基于线性校正的环塔里木盆地1990-2021年地表反照率时空数据集  

A dataset of spatial-temporal surface albedo in the Ring Tarim Basin based on linear correction from 1990 to 2021

作　　者：席磊 戚曌 曹晓明[1,2,3] 崔梦淳 丁杰 冯世昂 冯益明 XI Lei;QI Zhao;CAO Xiaoming;CUI Mengchun;DING Jie;FENG Shiang;FENG Yiming(Institute of Ecological Protection and Restoration,Chinese Academy of Forestry,Beijing 100091,P.R.China;Institute of Desertification Studies,Chinese Academy of Forestry,Beijing 100091,P.R.China;Key Laboratory of State Forestry and Grassland Administration on Desert Ecosystem and Global Change,Beijing 100091,P.R.China;College of Computer Science and Electronic Engineering,Hunan University,Changsha 410082,P.R.China)

机构地区：[1]中国林业科学研究院生态保护与修复研究所,北京100091 [2]中国林业科学研究院荒漠化研究所,北京100091 [3]荒漠生态系统与全球变化国家林业和草原局重点实验室,北京100091 [4]湖南大学,信息科学与工程学院,长沙410082

出　　处：《中国科学数据（中英文网络版）》2024年第4期417-426,共10页China Scientific Data

基　　金：第三次新疆综合科学考察课题(2021xjkk0304);国家林业和草原科学数据中心荒漠分中心(2005DKA32200)。

摘　　要：塔里木盆地是生态极端脆弱区,更是人为扰动剧烈区,荒漠化问题尤为突出。地表反照率(Albedo)在研究区域尺度的荒漠化现状、气候变化以及生态系统风险评估等方面具有重要意义。本研究借助谷歌地球引擎(Google Earth Engine,GEE)云平台,以环塔里木盆地为研究区,以植被生长季(4-10月)的Landsat系列卫星影像为数据源,通过反演获取了环塔里木盆地1990-2021年间7期Albedo时空数据集。本研究基于实际测量获得的132块样地的反照率数据,以100块样地建立基于线性回归的校正系数表达式(y=0.97634 x+0.0034565),并对反演出的反照率时空数据集进行校正。以32块样地作为独立样本验证数据集精度,校正前的数据集精度为:R^(2)=0.644;校正后的数据集精度为:R^(2)=0.723。本数据集可为干旱区荒漠化监测、土地利用类型变化和生态环境演变等方面的研究提供数据支撑。The Tarim Basin is an extremely ecologically fragile area,characterized by significant environmental vulnerability and intense human activity.Desertification is a particularly pressing problem in this area.Albedo is of great significance in studying desertification status,climate change and ecosystem risk assessment on a regional scale.With the help of Google Earth Engine(GEE)cloud platform,this study focuses on the Tarim Basin as the research area,with Landsat series satellite images from the vegetation season(April to October)serving as the data sources,resulting in a dataset of spatial-temporal surface albedo in the Ring Tarim Basin based on linear correction from 1990 to 2021(7 periods).Based on the Albedo data of 132 sample plots obtained through actual measurements,we derived a correction coefficient equation based on linear regression(y=0.97634 x+0.0034565)using 100 sample plots,which was then applied to correct the inverted Albedo spatio-temporal dataset.The dataset accuracy is verified using 32 blocks of sample plots as independent samples.The dataset accuracy before correction is R^(2)=0.644;while the corrected dataset achieves an accuracy of R^(2)=0.723.This dataset can provide data support for research in desertification monitoring,land use type changes and ecological environment evolution in arid areas.

关 键 词：环塔里木盆地 地表反照率 校正系数 线性回归 1990-2021 

分 类 号：P416[天文地球—大气科学及气象学]