Abstract:

Dividing sub-compartment and interpreting its basic inventory attributes indoors is the goal of forest resource investigators for a long time.In this paper,we study the characteristics of main tree species (group)in sub-tropic region on the aero digital orthophoto map,and then present a decision tree for aero image interpretation of tree species or tree species group.With the support of GIS software,the sub-compartment is divided by screen vectorization and the dominant tree species (group)is determined by visual interpretation.The result indicat that the average area error of sub-compartment is 0.5% and the spatial position overlap rate is 99.7%,which are significantly higher than the conventional method.The total positive precision of image interpretation for dominant tree species (group)is 97.5% and the kappa coefficient is 0.959 8.The paper confirm that the field work of sub-compartment division and basic inventory attributes investigation could be replaced mostly by the application of aero photography,which lays a solid foundation for accurate,rapid and efficient investigation and monitoring of forest resources.

Key words: forest management inventory, sub-compartment, aero digital orthophoto map, image interpretation