Abstract:

In this paper, by means of the principles of LS estimation and ridge estimation, using the rule of residual mean squares(RMS_q), the main information that effect the estimation of forest canopy density is screened out from the RS and GIS information of the ground sample plots through computer simulation. Then, based on the analysis of possible limitation of LS estimation, the ridge estimation is put forward to establish the equation of canopy density estimation. The practical example indicates that when there are some multi-collinearities between the RS and GIS information that effect canopy density estimation, ridge estimation is prior to LS estimation.

Key words: Canopy density, Variance inflation factor, RMS_q, Ridge estimate, Multi-collinearity