CHARACTERISTICS AND CAUSES OF SUSPENDED PARTICULATE MATTER SPECKLES OF THE GEOSTATIONARY OCEAN COLOR IMAGER AND A REMOVAL METHOD

摘要

Speckles in the suspended particulate matter (SPM) data of the Geostationary Ocean Color Imager (GOCI) were spatiotemporally analyzed. The speckles were classified into four types based on their appearance: isolated speckle, speckle near cloud, patch-type speckle, and slot-related speckle. The spectral characteristics of the speckles were analyzed. We developed a speckle removal procedure and applied it to GOCI level 2 SPM data from 2011 to 2016. The speckle removal improved the quality of the GOCI SPM data. We conclude that the speckles were generated by the unmasked clouds edge, water vapor, and small clouds that move during the spectral scanning sequences.