基于Google Earth Engine的云南省1999-2018年植被覆盖度变化分析  

Analysis of Vegetation Coverage Change in Yunnan Province from 1999—2018 based on Google Earth Engine

作　　者：谷雷 岳彩荣 赵勋 徐海峰 GU Lei;YUE Cai-rong;ZHAO Xun;XU Hai-feng(College of Forestry,Southwest Forestry University,Kunming Yunnan 650224,P.R.China;College of Big Data and Intelligent Engineering,Southwest Forestry University,Kunming Yunnan 650224,P.R.China)

机构地区：[1]西南林业大学林学院,云南昆明650224 [2]西南林业大学大数据与智能工程学院,云南昆明650224

出　　处：《西部林业科学》2020年第5期74-80,共7页Journal of West China Forestry Science

基　　金：亚太森林网络(APFNET/2018P1-CAF);云南省教育厅项目(2018JS330);国家自然基金(31260156)。

摘　　要：本研究基于谷歌地球引擎(Google Earth Engine,GEE)的云平台数据和计算资源,利用8322景的Landsat TM/ETM+/OLI遥感影像,计算每一景影像的NDVI值,并合成其年度最大NDVI值;采用像元二分法估算植被覆盖度;采用T检验方法分析1999—2018年间云南省植被覆盖度变化趋势。研究表明:(1)1999—2018年,云南省近20年的植被覆盖度总体良好。从整体看,植被覆盖状况以高覆盖度和中高覆盖度为主,二者面积之和每年均达云南省总面积的64%以上,而各年度低覆盖度与中低覆盖度区域的面积均未超过总面积的10%。在空间分布上呈现由西南向北、向东减少的特征。(2)近20年云南省植被覆盖度变化趋势呈现基本不变、轻微改善的特征。其中,基本不变面积占82.52%,明显改善面积占0.31%,轻微改善面积占8.74%,严重退化面积占0.17%,轻微退化面积占8.26%。(3)GEE云平台在大尺度和海量数据处理上,体现出了强大优势,整个云南省近20年的植被覆盖度定量可在3 min之内完成。Based on the cloud platform data and computing resources of Google Earth Engine(GEE),8322 Landsat TM/ETM+/OLI remote sensing images were used in this study to calculate the NDVI value of each scene image,and the annual maximum NDVI value was combined.The pixel dichotomy was used to estimate the vegetation coverage,and T test was used to analyze the change trend of vegetation coverage in Yunnan province from 1999 to 2018.The research showed that:(1)From 1999 to 2018,the vegetation coverage of Yunnan province in the past 20 years is generally good.On the whole,the vegetation cover is mainly high coverage and medium-to-high coverage,and the sum of the two areas is more than 64%of the total area of Yunnan province every year.The area of low and medium-low coverage areas in each year does not exceed 10%of the total area.In the spatial distribution,it presents the characteristics of decreasing from southwest to north and from southwest to east;(2)The change trend of vegetation coverage in Yunnan province in recent 20 years is basically unchanged and slightly improved.The unchanged area accounts for 82.52%,the significantly improved area accounts for 0.31%,the slightly improved area accounts for 8.74%,the severely degraded area accounts for 0.17%,and the slightly degraded area accounts for 8.26%;(3)The GEE cloud platform shows strong advantages in large scale and mass data processing,and the quantitative estimation of vegetation coverage in the whole Yunnan province in the past 20 years could be completed within three minutes.

关 键 词：谷歌地球引擎 植被覆盖度 像元二分法 云南省 

分 类 号：Q948[生物学—植物学] TP79[自动化与计算机技术—检测技术与自动化装置]