better than 15 microns. Calibration data for particle detection in CCD's are presented for low energetic protons and heavy ions.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: NASA. Ames Research Center, Minutes of the 12th Joint NASA(DARA-DLR Life Sciences Program Working Group Meeting; p 5-10
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Evaluation of the Radiometric Integrity of LANDSAT 4 Thematic Mapper Band 6 Data (1985)
    In:  CASI
    Details
    Publication Date: 2014-09-18
    Description: Probably the most generally accepted method for processing radiometric data from space is to correct the observed radiance or apparent temperature to a surface radiance or temperature value using atmospheric propagation models. As part of NASA's Heat Capacity Mapping Mission (HCMM) experiment the atmospheric propagation models were used in reverse in an attempt to evaluate the post launch radiometric response of the radiometer. Techniques successfully used to radiometrically calibrate the HCMM sensor were extended. The HCMM experiment is described and used as a base for the evaluation of the TM band 6 (infrared) sensor.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: LANDSAT-4 Sci. Characterization Early Results, Vol. 3, Pt. 2; p 221-231
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Data use investigations for applications Explorer Mission A (Heat Capacity Mapping Mission): HCMM's role in studies of the urban heat island, Great Lakes thermal phenomena and radiometric calibration of satellite data (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The utility of data from NASA'a heat capacity mapping mission satellite for studies of the urban heat island, thermal phenomena in large lakes and radiometric calibration of satellite sensors was assessed. The data were found to be of significant value in all cases. Using HCMM data, the existence and microstructure of the heat island can be observed and associated with land cover within the urban complex. The formation and development of the thermal bar in the Great Lakes can be observed and quantitatively mapped using HCMM data. In addition, the thermal patterns observed can be associated with water quality variations observed both from other remote sensing platforms and in situ. The imaging radiometer on-board the HCMM satellite is shown to be calibratible to within about 1.1 C of actual surface temperatures. These findings, as well as the analytical procedures used in studying the HCMM data, are included.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E81-10159 , NASA-CR-164271 , CALSPAN-6175-M-1
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    NASA TECHNICAL REPORTS
  • 4
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    S190 interpretation techniques development and application to New York State water resources (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. The program has demonstrated that Skylab imagery can be utilized to regularly monitor eutrophication indices of lakes, such as chlorophyll concentration and photic zone depth. The relationship between the blue to green reflectance ratio and chlorophyll concentration was shown, along with changes in lake properties caused by chlorophyll, lignin, and humic acid using reflectance ratios and changes. A data processing technique was developed for detecting atmospheric fluctuations occurring over a large lake.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E76-10081 , NASA-CR-144499 , YB-5298-M-2
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  • 5
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    Comparison of modelled and empirical atmospheric propagation data (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The radiometric integrity of TM thermal infrared channel data was evaluated and monitored to develop improved radiometric preprocessing calibration techniques for removal of atmospheric effects. Modelled atmospheric transmittance and path radiance were compared with empirical values derived from aircraft underflight data. Aircraft thermal infrared imagery and calibration data were available on two dates as were corresponding atmospheric radiosonde data. The radiosonde data were used as input to the LOWTRAN 5A code which was modified to output atmospheric path radiance in addition to transmittance. The aircraft data were calibrated and used to generate analogous measurements. These data indicate that there is a tendancy for the LOWTRAN model to underestimate atmospheric path radiance and transmittance as compared to empirical data. A plot of transmittance versus altitude for both LOWTRAN and empirical data is presented.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E83-10398 , NASA-CR-172940 , NAS 1.26:172940 , QR-3 , SPIE 27th Ann. Intern. Tech. Symp.; Jan 01, 1983; San Diego, CA; United States
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  • 6
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    Atmospheric corrections for satellite water quality studies (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Variations in the relative value of the blue and green reflectances of a lake can be correlated with important optical and biological parameters measured from surface vessels. Measurement of the relative reflectance values from color film imagery requires removal of atmospheric effects. Data processing is particularly crucial because: (1) lakes are the darkest objects in a scene; (2) minor reflectance changes can correspond to important physical changes; (3) lake systems extend over broad areas in which atmospheric conditions may fluctuate; (4) seasonal changes are of importance; and, (5) effects of weather are important, precluding flights under only ideal weather conditions. Data processing can be accomplished through microdensitometry of scene shadow areas. Measurements of reflectance ratios can be made to an accuracy of plus or minus 12%, sufficient to permit monitoring of important eutrophication indices.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Scanners and imagery systems for earth observation; Seminar; Aug 19, 1974 - Aug 20, 1974; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
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