Abstract
Abstract. Topographic correction of surface reflectance in rugged terrain areas is the prerequisite for the quantitative application of remote sensing in mountainous areas. Physics-based radiative transfer model can be applied to correct the topographic effect and accurately retrieve the reflectance of the slope surface from high quality satellite image such as Landsat8 OLI. However, as more and more images data available from various of sensors, some times we can not get the accurate sensor calibration parameters and atmosphere conditions which are needed in the physics-based topographic correction model. This paper proposed a semi-empirical atmosphere and topographic corrction model for muti-source satellite images without accurate calibration parameters.Based on this model we can get the topographic corrected surface reflectance from DN data, and we tested and verified this model with image data from Chinese satellite HJ and GF. The result shows that the correlation factor was reduced almost 85 % for near infrared bands and the classification overall accuracy of classification increased 14 % after correction for HJ. The reflectance difference of slope face the sun and face away the sun have reduced after correction.
Highlights
Topographic correction of surface reflectance in rugged terrain areas is the prerequisite for the quantitative application of remote sensing in mountainous areas
In rugged terrain areas differences in terrain orientation often create variation in signal values between pixels with similar land cover and biophysical-structural properties as a result of differences in irradiance owing to the angle of incident illumination, and differences in radiance according to the angle of existence(Sandmeier & Itten, 1997; Soenen, Peddle, & Coburn, 2005)
The model to correct mountainous land surface reflectance can be divided into several classes: ratio model, empirical model and physics-based model
Summary
Topographic correction of surface reflectance in rugged terrain areas is the prerequisite for the quantitative application of remote sensing in mountainous areas. Physics-based radiative transfer model can be applied to correct the topographic effect and accurately retrieve the reflectance of the slope surface from high quality satellite image such as Landsat OLI. This paper proposed a semi-empirical atmosphere and topographic correction model for multi-source satellite images without accurate calibration parameters. Based on this model we can get the topographic corrected surface reflectance from DN data, and we tested and verified this model with image data from Chinese satellite HJ and GF. This paper proposed a semi-empirical model to do topographic correction for multi-source image in mountain areas and test the model with Chinese satellite, GF and HJ
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