Scale

Hi Thomas Van Damm

  1. Align images
  2. Mark 4 control points (each control point is picked in 4 pictures, they are points on a scale bar)
  3. Create 2 distances between these control points as constraints
  1. ALIGN again to get correct scale etc.

You need to use ALIGN again so that the constants are included in alignment solution, the UPDATE is used when you have set everything properly and need to change the PROJECTION SYSTEM, it is not set for setting proper scale…