基于机载激光扫描的木材蓄积量估测--国家森林资源清查与森林资源管理清查数据的比较
Timber Volume Estimation Based on Airborne Laser Scanning -- Comparing the Use of National Forest Inventory and Forest Management Inventory Data
摘要：
根据国家森林调查数据和机载激光扫描绘制的大比例尺森林资源图可促进国家森林调查和森林管理调查之间的协同作用。在这样一个基于NFI的地图和森林管理指数中使用的模型的比较表明，基于NFI的地图可以直接用于森林管理指数，以估计成熟的云杉林的木材体积。传统上，金融管理机构和非金融机构是分开的活动。越来越多的以国家森林调查为基础的详细森林资源地图提供了可能性，如果准确性相似，就可以消除或减少在森林管理调查中实地取样测量的需要。我们的目标是1）比较基于NFI的地图中使用的木材蓄积模型和FMI中使用的模型，以及2）评估在基于NFI的地图模型中使用额外的本地样地。木材蓄积量估计使用模型从现有的NFI为基础的地图和FMI的准确性进行了比较，在地块和林分水平。基于NFI的地图的估计值与FMI相似或更准确。在建模数据中加入局部地块并没有明显改善基于NFI的地图的模型，比较表明，基于NFI的地图可以直接用于FMIs中，用于成熟云杉林分的木材蓄积量估计，从而可能节省大量成本。
英文摘要：
Large-scale forest resource maps based on national forest inventory (NFI) data and airborne laser scanning may facilitate synergies between NFIs and forest management inventories (FMIs). A comparison of models used in such a NFI-based map and a FMI indicate that NFI-based maps can directly be used in FMIs to estimate timber volume of mature spruce forests. Traditionally, FMIs and NFIs have been separate activities. The increasing availability of detailed NFI-based forest resource maps provides the possibility to eliminate or reduce the need of field sample plot measurements in FMIs if their accuracy is similar. We aim to 1) compare a timber volume model used in a NFI-based map and models used in a FMI, and 2) evaluate utilizing additional local sample plots in the model of the NFI-based map. Accuracies of timber volume estimates using models from an existing NFI-based map and a FMI were compared at plot and stand level. Estimates from the NFI-based map were similar to or more accurate than the FMI. The addition of local plots to the modeling data did not clearly improve the model of the NFI-based map.The comparison indicates that NFI-based maps can directly be used in FMIs for timber volume estimation in mature spruce stands, leading to potentially large cost savings.
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