半个世纪玛旁雍错和拉昂错湖泊面积变化数据集构建(1972‒2023)

Construction of Half-century Dataset of Lake Area Changes in Mapam Yumco and La’ang Co(1972–2023)

本文以Landsat系列和GF1遥感影像为数据源,通过人工目视解译方法,研发了1972‒2023年玛旁雍错和拉昂错的矢量边界数据,并计算了对应的湖泊面积,构成玛旁雍错水域变化数据集(1972‒2023)和拉昂错水域变化数据集(1972‒2023)。两个数据集包括1972、1977、1994、2000‒2023年共27期玛旁雍错和拉昂错的矢量边界和面积数据。数据的空间分辨率为30 m。数据集存储为.shp格式,玛旁雍错和拉昂错均由189个数据文件组成。1972‒2023年玛旁雍错面积呈略微减少趋势,面积在412 km^(2)左右;拉昂错面积呈明显减少趋势,平均速率为‒4.238 km^(2)/10a。玛旁雍错湖面空间变化不明显,东北部与南部水岸线略有变化。拉昂错变化较明显的区域主要集中在北部和西南部。

This paper developed the vector boundary data of Mapam Yumco and La’ang Co through manual visual interpretation from 1972–2023 using the Landsat series and GF1 remote sensing images as data sources.The corresponding lake area was calculated to obtain the Mapam Yumco and La’ang Co change datasets(1972–2023).The two datasets include the vector boundary and area of Mapam Yumco and La’ang Co in 27 periods of 1972,1977,1994,and 2000–2023.The spatial resolution of the data is 30 m.The datasets are archived in the.shp data format,and both Mapam Yumco and La’ang Co are composed of 189 data files.From 1972–2023,the area of Mapam Yumco showed a slightly decreasing trend,with an area of about 412 km^(2).The area of La’ang Co showed a significant decreasing trend,with an average rate of–4.238 km^(2)/10a.The spatial change of the Mapam Yumco Lake surface was not obvious,while the shoreline of the northeast and south of the lake changed slightly.The large changes in La’ang Co were concentrated primarily in the north and southwest.