In order to monitor the growth of cotton in an area (in the northern hemisphere), we acquired QuickBird images taken every month from June to October. The images have been georeferenced and geometrically corrected. If the images have good contrasts and contain no noises, which type of image processing is still needed for the comparison between these images?
A) histogram equalisation
B) spatial filtering
C) bilinear interpolation
D) sun elevation correction

Question

Quizplus · Accepted Answer

Sun elevation correction is necessary because the sun's position changes throughout the year, affecting the illumination of the scene and potentially the appearance of the vegetation in the images. This correction ensures that the images are comparable by adjusting for the differences in sun angle across the months.

In Order to Monitor the Growth of Cotton in an Area