When your project is ready to produce orthorectified images, you can run the Orthorectification ADS module. This module geometrically corrects image scenes. With orthorectification, you can relate features in the image to their actual locations on Earth, take measurements, and make accurate decisions. Orthorectified images are necessary to produce an image mosaic.
After you have orthorectified your aerial imagery, it is advantageous to perform an accuracy assessment. In CATALYST Enterprise, you run the Automatic Accuracy Assessment module to perform an accuracy assessment of the orthorectified images. The module assesses the absolute accuracy of the orthorectified images to a geocoded reference image, and assesses the relative accuracy of all the orthorectified images in the project.