Length Measurement (Depth Interpolation)
Function Description: This tool is applicable to point cloud data to calculate the distance between two consecutive points.
Steps
1.Click Length(image) 
button via Planar Measurement mode.
2.Left click in the panoramic display window (PlanarImage) to select the starting point of length measurement.
3.Click the left mouse button to select the next measurement point.
4.Repeat the previous step until all measurement points are selected, and then double-click the left mouse button to complete the measurement, and the interface pop-up box will display the measurement length information.
5.Click the right mouse button before completing the measurement to cancel the last measurement point.