3D scan

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UTC

Coordinated Universal Time is the primary time standard by which the world regulates clocks and time.

 

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Time stamp

After data is processed (within the scanner) the "time stamp" attribute is assigned to each point of the point cloud giving precise information on the emission time of the laser pulse, i.e., the time the range to the target has been measured. Assuming the time information of a GNSS receiver has been provided to the laser scanner (PPS signal and time info datagram), the time stamp is in the domain established by the GNSS receiver, usually UTC or GPS time.

 

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Scan mechanism

The scan mechanism consists of a fast rotating polygon mirror and a slower rotating optical head. The rotating mirror deflects the laser beam into different directions whereas optical head rotates slowly to cover the full circle of 360 degree. The optical head carries and moves the whole line scan mechanism.

 

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Reflectance

Reflectance is a target property. Refers to the optical power that is reflected by that target at a certain wavelength. The reflectance provided is a ratio of the actual, optical amplitude of that target to the amplitude of a diffuse white flat target at the same rangereading is given in decibel (dB). Negative values indicate diffusely reflecting targets, whereas positive values are usually retro-reflecting targets. Reflectance is distance independent, thus is a perfect attribute for many different classifications and further processing.

 

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Coordinatesystem

Coordinate systems enable geographic datasets to use common locations for global positioning. A coordinate system is a reference system used to represent the locations of geographic features, imagery and observations.

 

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3D scan

A 3D scan (also referred to as a point cloud) is the result of the three-dimensional measuring with a 3D laser scanner. A 3D scan displays the 3D coordinates of a real object's surface and its surroundings in the form of millions of points. The 3D scan is the basis for creating 3D models.

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