在十九世纪末叶,欧洲一位科学工作者乘坐汽球作低空飞行试验,忽然观测到河流上游由于暴雨致使河水猛涨,大水奔腾而下,下游正在捕鱼的渔民还不知道,这位观察者赶紧向渔民大声呼号险情,避免了一场灾难。这便是世界上的第一次“遥感”。但是,遥感这个词大约是在1958年由美国首先使用。顾名思义,遥感就是对遥远目标的感知。确切地说,遥感技术就是从运载工具上,通过各种传感器接受来自地面背景或目 At the end of the nineteenth century, a scientist in Europe took a balloon test at low altitude. Suddenly he observed that the upper reaches of the river had caused the river to soar due to the heavy rainfall. The floodwaters ran down and the fishermen who were fishing downstream did not know yet. The observer hurled to the fisherman quickly call the danger, to avoid a disaster. This is the first “remote sensing” in the world. However, the term remote sensing was first used by the United States in about 1958. As the name suggests, remote sensing is the perception of distant objects. Specifically, remote sensing technology is from the vehicle, through a variety of sensors to accept from the ground background or head