期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2004
卷号：XXXVI-8/W2
出版社：Copernicus Publications
摘要：An airborne scanning LiDAR (light detection and ranging) survey using a small footprint discrete pulse return Airborne Laser Terrain Mapper (ALTM) was conducted over the Utikuma Boreal wetland area of northern Alberta in August 2002. These data were analysed to quantify systematic LiDAR errors in: a) ground surface elevation; and b) vegetation canopy surface height. Of the vegetation classes, aquatic vegetation was associated with the largest error in LiDAR ground surface definition (+0.15 m, σ = 0.22), likely a result of saturated ground conditions. The largest absolute errors in LiDAR canopy surface height were associated with tall vegetation classes. However, the largest relative errors were associated with low shrub (63%) and aquatic vegetation (54%) classes. The openness and orientation of vegetation foliage was thought to enhance laser pulse canopy surface penetration in these two classes. Raster canopy height models (CHMs) systematically underestimated field validation heights by between 3% (aspens and black spruce) and 64% (aquatic vegetation). It is recommended that robust LiDAR canopy surface height correction methods be investigated that are universally applicable to vegetation classes of all species and heights
