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  • 1
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    Passive seismic experiment (1970)
    In:  CASI
    Details
    Publication Date: 2004-12-06
    Description: Apollo 12 passive seismometer design and signal interpretation
    Keywords: GEOPHYSICS
    Type: APOLLO 12- PRELIM. SCI. REPT. 1 JUN. 1970; P 39-53
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Interpretation of geographic patterns in simulated orbital television imagery of earth resources (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: In order to better determine the effects of the television imagery characteristics upon the interpretation of geographic patterns obtainable from orbital television sensors, and in order to better evaluate the influences of alternative sensor system parameters such as changes in orbital altitudes or scan line rates, a team of three professional interpreters independently mapped thematically the selected geographic phenomena that they could detect in orbital television imagery produced on a fourteen inch monitor and recorded photographically for analysis. Three thematic maps were compiled by each interpreter. The maps were: (1) transportation patterns; (2) other land use; and (3) physical regions. The results from the three interpreters are compared, agreements noted, and differences analyzed for cause such as disagreement on identification of phenomenon, visual acuity, differences in interpretation techniques, and differing professional backgrounds.
    Keywords: GEOPHYSICS
    Type: Simulating and Interpreting Aerial or Orbital TV Observations of Geographic Patterns; p 35-84
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    NASA TECHNICAL REPORTS
  • 3
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    A system for simulating aerial or orbital TV observations of geographic patterns (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A system which simulates observation of the earth surface by aerial or orbiting television devices has been developed. By projecting color slides of photographs taken by aircraft and orbiting sensors upon a rear screen system, and altering scale of projected image, screen position, or TV camera position, it is possible to simulate alternatives of altitude, or optical systems. By altering scan line patterns in COHU 3200 series camera from 525 to 945 scan lines, it is possible to study implications of scan line resolution upon the detection and analysis of geographic patterns observed by orbiting TV systems.
    Keywords: GEOPHYSICS
    Type: Simulating and Interpreting Aerial or Orbital TV Observations of Geographic Patterns; p 7-34
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Remote sensing of vigor loss in conifers due to dwarf mistletoe (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The initial operation of a multiband/multidate tower-tramway test site in northeastern Minnesota for the development of specifications for subsequent multiband aerial photography of more extensive study areas was completed. Multiband/multidate configurations suggested by the tower-tramway studies were and will be flown with local equipment over the Togo test site. This site was photographed by the NASA RB57F aircraft in August and September 1971. It appears that, of all the film/filter combinations attempted to date (including optical recombining of several spectral band images via photo enhancement techniques), Ektachrome infrared film with a Wratten 12 filter is the best for detecting dwarf mistletoe, and other tree diseases as well. Using this film/filter combination, infection centers are easily detectable even on the smallest photo scale (1:100,000) obtained on the Togo site.
    Keywords: GEOPHYSICS
    Type: NASA-CR-127682
    Format: application/pdf
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  • 5
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    Vigor loss in conifers due to dwarf mistletoe (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Practical remote sensing techniques were developed for detecting and evaluating vigor loss in forest conifers due to dwarf mistletoe. Eastern dwarf mistletoe (Arceuthobium pusillum) infection of black spruce (Picea mariana) was investigated. A tower-tramway system, 100 feet high, was erected over an infected stand in northeast Minnesota in June and multiband/multidate photography was initiated in July and is continuing. Four 70mm film-filter combinations were used in a multicamera unit: Plus-X/Wratten 58, Plus-X/Wratten 25A, Aero Infrared/Wratten 89B, and Ektachrome Infrared/Wratten 12. The stand of mistletoe-infected black spruce under the tramway was photographed three times per day (0900, 1200 and 1500 local sun time) at approximately 10 day intervals. An extensive test site, several square miles in area, was selected in north-central Minnesota for the purpose of testing photographic specifications developed on the tramway test site. One aerial photographic flight at a variety of altitudes was accomplished over the extensive test site in August. Data analyses are not available at this time.
    Keywords: GEOPHYSICS
    Type: NASA-CR-131582 , APR-1
    Format: application/pdf
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  • 6
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    An experimental study of thermally induced microfracturing and its relation to volcanic seismicity (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Thermoelastic seismic-energy release as source mechanism for volcanic earthquakes, describing thermal microfracture tests
    Keywords: GEOPHYSICS
    Type: ; 47 (
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Aerial Photography: Use in Detecting Simulated Insect Defoliation in Corn (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Artificial defoliation in corn was used to explore the usefulness of aerial photography in detecting crop insect infestations. Defoliation on the top of plants was easily detected, while that on the base was less so. Aero infrared film with Wratten 89B filter gave the best results, and morning flights at the scale of 1:15840 are recommended. Row direction, plant growth stage, and time elapse since defoliation were not important factors.
    Keywords: GEOPHYSICS
    Type: PAPER-8076 , A study of Minn. Forests and Lakes using Data from ERTS; p 71-76
    Format: text
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  • 8
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    Field measurement of penetrator seismic coupling in sediments and volcanic rocks (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Field experiments were conducted to determine experimentally how well a seismometer installed using a penetrator would be coupled to the ground. A dry lake bed and a lava bed were chosen as test sites to represent geological environments of two widely different material properties. At each site, two half-scale penetrators were fired into the ground, a three-component geophone assembly was mounted to the aft end of each penetrator, and dummy penetrators were fired at various distances to generate seismic signals. The recorded signals were digitized, and cross-spectral analyses were performed to compare the observed signals in terms of power spectral density ratio, coherence and phase difference. The analyses indicate that seismometers deployed by penetrators will be as well coupled to the ground as are seismometers installed by conventional methods for the frequency range of interest in earthquake seismology, although some minor differences were observed at frequencies near the upper limit of the frequency band.
    Keywords: GEOPHYSICS
    Type: NASA-CR-158081 , CONTRIB-316
    Format: application/pdf
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  • 9
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    Simulating and Interpreting Aerial or Orbital TV Observations of Geographic Patterns (1972)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Simulation and interpretation of aerial or orbital TV and photographic observations of earth geographic patterns
    Keywords: GEOPHYSICS
    Type: NASA-CR-126254 , USGS-DO-72-004 , USGS-IR-NASA-223 , TR-5
    Format: application/pdf
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  • 10
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    Remote sensing of environmental disturbance (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Color, color infrared, and minus-blue films obtained by RB-57 remote sensing aircraft at an altitude of 60,000 feet over Boca Raton and Southeast Florida Earth Resources Test Site were analyzed for nine different types of photographic images of the geographic patterns of the surface. Results of these analyses are briefly described.
    Keywords: GEOPHYSICS
    Type: Simulating and Interpreting Aerial or Orbital TV Observations of Geographic Patterns; p 100-103|Ann. Meeting of Southeast Div., Assoc. of Am. Geographers; Nov 23, 1970; Columbia, SC; United States
    Format: application/pdf
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