ANSWERS TO YOUR
TECHNICAL QUESTIONS.
How do I manually add tie points between two images?
To manually add a tie point, you must first create a link between two adjacent images. If the link already exists, you can right-click on the yellow line linking the two images to access the Tie Point Editing window. Using your mouse, you can click in one image and drag to same location to add the point on the other image. Zoom in to refine the position of the point and accept its final location by saving. Tie points, when manually measured, must be identified on each image with the best possible accuracy (at the pixel level).
Note that if there are already existing tie points (visually identifiable as stars), then it is recommended to use these to create new links.