農業気象における人工衛星データの利用に関する研究

書誌事項

タイトル別名
  • Applications of Satellite Data to the Studies of Agricultural Meteorology
  • ノウギョウ キショウ ニ オケル ジンコウ エイセイ データ ノ リヨウ ニ
  • (2) Relationship between Air Temperature and Surface Temperature Measured by Infrared Thermal Radiometer
  • (2)気温と赤外放射温度計による地表面温度との関係

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抄録

Experiments were performed in order to establish interpretation keys for estimation of air temperature from satellite IR data. Field measurements were carried out over four kinds of land surfaces including seven different field crops on the university campus at Sapporo. The air temperature was compared with the surface temperature measured by infrared thermal radiometer (National ER2007, 8.5-12.5μm) and, also with other meteorological parameters (solar radiation, humidity and wind speed). Also perpendicular vegetation index (PVI) was measured to know vegetation density of lands by ho radio-spectralmeter (Figs. 1 & 2). Table 1 summarizes the measurements taken in these experiments.<br>The correlation coefficients between air temperature and other meteorological parameters for each area are shown in Table 2. The best correlation coefficient for total data was obtained with surface temperature, and it suggests the possibility that air temperature may be estimated by satellite IR data since they are related to earth surface temperatures.<br>Further analyses were done between air temperature and surface temperature measured with thermal infrared radiometer.<br>The following conclusions may be drawn:<br>(1) Air temperature from meteorological site was well correlated to surface temperature of lands that were covered with dense plant and water, for example, grass land, paddy field and rye field (Table 2).<br>(2) The correlation coefficients and the regression equations on grass land, paddy field and rye field were almost the same (Fig. 3). The mean correlation coefficient for these three lands was 0.88 and the regression equation is given in Eq. (2).<br>(3) There was good correlation on bare soil land also, but had large variations (Fig. 3).<br>(4) The correlations on crop fields depend on the density of plant cover. Good correlation is obtained on dense vegetative fields.<br>(5) Small variations about correlation coefficients were obtained for the time of day (Table 3).<br>(6) On the other hand, large variations appeared with the season even on grass land, paddy field and rye field that had good overall correlation coefficients (Table 4).<br>The following items are presumed from the above conclusion for the estimation of air temperature from satellite IR data.<br>1. Good estimation is expected on the extended areas of grass lands and paddy fields.<br>2. For crop fields the large seasonal variations may occur but good estimation will be obtained on densely vegetated surface.<br>3. The variations caused by the time of day will be small.

収録刊行物

  • 農業気象

    農業気象 40 (4), 379-385, 1985

    日本農業気象学会

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