By echo length
Not Lite
By echo length routine classifies points based on the length of a return signal that resulted in a point. The echo length can be stored as attribute for each laser point in TerraScan FastBinary format. It describes the relative length of a return signal compared to a typical return from a hard surface, for example:
•-50 - the echo is 50 mm shorter than a typical hard surface return.
•+845 - the echo is 845 mm longer than a typical hard surface return.
The routine requires that the echo length has been extracted for the points from waveform information. Alternatively, the Riegl Extra Byte attribute Pulse width is used in TerraScan as Echo length attribute if available.
SETTING |
EFFECT |
|---|---|
From class |
Source class(es). |
|
Opens the Select classes dialog which contains the list of active classes in TerraScan. You can select multiple source classes from the list that are then used in the From class field. |
To class |
Target class. |
Echo length |
Range of echo length values. A point is classified, if its echo length value falls within the given range. |
Inside fence only |
If on, points inside a fence or selected polygon(s) are classified. |
