Methodology of land surface broadband albedo retrieval in the desertification area based on MODIS image data

摘要

To acquire land surface albedo under the condition of a small quantity of field data and calibration data, on the basis of the MODIS remote sensing image data in Xinjiang area and the spectroscopic land surface data simultaneously observed in the field, multiple linear regression equation involving the measured broadband albedo and narrow-band albedo of MODIS image data in the same time interval and mathematical model have been established, so as to realize the remote sensing retrieval from narrow band to broad band, on the premise that there exists a linear relationship between narrow-band albedo and broadband albedo. Moreover, measurement verification is conducted for the land surface albedo in the desertification area of Xinjiang using the regression model; through the statistical analysis, the result proves that this method is easy, feasible and highly precise.