Development of Landsat-based annual US forest disturbance history maps (1986–2010) in support of the North American Carbon Program (NACP)
Development of Landsat-based annual US forest disturbance history maps (1986–2010) in support of the North American Carbon Program (NACP)
复制标题
开发基于陆地卫星的年度美国森林扰动历史地图（1986-2010）以支持北美碳计划（NACP）
DOI：
10.1016/j.rse.2018.02.035
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发表时间：
2018
影响因子：
13.5
通讯作者：
A. Michaelis
中科院分区：
文献类型：
--
作者：
F. Zhao;Chengquan Huang;S. Goward;K. Schleeweis;K. Rishmawi;Mary A. Lindsey;Elaine Denning;Louis Keddell;W. Cohen;Zhiqiang Yang;J. Dungan;A. Michaelis
在北美森林动力学（NAFD）研究的第三阶段，开发了一个利用陆地卫星观测来评估森林扰动历史的自动工作流程。它有四个主要组成部分：用于图像选择和预处理的自动化方法，植被变化跟踪器（VCT）森林干扰分析，后处理和验证。该方法已应用于美国（CONUS），利用NASA地球交换（NEX）云计算系统对美国森林干扰历史进行全面分析。由此产生的NAFD-NEX产品包括1986-2010年的25张年度森林扰动图和两张时间集成图，以提供这一时期扰动的时空天气视图。这些地图是基于从35万多张分辨率为30米的可用Landsat图像中选择的2.4万多幅场景而得出的，并通过对Landsat时间序列图像的视觉评估，结合高分辨率和其他辅助数据源，通过基于概率的抽样方法选择样本进行验证。验证显示NAFD-NEX图中对于导致至少20%冠层覆盖损失的干扰事件没有重大偏差。用户和生产者对干扰类别的平均准确度分别为53.6%和53.3%，在25年期间，单个年份的用户准确度从42.8%到73.6%不等，生产者准确度从39.0%到84.8%不等。NAFD-NEX扰动图可从橡树岭国家实验室分布式活动档案中心（ORNL-DAAC）的门户网站https://doi.org/10.3334/ORNLDAAC/1290获得。
In Phase III of the North American Forest Dynamics (NAFD) study an automatic workflow has been developed for evaluating forest disturbance history using Landsat observations. It has four major components: an automated approach for image selection and preprocessing, the vegetation change tracker (VCT) forest disturbance analysis, postprocessing, and validation. This approach has been applied to the conterminous US (CONUS) to produce a comprehensive analysis of US forest disturbance history using the NASA Earth Exchange (NEX) cloud computing system. The resultant NAFD-NEX product includes 25 annual forest disturbance maps for 1986–2010 and two time-integrated maps to provide spatial-temporal synoptic view of disturbances over this time period. These maps were derived based on 24,000+ scenes selected from 350,000+ available Landsat images at 30-m resolution, and were validated using a visual assessment of Landsat time-series images in combination with high-resolution and other ancillary data sources over samples selected using a probability based sampling method. The validation revealed no major biases in the NAFD-NEX maps for disturbance events that resulted in at least 20% canopy cover loss. The average user's and producer's accuracies for the disturbance class were 53.6% and 53.3%, respectively, with the individual year's user's accuracy varying from 42.8% to 73.6% and producer's accuracy from 39.0% to 84.8% over the 25-year period. The NAFD-NEX disturbance maps are available from a web portal of the Oak Ridge National Laboratory Distributed Active Archive Center (ORNL-DAAC) at https://doi.org/10.3334/ORNLDAAC/1290.