基于IFZ与NDVI的矿区土地利用/覆盖变化研究

Land use and cover change in coal mining area by IFZ and NDVI

  • 摘要: 重建长时间序列的土地利用/覆盖变化(LUCC)的时空规律,可以为定量研究区域或全球生态进程和评价生态系统服务价值提供重要的数据支撑。以阿巴拉契亚地区韦兹县煤田区为例,基于22期Landsat TM/ETM+影像,应用综合森林特征指数(IFZ)和归一化植被指数(NDVI)相结合的遥感时间序列分析方法,重建了1984年以来27 a间该地区具有生态学意义的LUCC动态变化特征。研究识别了持续森林覆盖(PF)、持续其他植被覆盖(POV)、持续无植被覆盖(PNV)、采矿扰动(EM)、其他扰动(OD)等类型土地的空间分布特征。研究结果表明:分类总体精度85.9%,Kappa系数为0.852;PF,POV,PNV,OD和EM面积分别占研究区面积的66.68%,5.15%,0.24%,3.63%和23.67%;伴随开采规模缩减,EM面积增速下降。

     

    Abstract: Reconstruction of temporal and spatial patterns of land use and cover change by long time series data analy- sis can provide an important data support for the quantitative study of ecological processes and the evaluation of eco- system services value at regional or global scale. Taking the Appalachian coalfield segment in Wise County as a study area,based on 22 Landsat TM / ETM + images,the authors reconstructed the dynamic change characteristics of LUCC in 27 years by time-series remote sensing method with both Integrated Forest Z-score (IFZ) and Normalized Difference Vegetation Index (NDVI). Compared to traditional LUCC study,the authors delineated the LUCC types by time-serial trajectory as persisting forest (PF),persisting other vegetation (POV),persisting non-vegetation (PNV),ever mined (EM) and other disturbance ( OD),and analyzed their spatial distribution characteristics. The overall classification accuracy and Kappa coefficient are 85. 9% and 0. 852 respectively. PF,POV,PNV,OD and EM account for 66. 68% , 5. 15% ,0. 24% ,3. 63% and 23. 67% of the study area. With the decrease of coal yield in these years,EM-land growth rate decreased.

     

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