By echo length

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By echo length

By echo length

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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. See Chapter Waveform Processing for more information about waveform processing in TerraScan.

byEchoLength

SETTING

EFFECT

From class

Source class(es).

_select_classes

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.