A global reference database from very high resolution commercial satellite data and methodology for application to Landsat derived 30 m continuous field tree cover data
A global reference database from very high resolution commercial satellite data and methodology for application to Landsat derived 30 m continuous field tree cover data
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DOI：
10.1016/j.rse.2015.01.018
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发表时间：
2015-08
影响因子：
13.5
通讯作者：
Bruce W. Pengra;Jordan B. Long;D. Dahal;S. Stehman;T. Loveland
中科院分区：
文献类型：
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作者：
Bruce W. Pengra;Jordan B. Long;D. Dahal;S. Stehman;T. Loveland
介绍了利用高分辨率商业卫星数据选择、创建和应用全球遥感验证数据集的方法。获得高分辨率数据的是500个初级采样单元(5千米×10千米样本区块)的分层随机样本，其中基于Köppen气候类别的分层用于在生物群之间全球分布样本。使用分析员中介的分类工作流程，将高分辨率数据分类为分类土地覆盖图。我们最初使用这些数据是为了评估一个全球30米长的陆地卫星衍生的、连续的野外树木覆盖产品。对于这一应用，在2米分辨率下产生的分类参考分类被转换为每30米像素(二次采样单位)的树木覆盖率，以与陆地卫星得出的树木覆盖率估计值进行比较。我们提供了示例结果(基于南美洲25个样本组的子样本)，说明了可以从这些参考数据产生的协议的基本分析。商业高分辨率数据的可用性和数据质量被证明是验证连续野外树木覆盖的一种可行手段。完成后，500幢楼宇样本的参考分类将会公布，供公众使用。
The methodology for selection, creation, and application of a global remote sensing validation dataset using high resolution commercial satellite data is presented. High resolution data are obtained for a stratified random sample of 500 primary sampling units (5 km × 5 km sample blocks), where the stratification based on Köppen climate classes is used to distribute the sample globally among biomes. The high resolution data are classified to categorical land cover maps using an analyst mediated classification workflow. Our initial application of these data is to evaluate a global 30 m Landsat-derived, continuous field tree cover product. For this application, the categorical reference classification produced at 2 m resolution is converted to percent tree cover per 30 m pixel (secondary sampling unit)for comparison to Landsat-derived estimates of tree cover. We provide example results (based on a subsample of 25 sample blocks in South America) illustrating basic analyses of agreement that can be produced from these reference data. Commercial high resolution data availability and data quality are shown to provide a viable means of validating continuous field tree cover. When completed, the reference classifications for the full sample of 500 blocks will be released for public use.