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冰川冻土 ›› 1983, Vol. 5 ›› Issue (1): 71-78.

• 研究论文 • 上一篇    下一篇

利用陆地卫星象片量测冰川变化

米德生, 罗祥瑞   

  1. 中国科学院兰州冰川冻土研究所
  • 收稿日期:1981-09-19 出版日期:1984-02-25 发布日期:2012-04-26

VARIATIONS OF THE GLACIERS DETECTED FROM LANDSAT MSS IMAGES

Mi Desheng, Luo Xiangrui   

  1. Lanzhou Institute of Glaciology and Cryopedology, Academia Sinica
  • Received:1981-09-19 Online:1984-02-25 Published:2012-04-26

摘要: 大中比例尺航测地图是冰川研究工作中基本资料之一,从地图上可以了解到冰川某些数据,因此,人们期望用不同时期航测地图的比较以求得冰川面积和长度的变化。但是,航测地图的供应与冰川研究的需求仍有一定差距。自七十年代以来宇航规划转向研究地球资源为主要目标,其中陆地卫星每间隔18天或9天能够重复扫描地球上同一地区影象,从而缓和了航测地图的供求矛盾。

Abstract: The article introduces the methods of measuring the glacier area and the glacier advance or retreat on the topographic maps and the satellite mages.Three instruments are used for the measurement: a5-time magnifier,a transparent gridded overlay and a glass straight edge with 0.1mm reading. Its accuracy and error are also discussed.The main error in glacier area measurement is from the glacier boundary which may reach about ?10 percent on the landsat images.The reliability of amount of glacier advance or retreat is influenced by the residual error. But this influence can be eliminated.The error for measuring the glacier advance or retreat comes mainly from the dimension of pixel,the accuracy of the maps and the method used.But the error of mean square is not more then ?100m which represents the accuracy for measuring the glacier advance or retreat on satellite images.