Abstract:

The paper pointed out that crown “bright dots" constitute of image were prerequisite to test crown width, supported by plentyly of aerial photo crown width x and ground tree diameter y， and then demonstrated the intercept linear relation between aerial photo crown width x and ground tree diameter y . As random disturbance of tree crown density, crown width x and ground tree diameter y were dissatisfied equal variance. It was necessary to introduce random effect parameter based on original parameter linear model. The paper let “plot" as random effect structure parameter,“tree crown type" as group variable, their cross product as “random effect" parameter design matrix.Aerial photo crown width x and ground tree diameter y linear mixed model were constructed and optimization unbias estimation.Linear mixed model Rwas 0.72, and general linear model R was 0.57 The essence of linear mixed model was fixed parameters equation add random disturbance. Random disturbance forecast equation parameters with were independent on aerial photo scale as standardized data．

Key words: crown width, linear mixed model, optimization unbias estimation, random disturbance estimation equation