To use the following commands, it is important to ascertain the following concepts:
-Marks: this is the name given to those blocks inserted with the command Create Marks and they are used to indicate the support points in an image.
-Links: this is the name given to the line which joins a Mark to an MDT Point by means of the command Create links of marks to points and they will be used to pair the support points of the images with the field points when Georeferencing or Deforming an image.
-Reference lines: the concept is similar to that of the Link, but simpler as it does not require Marks or MDT Points, only designating on the screen an origin and a destination. They are created with the command Create reference lines.
Using Links or Reference lines will depend on the user’s likes and requirements, but both may be used either together or separately to calculate the Georeference or Deformation of an image.
TcpMDT