2015 Vegetation Height Model NFI

A national vegetation height model was calculated for Switzerland using digital aerial images. We used the stereo aerial images acquired by the Federal Office of Topography swisstopo using the ADS80 sensor to first calculate a digital surface model (DSM) with a very high spatial resolution (1 × 1 m). The DSM was then normalized to obtain the actual vegetation heights using a digital terrain model (DTM) based on laser data with the buildings masked out, and to produce a vegetation height model (VHM). Such a model will be calculated in the framework of the Swiss National Forest Inventory (NFI) with consistent methods and a very high level of detail. For covering the whole of Switzerland, we use summer aerial images from six years.

本研究基于数码航空影像构建了瑞士全国植被高度模型。我们采用瑞士联邦地形局（swisstopo）利用ADS80传感器获取的立体航空影像，首先计算得到空间分辨率高达1×1米的超高分辨率数字表面模型（digital surface model, DSM）。随后，基于搭载激光数据且已掩膜去除建筑物的数字地形模型（digital terrain model, DTM）对DSM进行归一化处理，以获取真实植被高度，并生成植被高度模型（vegetation height model, VHM）。该模型将在瑞士国家森林清查（Swiss National Forest Inventory, NFI）框架内采用统一方法构建，具备极高细节精度。为覆盖瑞士全境，我们使用了六年夏季的航空影像。