期刊名称：Archiwum Fotogrametrii, Kartografii i Teledetekcji
印刷版ISSN：2083-2214
出版年度：2008
卷号：18
语种：English
出版社：Main Board of Association of Polish Surveyors
摘要：The paper describes the most recent development in using the airborne laser scanning technology (ALS;LiDAR) to determine heights of individual trees and tree stands and compares the results to data derived from the traditional forest inventory. The Piasek Forest of 6,380.26 ha (the Chojna forest district managed by the Regional State Forest Administration in Szczeci) was chosen as a test site. The first reference data set for the forest stand height was obtained from the SILP data base (LAS tables) updated a year (2005) before the ALS was performed. The other reference data set (called TERRAIN) was assembled during the ground-truthing campaign in 2006, which resulted in establishing 276 circular inventory plots (148 plots in 67 deciduous stands and 128 plots in 66 coniferous forest stands). The nDSM (90th percentile) was selected as the input data for the height analysis. The results showed that the ALS-based tree heights were higher than those recorded in the official SILP database for the Chojna district. In the deciduous forest stand, differences between the LiDAR and SILP data were not particularly large and amounted to as little as about 1.07 m (R2 = 0.92). Differences between the LIDAR and TERRAIN data sets were about 1.72 m (R2 =0.77),higher values being obtained using ALS. In the coniferous stands,differences between the LIDAR and SILP were considerably higher,up to +3.58 m (R2 = 0.93),whereas the other TERRAIN set,when compared to the LIDAR data,showed that the traditional forest inventory underestimated the Scots pine height by about -3.01 m. A detailed analyses revealed that,in some inventory plots,the LIDAR data underestimated the tree stand height (LIDAR vs SILP;coniferous: -0.02m;deciduous: -0.41 m). Such underestimation may be explained by the lack of signals coming back from warming tops of the trees. The results obtained allow to conclude that the LIDAR technology supported by the digital orthophotomaps can objectively and precisely supply height data not only for single trees,but it makes it possible to measure the whole stand (whole trees). Therefore,the existing inventory methods need to be changed to make forest planning and monitoring more precise,faster,comparable,cheaper,and not dependable on subjective measurements.
其他摘要：Praca omawia nowe moĪliwoĞci okreĞlania wysokoĞci drzew i drzewostanów w oparciu o techniki lotniczego skaningu laserowego (LiDAR) porównując uzyskane wyniki do tradycyjnych metod inwentaryzacji lasu. Obiekt badawczy stanowiá ObrĊb Piasek (NadleĞnictwo Ch
关键词：airborne laser scanning (ALS);tree and stand height;inventory plots
其他关键词：lotniczy skaning laserowy (ALS);wysokoĞü drzew i drzewostanów; powierzchnie próbne
