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：Models based on laser height metrics matching different quantiles of the distribution of laser canopy heights should be similar to one another with respect to their predictive capabilities of aboveground biomass providing: 1) the allometric relationships in the trees studied remain consistent; and 2) the vertical distributions of laser canopy heights and needle area/mass are related according to a simple quantile-quantile relationship. To explore the use of canopy-based quantile estimators in an application of aboveground biomass estimation in Douglas-fir, models based on laser height metrics corresponding to deciles of the distribution of laser canopy heights are compared. Because robust allometric equations were not available, the influence of using two different sets of allometric equations (referred to as BAR and TER equations) on model results is examined. The coefficient of determination (r 2 ) of decile models in the BAR and TER groups ranged from 0.25 to 0.43 and 0.34 to 0.50, respectively, whereas the root-mean-square error (RMSE) ranged from 29 to 34 and 32 to 36 Mg/ha, respectively. The greatest difference in RMSE between models was less than 5 Mg/ha. Decile models for each of the BAR and TER groups were not overtly different from one another
