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  • 1
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    Exploratory flight investigation of ride quality in simulated STOL environment (1972)
    In:  CASI
    Details
    Publication Date: 2006-04-26
    Description: A flight test experiment is described, in which various aspects of ride qualities were explored. Situations included simulated cruise and terminal area maneuvers, as might be typical of STOL transport operations. Various motion components were studied in isolation and in many combinations. The experiment included runs with and without turbulence, variations in airplane stability and handling qualities, and differences of pilot technique. The ride quality was strongly affected by roll, yaw, and heave motions; but very little by pitching. It was strongly affected by airplane stability and handling qualities and, in some cases, by piloting technique.
    Keywords: AIRCRAFT
    Type: NASA. Langley Res. Center Symp. on Vehicle Ride Quality; p 67-89
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    CRRES combined radiation and release effects satellite program (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The various regions of the magnetosphere-ionosphere system are coupled by flows of charged particle beams and electromagnetic waves. This coupling gives rise to processes that affect both technical and non-technical aspects of life on Earth. The CRRES Program sponsored experiments which were designed to produce controlled and known input to the space environment and the effects were measured with arrays of diagnostic instruments. Large amounts of material were used to modify and perturb the environment in a controlled manner, and response to this was studied. The CRRES and PEGSAT satellites were dual-mission spacecraft with a NASA mission to perform active chemical-release experiments, grouped into categories of tracer, modification, and simulation experiments. Two sounding rocket chemical release campaigns completed the study.
    Keywords: GEOPHYSICS
    Type: NASA-TM-108494 , NAS 1.15:108494
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A look at the commonly used LANDSAT vegetation indices (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The origins, development, and logic of the indices are discussed. The relationships of the indices to ground-based measurements of vegetation are highlighted. An effort was made to preserve the order in which the various indices appeared in the literature in order to historically trace their underlying concepts.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10123 , NASA-CR-167474 , NAS 1.26:167474 , EW-L1-04134 , JSC-17413 , LEMSCO-16844
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Area estimation of environmental phenomena from NOAA-n satellite data (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A technique for documenting changes in size of NOAA-n pixels in order to calibrate the data for use in performing area calculations is described. Based on Earth-satellite geometry, a function for calculating the effective pixel size, measured in terms of ground area, on any given pixel was derived. The equation is an application of the law of sines plus an arclength formula. Effective pixel dimensions for NOAA 6 and 7 satellites for all pixels between nadir and the extreme view angles are presented. The NOAA 6 data were used to estimate the areas of several lakes, with an accuracy within 5%. Sources of error are discussed.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10275 , NASA-CR-167569 , EW-L1-04190 , JSC-17437 , NAS 1.26:167569 , LEMSCO-17312
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Fixed-base visual simulation of obstacle avoidance during terminal descent of advanced Apollo spacecraft with an all-flexible parawing (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Fixed-base visual simulation study for ability determination of onboard pilot during landing
    Keywords: AIRCRAFT
    Type: NASA-TN-D-5940 , L-7116
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    An ERTS-1 study of coastal features on the North Carolina coast (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10513 , NASA-CR-138263
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Light interception and leaf area estimates from measurements of grass canopy reflectance (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Grassland is a major component of the earth's available land. The vast area and remoteness of this ecosystem makes it difficult to assess its condition and monitor productivity by traditional methods. Remote sensing potentially offers a rapid nondestructive approach for monitoring such ecosystems. A study was carried out in a tallgrass prairie site near Manhattan, Kansas, during the 1983 and 1984 seasons to investigate the feasibility of estimating light interception and green leaf area index (LAI) from measurements of canopy multispectral reflectance. Greenness (Gn) index was found to be strongly correlated with intercepted photosynthetically active radiation (PAR). Two methods, a direct regression (RGR) and an indirect approach (IND), were used to estimate LAI from Gn index. The LAI values estimated by RGR method were consistently lower than the measured ones; however, good agreement was obtained between the LAI values estimated by IND method and the measured LAI. This suggests that Gn transformation of canopy spectral reflectance is more closely related to the fraction of intercepted PAR by green foliage than the quantity of green LAI.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-24; 76-82
    Format: text
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    NASA TECHNICAL REPORTS
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