The ``Hardcopy Map on Digitizing Table'' correction process is used to tie down an uncorrected image to a georeferenced map mounted on a digitizing table or tablet. Corresponding points are selected on the uncorrected image on screen, and on the digitizing table.
The ``Vectors'' correction process is used to tie down an uncorrected image to a set of georeferenced vectors of the same area. Additionally, a backdrop set of imagery may be selected and displayed in the georeferenced image windows.
The ``User Entered Coordinates'' process is used to assign known locations to features in the uncorrected image. This is done by selecting a point on the uncorrected image, and typing in the georeferenced location of that feature.
The ``Chip Database'' process is used to tie down an uncorrected image to a set of 1-GCP image chips. See the Appendix for more details on the Chip Database.