Key message

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.

Context

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.

Aims

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.

Methods

Accuracies of timber volume estimates using models from an existing NFI-based map and a FMI were compared at plot and stand level.

Results

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.

Conclusion

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.

中文翻译：

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基于机载激光扫描的木材量估算-比较国家森林清单和森林管理清单数据的使用

关键信息

基于国家森林清单（NFI）数据和机载激光扫描的大规模森林资源图可促进NFI与森林管理清单（FMI）之间的协同作用。在基于NFI的地图和FMI中使用的模型的比较表明，基于NFI的地图可直接用于FMI中以估计成熟的云杉林的木材量。

语境

传统上，FMI和NFI是分开的活动。详细的基于NFI的森林资源图的可用性不断提高，从而有可能消除或减少FMI中实地样本图测量的需求（如果它们的准确性相似）。

目的

我们的目标是（1）比较基于NFI的地图中使用的木材体积模型和FMI中使用的模型，以及（2）在基于NFI的地图模型中利用其他局部样本图进行评估。

方法

使用现有基于NFI的地图和FMI的模型对木材体积估计的准确性进行了地块和林分级别的比较。

结果

来自基于NFI的地图的估算值与FMI相似，或更准确。将局部图添加到建模数据中并不能明显改善基于NFI的图的模型。

结论

比较结果表明，基于NFI的地图可直接用于FMI中，以评估成熟的云杉林中的木材量，从而可能节省大量成本。