LiDAR is the most comprehensive and precise data capturing practice to create elevation models of surfaces compared to other methods. Using active and passive sensors we capture the pulsed laser that illuminates the area to capture high-resolution maps which are crucial to generate DEM (Digital Elevation Models), DTM (Digital Terrain Models) and TIN (Triangular Irregular Networks). The wide range of laser scanning methods can be divided into three types.
- ALS (Airborne Laser Scanning) The scanners are attached to a UAV/Drone/Aircraft and the captured data is adequate to form a high-dense 3D point cloud model of the scanned area. This procedure enables the ability to separate the vegetation reflections out of the map to create a DSM.
- TLS (Terrestrial Laser Scanning) This commonly used process happens typically on earth’s surface and it can be either stationary or mobile activity. Point clouds captured through TLS can be matched with digital pictures of the area to generate 3D Models faster than conventional methods.
- MLS (Mobile Laser Scanning) Newest addition to geospatial analysis. Multiple scanners paired with GNSS (Global Navigation Satellite System) receivers and IMU (Inertial Measurement Unit) devices; are attached to the roof rack of a moving vehicle to gather data along a defined path. Scanners with various specifications will be chosen based on the required data, size of the area, required measurement range and more aspects.