Development of a net work system for environmental masurement, data acquisition and telemetering.

(1)研制了一套结构紧凑、价格相对低廉的近地面环境数据测量系统。该系统由丙烷气体工作的小型直流发电机、数据记录仪、无线电话、调制解调器、电杆、小型衣架组成。(2)在北海道、筑波、酒井市、山口市共设置了6套测量系统，并搭建了测量网络。通过5个科研机构对6个测点的蒸散量和热量目标进行长期连续测量。(3)编制了测量系统实时采集和遥测的软件。如果每个用户都有一台带有调制解调器、电话线和软件的计算机，他们就可以直接访问测量系统并从系统中获取数据。利用PC-VAN等构建了5个机构间的通信网络，实现了机构间分析数据结果的收发。(5)通过(1)-(4)实现了测量、数据采集和通信网络系统。

(1)A compact and relativerly cheap system for measuring environmental data near the ground was developped. The system is composed of a small DC genearator works with propane gas, a data logger, a wireless telephone, a modem, poles, a small hanger. The measuring system is useful at no AC-electricity and no telephone line.(2)We set up total 6 sets of the measuring system at hokkaido(3 sets), Tsukuba city, Sakai city, Yamaguchi city, and constracted measuring network. Evapotranspiration and heat badget were measured continuously for long periods at the 6 places by 5 research institutions.(3)We made software for acquisiting and telemetering from the measuring systems at desired time. It is possible for every users to access directly to the measuring systems and get data from the systems, if they have a computer with a modem, a telephone line and the software. Then every users can be like a data acquisition center.(4)We made a communication network among 5 institutions with such as PC-VAN for sending and recieving results of analyzed data among institutions.(5)Through (1)-(4), we acomplished a measuring, data acqusitioning and communicating network system.