基于多源雷达高度计数据的高亚洲湖泊水位变化数据集

A dataset of lake level changes in High Mountain Asia using multialtimeter data

湖泊水位是全球环境变化和水资源动态变化的重要指标。高亚洲湖泊众多,开展湖泊水位变化监测对研究该区域的气候变化和生态环境变化具有重要意义。但高亚洲地区水文站点稀少且站点设置极为不易,地面观测较为困难。卫星测高技术的发展为湖泊水位变化监测带来机遇,为此本文利用多源雷达高度计数据和MODIS影像数据经湖泊边界提取、水位计算、水位异常值剔除、高斯滤波去噪、高程系统转换等过程,提取了高亚洲地区87个湖泊2002–2017年的水位变化数据集。本数据集包括87个湖泊的单天水位、月平均水位和年平均水位,以及2002–2017年的水位变化率。本数据集可为监测高亚洲地区湖泊水体动态变化规律、气候和环境变化研究以及水资源管理等提供基础数据支持。

Lake water levels are important indicators of global environmental changes and dynamics of water resources.High Mountain Asia is a region dotted with lakes,and monitoring lake level changes is important for the research of climate and ecological changes in the region.However,it is extremely difficult to carry out ground measurements of lake levels due to scarce hydrological sites.The development of satellite altimetry technology is conducive to monitoring lake level changes.In this study,a dataset of lake level changes from 2002 to 2017 for 87 lakes in High Mountain Asia was compiled through lake boundary delineation,water level calculation,outlier removal,Gaussian filtering,and elevation system conversion,and developed based on multi-altimeter data and MODIS images.The dataset includes the daily water level,the monthly and annual average water levels,and annual rate of lake level changes for 87 lakes,and can provide fundamental data for monitoring the dynamic lake changes in High Mountain Asia,studying the climate and environmental changes and managing the water resources in this region.