The surveys of planting crops and conditions of the paddy fields are necessary for agricaltual policies. The Synthetic Aperture Radar (SAR) satellites can perform observations of the earth surface regardless of weather conditions and highly suitable for deciding the observation period of the paddy fields.
The purpose of the studies were to logically select the observation duration, the incident angles and polarizations of SAR data for surveying the planting conditions of the paddy fields. The fields of usual planting of rice, the direct sowing of rice and the soybean were selected for conducting the studies. These cropped fields were observed utilizing TerraSAR-X SAR satellite at the multiple observation periods, by the multiple incident angles and by the multiple polarizations. The best SAR data conditions for surveying the planting condition of paddy fields were logically selected from the multiple acquisitions of the SAR data. We used interclass distance of each number of scenes for extracting the suitable SAR condition.
The results were revealed as follows ; The image acquisition period, incidence angle and polarization were considered for selecting the most suitable the observation period of mid-May, late May and early June due to VV polarization having an incident angle of 21 degrees. Further, the usual planting of rice, direct sowing of rice and soybean were classified with higher accuracy and the map of paddy fields classification was established.
高価なIMU（Inertial Measurement Unit）の代替としてデジタルカメラを用いることにより，UAVに搭載する比較的安価な航空レーザ測量システムの開発を検討している。本稿では，システム要件を示すとともに，画像とレーザ測距を組み合わせたバンドル調整計算により機体の高精度な位置および姿勢の推定を行う方法について，基本的な動作の検証を行った結果を報告する。
Michi-no-eki is a roadside station, which provides information, offers facilities and space for taking rest, and promotes local cooperation in order to improve road and traffic environment and develop local economic activities in Japan. Recently, many new constructions of Michi-no-eki are planned to build. Unfortunately, the managerial performance of part of Michi-no-eki is not as expected because the number of customers is small and facilities are getting old. Obviously, the number of customers is one of the key factors of the development of Michi-no-eki. With the aim of finding the appropriate locations of Michi-no-eki, a correlation analysis between land use and the number of customers of Michi-no-eki in Kyusyu region is implemented in this paper. Seven prefectures of Fukuoka, Saga, Nagasaki, Kumamoto, Oita, Miyazaki, and Kagoshima are included in Kyusyu region. Ten different categories of lands are divided in this paper. They are rice field, other agricultural lands, forest, wastelands, building lots, road, railway, other sites, river and lake, and beach. The implication of the relationship between land use and the number of customers are discussed.
Four quasi-zenith satellites (QZS) in Japan was completed at 10th October 2017. As a result, QZS system can be able to observe in 24 hours. Since QZS has a special orbit, it is possible to stay at the zenith of Japan for a long time. In this paper, we describe QZS system and relationship between QZS and other GNSS. QZS has two Japanese special service which is called centimeter and sub-meter grade. Each type is adopted many service for traffic, railroad, civil engineering, and maps. The application using QZS contributes to security, safety and comfortable life for safety confirmation, navigation, logistics, construction and agriculture.