三、遥感的发展动态目前世界各国都在迅速发展遥感技术,在130个国家中有660个研究和生产应用遥感技术的机构。但现在使用的遥感磁带还不到2.4,使用的图片不到5%。美国应用较多,美国导航局有200个美国科学家和100个其他国家的顾问。截止现在世界各国射入太空的人造卫星不少于2100个。其中苏美两国发射了1900余个。而资源卫星仅美国一家,美国于1972年7月发射了第一颗,1975年1月发射了第二颗,1978年3月又发射了第三颗。这种卫星主要用于勘测地球资源。第一颗原予计使用两年,实际上使用了五年半。他们利用第一颗地 Third, developments in remote sensing At present, all countries in the world are rapidly developing remote sensing technology. There are 660 institutions in 130 countries that research and produce remote sensing technology. But now the remote sensing tape is less than 2.4 and uses less than 5% of the pictures. There are more applications in the United States. NASA has 200 U.S. scientists and 100 consultants from other countries. As of now, no fewer than 2,100 satellites are launched into space in various countries of the world. Among them, more than 1,900 were fired by the Soviet Union and the United States. The resource satellites are only the United States. The United States launched the first one in July 1972, the second one in January 1975 and the third one in March 1978. This satellite is mainly used to survey the earth’s resources. The first one was originally used for two years, actually used for five and a half years. They use the first ground