LAI Measuring Data Processing,Analysis and Spatial Scaling in the Middle Reaches of Heihe Experimental Research Region

Watershed Allied Telemetry Experimental Research was hold in Heihe experimental research region in the summer of 2008.During that period,a number of ground LAI measurements and remote sensing LAI products were collected.When validating remote sensing LAI products with ground measurements or matching of LAI products derived from different resolution remote sensing images,scaling issue caused by surface heterogeneity cannot be ignored.So different measured and estimated LAI data can't be directly compared to each other without spatial scaling.In this paper,we developed a spatial scaling method based on Taylor series expansion model.This study mainly included two parts.① Setting high-resolution image as auxiliary data,ground LAI measurements were converted into middle-resolution and low-resolution.② LAI products of low-resolution were scale transferred with high-resolution image as sub-pixel information.based on these results,we find that,scaling method based on Taylor series expansion model is simple and effective.After spatial scaling process,the ground LAI measurements can be consider as reference to validate estimated LAI from remote sensing data.