基于高分卫星数据的冰川长度综合提取方法

冰川长度是冰川变化研究中的重要参数。以青藏高原普若岗日冰原为研究对象，基于高分一号卫星遥感影像和数字高程模型数据，利用波段阈值法和目视解译相结合的方法提取冰川边界，综合利用冰川中心线法和冰川主流线法获取冰川长度，并在地理信息系统技术支持下进行了实现。结果表明，提取的冰川长度线与人工数字化的冰川长度线吻合度较好，精度可达97.9%，且执行效率较高。

An integrated method of glacier length extraction based on Gaofen satellite data

Glacier length is a major parameter to describe glacier change and climate change.In this study,the methods of extracting glacier mainstream line and glacier center line are integrated to extracting glacier length.This integrated method is based on Gaofen-1 satellite remote sensing data and digital elevation model (DEM),and is tested upon the Purog Kangri ice field on the Tibetan Plateau.First,the glacier boundary is extracted by the band threshold method and visual interpretation.Then the glacier length is extracted by the glacier mainstream line method,the glacier center line method and the integrated method,respectively.The results show that the mainstream line method has the higher accuracy when the glacier area is larger than 1 km2,while the center line method has the higher accuracy when the glacier area is smaller than 1 km2.The integrated method has the highest accuracy,97.9％,with high efficiency.