Abstract: The top priority of the monitoring the build paddy fields is to cultivate rice at least once a year. In order to realize low-cost and high-efficiency monitoring, the rice recognition technology based on Sentinel-1A images with high revisit is applied in the monitoring of built paddy fields in Guangdong province, and the results are verified by field photos. The results show that the overall accuracy of the identification results of the first rice is 85.02%, and that of the second rice is 90.46%, which indicates that this method is practicable to judge the rice planting situation, and can effectively narrow the field verification scope and improve the monitoring efficiency.

Key words: SAR images, high revisit, rice, build paddy fields, monitoring