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  • 1
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    A comparison of 9-inch, 70mm, and 35mm cameras (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Successful aerial photography depends on aerial cameras that provide acceptable photographs within the cost restrictions of the job. For topographic mapping where ultimate accuracy is required, only large-format mapping cameras will suffice. For mapping environmental patterns of vegetation, soils, or water pollution, 9-inch cameras often exceed accuracy and cost requirements, and small formats may be an overall better choice. In choosing the best camera for environmental mapping, relative capabilities and costs must be understood. This study compares resolution, photo interpretation potential, metric accuracy, and cost of 9-inch, 70 mm, and 35 mm cameras for obtaining simultaneous color and color-infrared photography for environmental mapping purposes.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Photogrammetric Engineering and Remote Sensing; 41; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Elemental Geochemistry of Sedimentary Rocks at Yellowknife Bay, Gale Crater, Mars (2014)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Sedimentary rocks examined by the Curiosity rover at Yellowknife Bay, Mars, were derived from sources that evolved from an approximately average martian crustal composition to one influenced by alkaline basalts. No evidence of chemical weathering is preserved, indicating arid, possibly cold, paleoclimates and rapid erosion and deposition. The absence of predicted geochemical variations indicates that magnetite and phyllosilicates formed by diagenesis under low-temperature, circumneutral pH, rock-dominated aqueous conditions. Analyses of diagenetic features (including concretions, raised ridges, and fractures) at high spatial resolution indicate that they are composed of iron- and halogen-rich components, magnesium-iron-chlorine-rich components, and hydrated calcium sulfates, respectively. Composition of a cross-cutting dike-like feature is consistent with sedimentary intrusion. The geochemistry of these sedimentary rocks provides further evidence for diverse depositional and diagenetic sedimentary environments during the early history of Mars.
    Keywords: Exobiology
    Type: GSFC-E-DAA-TN21724 , Science (ISSN 0036-8075) (e-ISSN 1095-9203); 343; 6169; 1244734
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Calcium Sulfate Characterized by Chemcam/Curiousity at Gale Crater, Mars (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Onboard the Mars Science Laboratory (MSL) Curiosity rover, the ChemCam instrument consists of : (1) a Laser-Induced Breakdown Spectrometer (LIBS) for elemental analysis of the targets and (2) a Remote Micro Imager (RMI), for the imaging context of laser analysis. Within the Gale crater, Curiosity traveled from Bradbury Landing through the Rocknest region and into Yellowknife Bay (YB). In the latter, abundant light-toned fracture-fill material occur. ChemCam analysis demonstrates that those fracture fills consist of calcium sulfates.[
    Keywords: Lunar and Planetary Science and Exploration; Geophysics
    Type: JSC-CN-30424 , Lunar and Planetary Science Conrference; Mar 17, 2014 - Mar 21, 2014; The Woodlands, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Accuracy, resolution, and cost comparisons between small format and mapping cameras for environmental mapping (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Successful aerial photography depends on aerial cameras providing acceptable photographs within cost restrictions of the job. For topographic mapping where ultimate accuracy is required only large format mapping cameras will suffice. For mapping environmental patterns of vegetation, soils, or water pollution, 9-inch cameras often exceed accuracy and cost requirements, and small formats may be better. In choosing the best camera for environmental mapping, relative capabilities and costs must be understood. This study compares resolution, photo interpretation potential, metric accuracy, and cost of 9-inch, 70mm, and 35mm cameras for obtaining simultaneous color and color infrared photography for environmental mapping purposes.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: American Society of Photogrammetry, Annual Meeting; Mar 09, 1975 - Mar 14, 1975; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
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