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  • 1
    Publication Date: 2016-03-09
    Description: The latitudinal distributions of delta H, delta X, delta Y, and delta Z were studied for quiet and disturbed periods. For quiet periods, the average patterns showed some variations common to dusk and dawn, thus indicating probable ground anomaly. However, there were significant differences too between dusk and dawn, indicating considerable diurnal variation effects. Particularly in delta Y, these effects were large and were symmetric about the dip equator. For disturbed day passes, the quiet day patterns were considered as base levels and the latter were subtracted from the former. The resulting residual latitudinal patterns were, on the average, symmetric about the geographical equator. However, individual passes showed considerable north-south asymmetries, probably indicating meanderings of the central plane of the magnetospheric ring current.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: INPE-2523-RPE/415 , NASA-CR-169316 , NAS 1.26:169316 , E82-10369
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  • 2
    Publication Date: 2016-03-09
    Description: The MAGSAT data for the period Nov. 2-20, 1979 were studied. From the observed H, the HMD predicted by model was subtracted. The residue delta H = H-HMD shows storm-time variations similar to geomagnetic Dst, at least qualitatively. Delta H sub 0, i.e., equatorial values of delta H were studied separately for dusk and dawn and show some differences.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: INPE-2297-RPE/401 , E82-10359 , NAS 1.26:168980 , NASA-CR-168980
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  • 3
    Publication Date: 2016-03-09
    Description: Geomagnetic field variations were studied by considering the parameter delta H which indicated H(observed) minus H(model), where H = (X squared + Y squared) (1/2) where X, Y, and Z are the components actually observed. Quiet time base values for 5 deg longitude belts were estimated. After subtracting these from the observed values, the residual delta H (dawn) and delta H (dusk) were studied for the two major storms. It was noticed that the dusk values attained larger (negative) values for a longer time, than the dawn value. Some changes in delta Y and delta Z were also noticed, indicating possibilities of either meridional currents and/or noncoincidence of the central plane of the ring current with the equatorial plane of the Earth. Other details are described.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NAS 1.26:168904 , NASA-CR-168904 , INPE-2367-RA/161-PT-2 , E82-10325
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  • 4
    Publication Date: 2016-03-09
    Description: Imagery obtained with channels 5 and 7 was visually interpreted in an effort to determine the spatial, spectral, and temporal characteristics of a 105,000 hectare area of Fazenda Mutum which was reforested with various species of pine and eucalyptus. It was possible to map a reforested area as small as 6 hectare in its initial implantation using contrast with the surrounding targets. Five classes were mapped: nondeforested areas, partially deforested areas, deforested areas, partially reforested areas, and fully reforested areas. In 1979, 12,000 hectare were deforested, 4,330.83 hectare were partially reforested, and 42,744.71 hectare were reforested.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-168831 , NAS 1.26:168831 , INPE-2091-RPE/321 , E82-10250
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  • 5
    Publication Date: 2016-03-09
    Description: Techniques of data acquisition by remote sensing are introduced in this teaching aid. The properties of the elements involved (radiant energy, topograph, atmospheric attenuation, surfaces, and sensors) are covered. Radiometers, photography, scanners, and radar are described as well as their products. Aspects of the LANDSAT system examined include the characteristics of the satellite and its orbit, the multispectral band scanner, and the return beam vidicon. Pixels (picture elements), pattern registration, and the characteristics, reception, and processing of LANDSAT imagery are also considered.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NAS 1.26:168596 , INPE-2226-MD/013 , NASA-CR-168596 , E82-10173
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  • 6
    Publication Date: 2016-03-09
    Description: The importance of the choice of the carrying vehicle in aerial surveys of natural radioactivity, particularly in the location of uraniferous regions, is discussed. The results of observations depend on the exposure time, that is, the velocity and altitude the carrying vehicle can attain. Overflights of the same region using identical instrumentation but in two different types of aircraft were performed. A detailed statistical analysis of the measurements obtained during these flights demonstrates the precision of localization achievable by this method.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: INPE-2203-PRE/019 , NASA-CR-168592 , E82-10169 , NAS 1.26:168592
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  • 7
    Publication Date: 2016-03-09
    Description: The use of LANDSAT multispectral scanner and return beam vidicon imagery for surveying the natural resources of the Brazilian Amazonas is described. Purposes of the Amazonas development project are summarized. The application of LANDSAT imagery to identification of vegetation coverage and soil use, identification of soil types, geomorphology, and geology and highway planning is discussed. An evaluation of the worth of LANDSAT imagery in mapping the region is presented. Maps generated by the project are included.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: INPE-2019-NTE/166 , NASA-CR-165091 , E82-10069 , NAS 1.26:165091
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  • 8
    Publication Date: 2016-03-09
    Description: The synoptic view and the repetitive acquisition of LANDSAT imagery provide precise information, in real-time, for monitoring preserved areas based on spectral, temporal and spatial properties. The purpose of this study was to monitor, with the use of multispectral imagery, the systematic annual burning, which causes the degradation of ecosystems in the National Park of Araguaia. LANDSAT imagery of channel 5 (0.6 a 0.7 microns) and 7 (0.8 a 1.1 microns), at the scale of 1:250.000, were used to identify and delimit vegetation units and burned area, based on photointerpretation parameter of tonality. The results show that the gallery forest can be discriminated from the seasonally flooded 'campo cerrado', and that 4,14% of the study area was burned. Conclusions point out that the LANDSAT images can be used for the implementation of environmental protection in national parks.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: INPE-2064-RPE/306 , NAS 1.26:165087 , NASA-CR-165087 , E82-10065
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  • 9
    Publication Date: 2016-03-09
    Description: LANDSAT imagery was used to determine the amount of deforestation in a study area comprising 55 million hectares of the Amazon region. Results show that more than 4 million hectares were deforested. Maps and pictures of the deforested area in relation to the total area of the Amazon are included.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-163759 , E81-10049 , INPE-1411-NTE/142
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  • 10
    Publication Date: 2016-03-09
    Description: The relationship between pasture quality and geomorphology was verified by applying visual and automatic interpretation techniques to LANDSAT data. The results show that LANDSAT data is useful to point out better areas to settle pastures.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-163767 , E81-10059 , INPE-1756-RPE/145
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