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1. IntroductionrnAs an important resource, forests not only provide irreplaceable economic benefits, but also yield ecological benefits that maintain the balance of terrestrial ecosystems. In addition, forests are an energy base of the biosphere. With the development of informa-tion-based technologies and globalization, accurate information regarding individual trees and standing forests in forest resource investigations is increasingly needed in order to achieve sustain-able development of forestry [1–6].