Abstract
In recent years, cultivation methods of rice have been diversified due to the low cost of rice-growing techniques. For example, there is direct sowing of seed rice in paddy field in addition to the practice of usual paddy field to flooding at the time of planting. The yield of the usual paddy field and the direct sowing is different even though the same varieties are grown in the same area. It is necessary to grasp by performing classification for the usual paddy field or direct sowing for the management of agricultural crops. The main objective of this study was to select the observation time for the classification of paddy fields’ planting conditions by utilizing Synthetic Aperture Radar TerraSAR-X satellite. The planting conditions included the usual planting of rice, the direct sowing of rice and the soybean. We selected the observation time by the statistical distance of the microwave backscattering in each paddy field for maximizing the planting condition classification. In addition, the satellite data observation timing considered the processing time of the analysis and the acquisition costs. The acquisition was performed 4 periods from 2 periods in the rice growing season and the planting phase. In the current study, we were able to classify the usual planting of rice, the direct sowing of rice and the soybean by TerraSAR-X data for the later planting of rice during mid-May and initial growth of rice in early June.
Highlights
The government in the agricultural sector needs to collect the information for food production planning or supply and demand
Y-axis is the degree of classifications and X-axis is polarizations and observation times
The degree of classifications of the usual planting and the soybean were increased during early June
Summary
The government in the agricultural sector needs to collect the information for food production planning or supply and demand. The Ministry of Agriculture, Forestry and Fisheries in Japan is conducting the research projects for the condition of rice cultivation in paddy fields corresponding to mid-August. The direct sowing technique for paddy rice has encouraged the production of low-cost rice cultivation. Our purpose was for checking the paddy condition including the direct sowing of the production plan. Several studies have been conducted for checking the paddy field condition over wide areas utilizing spaceborne optical and Synthetic Aperture Radar (SAR) sensors (Okamoto and Fukuhara, 1996), (Kurosu et al, 1997), (Ribbes and Toan, 1999), (Ishitsuka, 2006), (Kimura and Shimamura, 2010) and (Kimura and Shimamura, 2015). A number of researchers have been conducting the investigations for rice paddy extraction utilizing SAR information
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