【摘要】 基于MODIS传感器在2000—2006年观测的MOD13A1影像产品,对东北亚森林的覆盖变化进行了专题分析和制图。一方面,通过生长季节的累加归一化植被指数GNDVI和成对双样本T检验方法,在像素尺度上反映发生变化的强度和显著性特征;另一方面,对地物交错区域的边缘条带进行缓冲区判读分析,去除由于多期影像配准位移所导致的错误判断。然后,利用TM/ETM+影像得到的森林变化图对上述的森林变化检测结果在两个核心区域进行了比较验证。在MOD13A1像素内面积变化5ha以上,且3×3窗口的空间配准尺度下,两区域的森林变化制图精度分别达到了80.24%和88.73%。更多还原

【Abstract】 MOD13A1 products observed by MODIS sensor during the years from 2000 to 2006 were used to map forest dynamic changes in the Northeastern Asia,The mapping analysis was based on the trajectory of multi-year-series normalized difference vegetation index(NDVI) and its spatial morphologic characteristics.The intensity of the changes for a detected forest pixel was characterized by the degradation of the GNDVI and the statistical significance of the changes was determined by a T-test of paired-samples.The false identification of the changes in the transition areas between different vegetation types,which was mainly caused by the mis-registration of the multi-temporal MOD13A1 data,was detected by spatial morphologic analysis and eliminated from final change map.The results from MOD13A1 data were compared with forest change maps derived from TM /ETM+ images in two local regions.The accuracies were 80.24% and 88.73%,at 5 ha and 3 × 3 window level,respectively.更多还原