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

(1)研制了一种紧凑而相对便宜的近地环境数据测量系统。该系统由一个小型直流发电机、一个数据记录仪、一个无线电话、一个调制解调器、电线杆、一个小衣架组成。该测量系统在没有交流电和电话线的情况下是有用的。(2)在北海道（3套）、筑波市、酒井市、山口市共设置了6套测量系统，并构建了测量网络。由5个研究机构在6个地点进行了长时间的连续蒸散发和热耗测量。(3)制作了测量系统所需时间的采集和遥测软件。每个用户都可以直接访问测量系统并从系统中获取数据，如果他们有一台带有调制解调器、电话线和软件的计算机。这样每个用户都可以像一个数据采集中心。(4)采用PC-VAN等技术在5家机构间搭建通信网络，用于机构间数据分析结果的收发。(5)通过(1)-(4)，我们完成了一个测量、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.