TerraScan: Range Classification with Terrestrial Scanner Data

Recently, a customer had a question about using the ‘Classify by Range’ (TerraScan -> Classify -> Routines -> Classify by Range) classification routine with terrestrial scanner (tripod-mounted static scanner) data.  This tool classifies points based upon each point’s respective range from the scanner’s position at the moment of collection.  This tool was designed to improve mobile LIDAR point cloud processing by eliminating the less dense and lower accuracy points that exist furthest from the sensor.  This capability is also needed when processing data derived from a stationary scanner.  This tool requires trajectory information.  Unfortunately, static scanners do not have this kind of information.  A very short trajectory could be constructed for the scanner position, but this also requires that the data is time-stamped as well, which may not be the case with this kind of scanner. There are alternatives to this option, that can accomplish the same goal with minimal fuss.

One could manually place a MicroStation design element using the ‘Place Active Point’ drawing tool at the 3D location of the scanner (Figure 1).

Figure 1: Manual scanner position placement

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