ICESat-1/GLAS数据湖泊水位监测研究进展

Research Progress of ICESat-1/GLAS in Lake Level Monitoring

湖泊水位动态监测和调查对湖泊资源利用、水循环过程和生态环境变化等研究具有重要意义。ICESat-1/GLAS激光测高数据已经在全球陆地、森林植被和极地冰盖变化监测等方面得到了广泛应用,但在湖泊、河流等内陆水体监测方面的应用研究相对较少。本研究系统分析了国内外利用GLAS数据,以及GLAS和其他卫星测高数据、光学遥感数据联合反演湖泊物理参数方面的研究进展,探讨了该数据在湖泊应用中的关键技术和难点,如GLAS数据的精度评价、湖泊脚印点自动提取等,分析了目前研究中存在的问题,以期对我国即将发射的高分七号测绘卫星在水文方面的应用提供参考。

Lake level dynamic monitoring and investigation play a great significance for lake resource utiliza- tion,water cycle and ecological environment change research. ICESat-1/GLAS laser altimeter has been widely used in global land, forest vegetation and the polar ice sheets change monitoring.However, there are few studies on inland water bodies, such as lakes and rivers. In this paper, the application progress in lake level monitoring using GLAS data,and the fusions of GLAS with satellite altimetry data,GLAS with opti- cal data were explored respectively and detailedly. The critical problems were also discussed, including GLAS data quality and accuracy evaluation,lake surface footprints automatic extraction and other issues in- volved in lake level applications.This paper will be a reference to the potential applications of Chinese GF- 7 satellite to be launched in 2018 and other space-borne laser altimeter data in lake level surveying and mapping.