Light Detection and Ranging (LiDAR) Mapping
We’re taking Surveying into the 21st Century!
NFPS now offers LiDAR Mapping, a remote sensing technology used to acquire elevation data about the Earth’s surface. A lidar system consisted of three main components: the laser ranging system, Global Positioning System (GPS) and Inertial Measurement Unit (IMU).
The laser ranging system transmits a laser pulse down to the Earth’s surface, and the time delay between the transmission of the laser pulse and its return to the sensor is measured. This two-way travel time is then converted into a range or distance from the sensor to the target. The range has a timestamp based on the precise GPS time and is related to the LiDAR sensor scan angle and the unit’s position. The unit’s 3-D (x, y, z) position is maintained by the precise survey GPS and the IMU is used to measure the roll, pitch and heading of the aircraft so that the ranges measured by the LiDAR sensor can be converted to points and georeferenced (x, y, z coordinates) and represented as a lidar point cloud). The point cloud is processed using software to detect points that represent the ground, known as LiDAR point classification.
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