Linear and non-linear enhancement for sun glint reduction in advanced very high resolution radiometer (AVHRR) image

8th International Symposium of the Digital Earth

地球科学;计算机科学

Roslan, N.^1,2 ; Reba, M.N.M.^1,2 ; Askari, M.^3 ; Halim, M.K.A.^3

Faculty of Geoinformation and Real Estate, Malaysia^1

Institute for Science and Technology Geospatial (INSTEG), Malaysia^2

Institute of Water Resource Management (IPASA), Faculty of Civil Engineering, Universiti Teknologi Malaysia, Johor 81310, Malaysia^3

关键词: Band ratios;    Cloud classification;    Cloud detection;    Feature detection;    Mixed pixel;    Over water;    Sobel edge detection;    Visible wavelengths;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/18/1/012041/pdf
DOI  :  10.1088/1755-1315/18/1/012041

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Cloud detection over water surfaces is difficult due to the sun glint effect. The mixed pixels between both features may introduce inaccurate cloud classification. This problem generally occurs because of less contrast between the glint and the cloud. Both features have almost the same reflectance in the visible wavelength. The piecewise contrast stretch technique shows preservation capability on the reflectance of the cloud. The result of a band ratio was smoothed by applying the Sobel edge detection to provide better cloud feature detection. The study achieved an accuracy of about 77.5% in cloud pixels detection.