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  • EARTH RESOURCES AND REMOTE SENSING  (148)
  • Life and Medical Sciences  (50)
  • 1980-1984  (197)
  • 1940-1944
  • 1920-1924  (1)
  • 1981  (197)
  • 1922  (1)
Collection
Keywords
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  • 1980-1984  (197)
  • 1940-1944
  • 1920-1924  (1)
Year
  • 11
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    Winter wheat: A model for the simulation of growth and yield in winter wheat (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The basic ideas and constructs for a general physical/physiological process level winter wheat simulation model are documented. It is a materials balance model which calculates daily increments of photosynthate production and respiratory losses in the crop canopy. The partitioning of the resulting dry matter to the active growing tissues in the plant each day, transpiration and the uptake of nitrogen from the soil profile are simulated. It incorporates the RHIZOS model which simulates, in two dimensions, the movement of water, roots, and soluble nutrients through the soil profile. It records the time of initiation of each of the plant organs. These phenological events are calculated from temperature functions with delays resulting from physiological stress. Stress is defined mathematically as an imbalance in the metabolite supply; demand ratio. Physiological stress is also the basis for the calculation of rates of tiller and floret abortion. Thus, tillering and head differentiation are modeled as the resulants of the two processes, morphogenesis and abortion, which may be occurring simulaneously.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10367 , NASA-CR-169164 , YM-U2-04281 , JSC-18229 , NAS 1.26:169164
    Format: application/pdf
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  • 12
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    Discrimination of a chestnut-oak forest unit for geologic mapping by means of a principal component enhancement of Landsat multispectral scanner data (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Geophysical Research Letters; 8; Feb. 198
    Format: text
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  • 13
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    Prospects for TLRS baseline accuracies in the western USA (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: One of the main goals of the LAGEOS satellite mission is the detection of regional geotectonic movements. A parametric study with the intention to obtain the optimal baseline precision from dynamic solutions of laser ranging to LAGEOS is presented. The varied parameters are: length of reduced arc, number of tracking stations, data noise and rate, biases, refraction errors, system efficiency, gravity model errors in the value of GM. The baseline precisions are 1-10 cm depending upon the set of parameters adopted. General principles obtained are also presented.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TM-82133
    Format: application/pdf
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  • 14
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    Evaluation of HCMM satellite data for estuarine tidal circulation patterns and thermal inertia soil moisture measurements (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Digital thermal maps of the Cooper River (SC) and the Potomac River estuaries were prepared from heat capacity mapping radiometer (HCMR) tapes. Tidal phases were correctly interpreted and verified. Synoptic surface circulation patterns were charted by location thermal fronts and water mass boundaries within the estuaries. Thermal anomalies were detected adjacent of a conventional power plant on the Potomac. Under optimum conditions, estuaries as small as the Cooper River can be monitored for generalized thermal/tidal circulation patterns by the HCMM-type IR sensors. The HCMM thermal inertia approach to estimating soil moisture at the Luverne (MN) test site was found to be unsatisfactory as a NESS operational satellite technique because of cloud cover interference. Thermal-IR data show similar structure of the Baltimore and Washington heat islands when compared to NOAA AVHRR thermal-IR data. Thermal anomalies from the warm water discharge water of a nuclear power plant were mapped in Lake Anna, Virginia.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10064 , NASA-CR-165086 , NAS 1.26:165086
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  • 15
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    Wheat cultivation: Identification and estimation of areas using LANDSAT data (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The feasibility of using automatically processed multispectral data obtained from LANDSAT to identify wheat and estimate the areas planted with this grain was investigated. Three 20 km by 40 km segments in a wheat growing region of Rio Grande do Sul were aerially photographed using type 2443 Aerochrome film. Three maps corresponding to each segment were obtained from the analysis of the photographs which identified wheat, barley, fallow land, prepared soil, forests, and reforested land. Using basic information about the fields and maps made from the photographed areas, an automatic classification of wheat was made using MSS data from two different periods: July to September and July to October 1979. Results show that orbital data is not only useful in characterizing the growth of wheat, but also provides information of the intensity and extent of adverse climate which affects cultivation. The temporal and spatial characteristics of LANDSAR data are also demonstrated.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10007 , NASA-CR-164905 , INPE-2054-RPE/300
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  • 16
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    Wheat cultivation: Identifying and estimating area by means of LANDSAT data (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Automatic classification of LANDSAT data supported by aerial photography for identification and estimation of wheat growing areas was evaluated. Data covering three regions in the State of Rio Grande do Sul, Brazil were analyzed. The average correct classification of IMAGE-100 data was 51.02% and 63.30%, respectively, for the periods of July and of September/October, 1979.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10176 , NASA-CR-168599 , NAS 1.26:168599 , INPE-2204-RPE/397
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  • 17
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    Evaluation of HCMM data for assessing soil moisture and water table depth (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Soil moisture in the 0-cm to 4-cm layer could be estimated with 1-mm soil temperatures throughout the growing season of a rainfed barley crop in eastern South Dakota. Empirical equations were developed to reduce the effect of canopy cover when radiometrically estimating the soil temperature. Corrective equations were applied to an aircraft simulation of HCMM data for a diversity of crop types and land cover conditions to estimate the soil moisture. The average difference between observed and measured soil moisture was 1.6% of field capacity. Shallow alluvial aquifers were located with HCMM predawn data. After correcting the data for vegetation differences, equations were developed for predicting water table depths within the aquifer. A finite difference code simulating soil moisture and soil temperature shows that soils with different moisture profiles differed in soil temperatures in a well defined functional manner. A significant surface thermal anomaly was found to be associated with shallow water tables.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10329 , NASA-CR-168944 , NAS 1.26:168944 , SDSU-RS1-81-04
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  • 18
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    Use of an automatic procedure for determination of classes of land use in the Teste Araras area of the peripheral Paulist depression (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An evaluation of the multispectral image analyzer (system Image 1-100), using automatic classification, is presented. The region studied is situated. The automatic was carried out using the maximum likelihood (MAXVER) classification system. The following classes were established: urban area, bare soil, sugar cane, citrus culture (oranges), pastures, and reforestation. The classification matrix of the test sites indicate that the percentage of correct classification varied between 63% and 100%.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10171 , NASA-CR-168594 , NAS 1.26:168594 , INPE-2155-RPE/374 , Ann. Meeting of SBPC; Jul 08, 1981 - Jul 15, 1981; Salvador; Brazil
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  • 19
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    Evaluation of HCMM data for assessing soil moisture and water table depth (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Data were analyzed for variations in eastern South Dakota. Soil moisture in the 0-4 cm layer could be estimated with 1-mm soil temperatures throughout the growing season of a rainfed barley crop (% cover ranging from 30% to 90%) with an r squared = 0.81. Empirical equations were developed to reduce the effect of canopy cover when radiometrically estimating the 1-mm soil temperature, r squared = 0.88. The corrective equations were applied to an aircraft simulation of HCMM data for a diversity of crop types and land cover conditions to estimate the 0-4 cm soil moisture. The average difference between observed and measured soil moisture was 1.6% of field capacity. HCMM data were used to estimate the soil moisture for four dates with an r squared = 0.55 after correction for crop conditions. Location of shallow alluvial aquifers could be accomplished with HCMM predawn data. After correction of HCMM day data for vegetation differences, equations were developed for predicting water table depths within the aquifer (r=0.8).
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10165 , NASA-CR-168588 , NAS 1.26:168588 , SDSU-RSI-81-04
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  • 20
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    Technical aspects of forest inventory demonstrations using Landsat data - Projects in the Pacific Northwest States (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Canadian Symposium on Remote Sensing; May 21, 1980 - May 23, 1980; Halifax; Canada
    Format: text
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