In traditional methods geometrical quantity is measured by using spatial reference quantity, and the relationship between measured quantity and reference quantity is space-to-space.
The information entropy of measured quantity and measuring result, and the error entropy are defined.
Errors are inevitable in all the stationary and dynamic measuring process which prevents us to get the real value of the measured quantity directly.
It is a parameter, associated with the result of a measurement (eg a calibration or test) that defines the range of the values that could reasonably be attributed to the measured quantity.
