Polynomial Trend Surface Analysis Applied to AVHRR Images to Improve Definitionof Arctic Leads

摘要

Polynomial trend surface analysis was applied to three AVHRR images to determinewhether regional trends in image radiance can be removed with this procedure. Results suggest that trend surface techniques can be effective in removing region-scale variation in image radiances that are related to uneven illumination, intermittent cloud cover, and variation in the surface temperature field. The dominant effects of illumination in Channel 2 (visible) data caused by variable sun angle and proximity of the scene to the terminator, can be minimized by