1. A computer executable method of orthoimage color correction using multiple aerial images, comprising steps of: (a) processing a global color correction by using a plurality of aerial images coordinated with digital elevation models (DEMs), wherein a gray value statistic is obtained for each of said aerial images individually and then a plurality of orthoimages or true-orthoimages is processed through a global color correction according to said plurality of aerial images and said corresponding gray value statistics; (b) processing a local color correction to seam lines between said plurality of orthoimages or true-orthoimages; and (c) outputting a result from the computer.