Coordinate transformations - Project change

3 important questions on Coordinate transformations - Project change

How works the map projection change?

The projection equations are used to transform data from one map projection to another.
First inverse equations: map coordinates to geographic coordinates
Than forward equations: geographic coordinates to map coordinates of the target projection

How does the datum transformation works?

Use 3 different coordinates
Inverse: takes you to the reference surface
Forward: brings you back to the coordinate system
Datum: from one datum system to another

What is a Root Mean Square Error (RSME)?

RMSE is the average deviation of all the measured positions from their true positions.

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