Transformations may or may not change Geometrical Relationships

• The taxonomy for classifying mathematical transformations is complex and there are a lot of types:

  • isometric, linear, bi-linear, conformal, orthogonal, affine, isomorphic, ...

• For SEDRIS, two classifications are sufficient for transformations associated with earth referenced coordinate frameworks.

  • Geometry Invariant (GI): that class of transformations between coordinate reference frames that do not distort geometrical relationships.
  • Non-Geometry Invariant (NGI): that class of transformations between coordinate reference frames that distort some geometrical relationships.

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