期刊名称：Archiwum Fotogrametrii, Kartografii i Teledetekcji
印刷版ISSN：2083-2214
出版年度：2009
卷号：19
语种：English
出版社：Main Board of Association of Polish Surveyors
摘要：The development of geodata acquiring technology has become very fast in recent years and leads to changes in many areas of economy,also in forestry,where new,revolutionary solutions such as terrestrial laser scanning are being implemented. Measurements of such tree characteristics,as the tree height,DBH,taper and the stem volume are subject of a number of studies. Generated sets of data (point clouds) need a chain of automatic processing. This paper describes the application of TLS in forest inventory control,i.e. in determining several parameters such as basal area (g),height (h) and finally the stem volume (V). The 105 years old pine stand in Milicz Forest District was analysed (plot no. 8). Scanning was performed from 4 stations with the use of a FARO LS 880 laser scanner. Reference data were collected using both the traditional instruments (DBH),and airborne laser scanning (h). Several methods and formulas were tested to calculate the stem volume,i.e. methods based on solid of revolution (involving 3 different pairs of cross-sections: 1.3 /6.0;2.0/5.0 and 2.0/6.0 m above the ground),and sectional measurements. In both methods,the surface area of the crosssections was calculated using the author's algorithm (convex hulls). As the reference,the so-called empirical formula designed for pine was applied,together with volume calculated for 0.5 m sections on TLS point cloud. Traditional methods based on tables with volumes calculated for single trees were also used. The results indicate that volume measurements based on sections do not differ statistically from volumes calculated by means of the empirical formula,while the differences amount to 1.5 % only. As regards the method based on solid of revolution,the differences amount to 6.1% (cross-sections: 2.0/6.0 m,Std. dev 8.0) and 8.4% (2.0/5.0 m) causing the underestimation of the volume. Maximum values,calculated for single trees,are sometimes very high (38.4% for 2.0/5.0 m cross-sections),which indicates geometrical differences in the stem solid. The paper confirmed usability of section measurements within TLS point cloud and the need for further research on defining new standards and parameters for forest inventory control,as well as the necessity of applying automatic algorithms for data processing.
其他摘要：Rozwój technologii pozyskiwania geodanych nabrał w ostatnich latach dużego tempa co skutkuje rewolucyjnymi zmianami w wielu dziedzinach gospodarki,w tym w leśnictwie, gdzie obserwuje się wdrażanie takich rozwiązań jak naziemny skaning laserowy (Terrestria
关键词：TLS;DBH;basal area;volume of tree trunk
其他关键词：naziemny skaning laserowy (TLS);pierśnica (d);pierśnicowe pole przekroju drzewa (g);miąższość pnia (V).
