Study on the Methods of Precision Calculation of Major Forest Resources Indexes in the Forest and Grassland Comprehensive Monitoring
The precision of the major forest resources indexes in the comprehensive monitoring of forest and grassland has always attracted much attention.According to the demand orientation,the methods for estimating the precision of major forest resource indexes were studied,the specific algorithms for calculating sampling er-rors of ten main forest stock indexes were proposed,and the estimation errors of three main area indexes were also discussed.The results were as follows:The joint estimation method based on regression sampling theory can be used as the basic method for producing statistic results during the transition period;different weight as-signment alternatives have little effect on sampling accuracy in joint estimation,so the simplest equal-weight es-timation can be considered;the specific algorithms for calculating sampling accuracy of ten main forest stock in-dexes based on the correlation between the indexes,are feasible in the application of forest and grassland com-prehensive monitoring;the precision of forest area,natural forest area and planted artificial forest area can also be approximately estimated,based on the error propagation law,by combining the errors of total volume and volume per unit area.
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