2000-2014年中国西北地区面积≥10 km2主要湖泊边界数据集

A dataset of main lakes in northwest China with an area above 10 km2(2000–2014)

中国西北地区深居内陆,气候干旱,湖泊面积变化可在一定程度上反映区域水资源时空分配变化特征。本数据集在综合分析降水数据并结合Landsat系列卫星影像实际覆盖情况确定解译时间的基础上,参考“中国2005–2006年1∶25万面积1.0 km2以上湖泊数据集”,选取西北地区113个面积在10 km2以上的非干盐湖,采用人工目视解译方法提取该区域2000–2014年共15期湖泊边界矢量数据。参照科技部科技基础性工作专项“中国湖泊水质、水量与生物资源调查”确定的湖泊范围人工目视解译原则,解译精度控制在一个像元以内。本数据集包括中国西北地区范围矢量数据、2000–2014年湖泊边界矢量数据、湖泊点位及面积统计矢量文件3部分,基本反映了2000–2014年中国西北地区湖泊边界变化情况,可作为其湖泊时空变化、气候变化以及地区水资源人工干预等研究的基础数据。

Deeply inland,northwest China has a dry climate.Variations of lake area can reflect the temporal and spatial distribution of regional water resources to a certain extent.This data set is based on a comprehensive analysis of meteorological data and the actual coverage of Landsat satellite images to determine the interpretation time.Referring to“A 1:250000 data set of lakes with an area above 1km2 in China(2005-2006)”,the study selected 113 non-dry salt lakes with an area above 10 km2 as vectorization objects,all of which are in natural conditions.The lake boundary vector data of 15 periods from 2000 to 2014 were extracted by using artificial visual interpretation.Abiding by the principle of artificial visual interpretation of lake area stipulated by the Ministry of Science and Technology,we controlled the accuracy of interpretation within one pixel.The data set includes three parts of data:(1)regional boundary vector data of northwest China;(2)lake boundary vector data from 2000 to 2014,and(3)lake location and area statistics vector data.The data set basically reflects the change in lake boundaries in northwest China from 2000 to 2014,which can be used as basic data for research on temporal and spatial changes of lakes in the region,climate change,and human intervention in regional water resources.