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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >A comparison of GPS and lidar salt marsh DEMs
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A comparison of GPS and lidar salt marsh DEMs

机译：GPS和LIDAR Salt Marsh Dems的比较

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摘要

Digital elevation models (DEMs) were compared to characterize how well airborne lidar (light detection and ranging) data depict the microtopography of a salt marsh. 72,000 GPS points and 700,000 lidar points from a 1km2 salt marsh island were linearly interpolated using identical DEM configurations. Overall, 78% of lidar elevations were within ±0.15m of the high precision GPS elevations. Spatial arrangement of difference values reveal that lidar performed best on the marsh platform, and poorly along tidal creeks and creek heads. Also, the overall shape of the salt marsh was poorly defined, even where lidar data were within the reported range of accuracy. These observations indicate that lidar appears to be a robust tool for mapping intertidal landscapes. However, lidar DEMs may not adequately resolve the microtopographic variations of a salt marsh, and for research questions that require accurate depiction of small-scale tidal creek networks and subtle terrain features lidar data should be augmented with other information.
机译：将数字高度模型（DEM）进行了比较，以表征空气传播的激光雷达（光检测和测距）数据描绘了盐沼的微复印件。使用相同的DEM配置，来自1km2盐沼岛的72,000个GPS点和700,000个激光乐点是线性插值。总体而言，高精度GPS高度的78％的激光升降升高位于±0.15米。差异值的空间排列揭示了激光乐队在沼泽平台上表现最佳，沿着潮汐小溪和溪头较差。而且，即使LIDAR数据在报告的准确范围内，盐沼的整体形状也很差。这些观察结果表明，LIDAR似乎是用于映射跨境景观的鲁棒工具。然而，LIDAR DEM可能无法充分解决盐沼的微拷贝变化，并且对于需要对小型潮汐网络的准确描绘的研究问题，并且微妙的地形功能LIDAR数据应该被其他信息增强。

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