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首页> 外文期刊>Journal of Geographic Information System >LiDAR-Derived DEM and Raw Height Comparisons along Profile Corridor Gradients within a Forest
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LiDAR-Derived DEM and Raw Height Comparisons along Profile Corridor Gradients within a Forest

机译：LiDAR得出的DEM和原始高度在森林中沿轮廓走廊坡度的比较

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We compared field based and airborne LiDAR-derived profile corridor measurements across forest canopy types and terrain ranging from 37% to 49% slope. Both LiDAR-derived DEM and raw LiDAR point elevations were compared to field data. Primary objectives included examining whether canopy type or terrain slope influenced LiDAR-derived profile measurements. A secondary objective included comparing cable logging payloads based on field measured profile elevations to payloads based on LiDAR-derived elevations. Average RMSE elevation errors were slightly lower for profile point to LiDAR DEM values (0.43 m) than profile point to nearest LiDAR elevation point (0.49 m) with differences being larger when sites within forest clearings were removed from analysis. No statistically significant relationship existed between field measured ground slopes and associated profile point and LiDAR DEM elevation differences but a mild correlation existed when LiDAR raw point elevation differences were compared. Our payload analysis determined the limiting payload distance and had consistent results across study sites. The DEM-based profile outperformed the nearest point profile by 5% on average. Results suggest that forest analysts should consider using the nearest LiDAR DEM value rather than the nearest LiDAR point elevation for terrain heights at discrete locations, particularly when forest canopy occludes locations of interest.
机译：我们比较了森林冠层类型和坡度范围为37％至49％的基于野外和机载LiDAR的剖面走廊测量结果。 LiDAR派生的DEM和原始LiDAR点高程都与现场数据进行了比较。主要目标包括检查机盖类型或地形坡度是否影响了LiDAR派生的轮廓测量。第二个目标是将基于现场测得的剖面高程的电缆测井有效载荷与基于LiDAR得出的高程的有效载荷进行比较。到LiDAR DEM值的轮廓点（0.43 m）的平均RMSE海拔误差比到最近的LiDAR海拔点的轮廓点（0.49 m）的平均RMSE误差稍低，当从分析中移除林间空地时，差异更大。实地测得的地面坡度和相关的轮廓点与LiDAR DEM高程差之间不存在统计学上的显着关系，但是当比较LiDAR原始点高程差时，存在轻度相关。我们的有效载荷分析确定了有限的有效载荷距离，并在各个研究站点之间取得了一致的结果。基于DEM的轮廓平均优于最近的点轮廓5％。结果表明，对于分立位置的地形高度，森林分析人员应考虑使用最近的LiDAR DEM值而不是最近的LiDAR点高程，尤其是当森林树冠遮挡了感兴趣的位置时。

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