七十年代以来美国土地调查遙感应用的发展

第二次世界大战以后,美国的土地利用研究把大量注意力放在城市化及共对土地利用的影响上,许多部门忙于编制土地利用现状图,以便为城市的扩展进行有效的规划,用全色中比例尺航片进行土地利用制图,则是人们公认的收集土地利用信息的合适方法。

THE DEVELOPMENT OF REMOTE SENSING FOR LAND SURVEY IN USA SINCE 1970’S

Because of the arising of the modern remote sensing and space techniques, the scientific research of remote sensing techniques for land survey in USA has been rapidly developing since 1970's. The presence of the USGS land use and land cover classification system for use with remote sensor data is one of the most important events of USA land survey during this period.At the same time studies in applications of remote sensed images from various platforms and sensors to land surveys have achieved great successes, while great advances in the techniques of acquiring and processing images have been made. Diverse image-analysis techniques are actively developing, including manual interpretation techniques aided with photo-electronic devices and computer-assisted analysis techniques. After landsat 4 MSS becomes a forma] operational sensor, quite a bit of attention is being paid to the application potential of the new type sensed data TM. The preliminary experiments have shown that TM data are very efficient means of surveying agriculture and urban land use. Experts say that the space shuttle flight will be one of the most favorable options of Earth remote sensing for users in the late 1980's as well as in the 1990's.In relation to the practice in China, finally, this paper makes some suggestions in view of the special situation of remote sensing research in land survey in China.