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首页> 外文期刊>Geophysical Research Letters >A global forest canopy height map from the moderate resolution imaging spectroradiometer and the geoscience laser altimeter system
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A global forest canopy height map from the moderate resolution imaging spectroradiometer and the geoscience laser altimeter system

机译:来自中分辨率成像光谱仪和地球科学激光高度计系统的全球森林冠层高度图

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The value of lidar derives from its ability to map ecosystem vertical structure which can be used to estimate aboveground carbon storage. Spaceborne lidar sensors collect data along transects and gain value for the global change science community when combined with data sources that have complete horizontal coverage. Data sources and methods for this type of analysis require evaluation. In this work we use image segmentation of 500 m Moderate Resolution Imaging Spectroradiometer (MODIS) data to produce a global map of 4.4 million forest patches. Where a Geoscience Laser Altimeter System (GLAS) transect intersects a patch, its height is calculated from the GLAS observations directly. Regression analysis is then used to estimate the heights of those patches without GLAS observations. Regression goodness-of-fit statistics indicate moderately strong relationships for predicting the 90th percentile patch height, with a mean RMSE of 5.9 m and mean correlation (R~2) of 0.67.
机译:激光雷达的价值来自其绘制生态系统垂直结构的能力,可用于估算地上碳的存储量。星载激光雷达传感器沿横断面收集数据,并与具有完整水平覆盖范围的数据源结合起来,为全球变化科学界获取价值。此类分析的数据源和方法需要评估。在这项工作中,我们使用500 m中分辨率成像光谱仪(MODIS)数据的图像分割来生成440万片森林斑块的全球地图。在地球科学激光测高仪系统(GLAS)横断面与斑块相交的地方,其高度直接根据GLAS观测值计算得出。然后使用回归分析来估计那些没有GLAS观测值的斑块的高度。回归拟合优度统计数据表明,预测第90个百分位数斑块高度具有中等强度的关系,平均均方误差(RMSE)为5.9 m,平均相关性(R〜2)为0.67。

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