Taisuke KURASHINA
Extraction of rice growth information from time-series X band radar satellite imagery
Atsushi RIKIMARU,Kazuyoshi TAKAHASHI
The growth of waterfield rice should be understood and be controlled regularly for the consistent production of good quality rice. However, the growth of waterfield rice is understood under the present situation by the site investigation that chiefly depends on people. As for this surveying technique, the grasp that grows, that large time and the labor are necessary, and wide-ranging is also difficult. Therefore, the estimation approach that grows with an optical sensor of the main current now has the problem such as controlling the weather though high expectations are drawn to the application of the remote sensing technology.
Because the observation is enforceable in all weathers, and the atmosphere hardly influences the SAR satellite, it is possible to observe it by a constant standard through year. Therefore, there is interchangeability with past data.
A feature peak of backscatter is formed twice according to X band backscatter base measurement experiment result of the waterfield rice done on the ground growing up. However, the backscatter of waterfield rice is not reported to the example of observing the time series in X band satellite SAR.
Then, the present study observed the backscatter of waterfield rice in the time series by using SAR satellite "TerraSAR-X" where the observation by resolution X band micro wave between upper skies was possible. It aimed to examine the relation between the backscatter observation value and waterfield rice growth information on the radar satellite overall by comparing the result with waterfield rice growth information such as the ground basic measurement experiment result, the plant length, the number of stalks, [harei], and SPAD.
Is it June, 2008 as for the satellite observation?August, August and 2009?It did until September, and the whole of the growth of waterfield rice was chased by the time series. The relation between waterfield rice growth information and the satellite observation data obtained by the local waterfield rice growth investigation executed to a satellite observation and a simultaneous period was analyzed. NDVI of ALOS AVNIR-2 was analyzed as a comparison with the optical sensor data as the satellite observation data. The content of the protein and the content of the amylose were analyzed as a comparison with the food taste data as the satellite observation data.
The backscatter observation value decreased from about 40 after it cropped it, and increased again after the 80th when the time series was analyzed before the satellite observation result was harvested at the first term of growth of waterfield rice. This result showed that the peak of X band backscatter was caused two times as waterfield rice grew up, and was able to confirm the result similar to the ground measurement result.
The backscatter observation value of waterfield rice became a result including the noise element of each field. Therefore, a clear correlation of waterfield rice growth information and the satellite observation result was not able to be confirmed.
However, the backscatter observation value decreased as waterfield rice grew up, and had risen since time when the surface part of the field was composed in respect when the relation between the waterfield rice growth investigation result and the satellite observation result of each field was seen.
It did not come to confirm the correlation that both are clear as a result of analyzing the satellite observation result as related about the optical sensor data and the food taste data.
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