Junki abe
Grasp of the time series the character of spectral reflectance and a vegetation coverage in growing season rice by a terrestrial observation
Atsushi Rikimaru Kenta Sakata
In recent years, the labor productivity of the rice cropping of Japan went up sharply by mechanization. But, the quantity of production of rice in recent years is superfluous, and the price of rice is falling. The producer side needs the yield of rice, and to stabilize a flavor and to expect annual profit to some extent. Therefore, in rice agriculture, research aiming at the increase in efficiency of a rice crop and laborsaving is advanced with the quality maintenance of rice, and yield stability. It is made desirable to diagnose growth of rice in an early stage especially. The growth investigation conducted there can be investigated to the details of rice, and is effective in the growth diagnosis in an early stage. However, since time is taken in the growth investigation conducted there, it is difficult to diagnose all the cultivated lands of the paddy field over which it is distributed broadly. Therefore, the grasp using the remote sensing technology which can obtain wide range information of growth information attracts attention.
In this research, the characteristic of the spectral reflectance of rice and a vegetation rate has been grasped by the terrestrial observation. Moreover, the spectral reflectance of rice was computed using the satellite imagery, and it aimed at considering a relation with the spectral reflectance by a terrestrial observation. First, in the visible range, reflectance decreased and earing up has checked the increasing tendency after it. In the near-infrared region, reflectance increased to earing up and it has checked the tendency which decreases after it. And about the relation between a spectral reflectance and a vegetation rate, high correlation was found in the near-infrared region. Moreover, although the reflectance computed from the satellite imagery acquired using Landsat-7 was compared with the reflectance obtained by the terrestrial observation, and it was with error, the tendency with both same reflectance was seen. A possibility that the growth information on a cultivated land that it is distributed broadly could be grasped from these results using an artificial satellite picture was suggested.
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