An analysis research of terrain correction methods considering the slope ranges based on OLI image

Abstract

In mountainous terrain, the topographic correction often be used in image pre-processing. Recently, some correction approaches considering slope ranges have been developed to improve topographical effects. The paper explores the C correction and Minnaert methods considering the slope ranges to evaluate if the methods considering slope ranges can effectively reduce the topographic effects. The C model constants and Minnaert constants in different slope range were obtained based on the image samples. Then, the scatterplots were used to evaluate the correction results. The model constants analysis shows that the Minnaert constant has a nonlinear relation with slope. The scatterplots analysis shows that the image reflectance using a single correction constant value has a better correction result. When the slopes are greater than 43 degrees, the Minnaert model considering slope has overcorrected the topographic effects. The study has demonstra-ted the Minnaert correction models considering slope range did not better reduce topographic effects and the method need be improved, especially in the high slope ranges.