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1. Types of measures
Although there are many different models of terrestrial laser scanners, the basic operating principle is the same for all of them:
a motor for controlled rotation around the instrument's main axis (usually almost vertical);
in parallel, a system of mirrors or prisms rotates about an axis perpendicular to the first ;
a laser pump emits a beam which, using different techniques, provides distance information;
we'll also store the intensity of the return signal.
It is possible to determine the three-dimensional position of the impact of the emitted beam in a reference frame local to the scanner position with the polar information shown in figure
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Types of measures
Some considerations about lasers
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