site search by freefind

follow me


Transformations coordinate operation
Transformations describe a mapping between two coordinate systems. Moslty, both coordinate systems have the same type. Transformation parameters are determined a posteriori by measurements and have an accuracy.
Transformations have geometric conditions like:
  • straights are mapped to straights
  • conformity (e.g. Helmert- transformation)
Often transformation methods are chosen based on the conditions on the geometric properties.
When applying transformations to coordinate reference systems, in the most cases the datum changes.