LiDAR, or Light Detection and Ranging, is a remote sensing technology that uses laser light to measure the distance between objects. The system works by sending laser light from a source (transmitter) and detecting the reflected light from objects in the scene. The time of flight (TOF) is then used to create a distance map of the objects in the scene. From an airplane or helicopter, LiDAR systems send light to the ground.
Topographic LiDAR typically uses near-infrared laser to map land, while bathymetric LiDAR uses green light to measure the elevations of seabeds and riverbeds. The SNCF wanted to compare UAV LiDAR surveys with those conducted using traditional methods in a real-world situation. Therese Reinsch explains that when the LiDAR system collects data, point cloud, all the LiDAR data points are not ranked according to what they are affecting.
Where to Find Free LiDAR DataIf you're looking for free LiDAR data, there are several sources available.
USGS Earth Explorer, OpenTopography, OpenAerialMap, OpenLidarMap, LaserMapping, and GeoDataVault are some of the top sources for free LiDAR data.
ConclusionLiDAR is a powerful remote sensing technology that can be used to measure distances between objects and create detailed maps of land and water surfaces. With the help of free LiDAR data sources, you can start your search for the perfect dataset for your project. LiDAR data can be used for a variety of applications, from mapping land surfaces to measuring ocean depths.
With its ability to measure distances accurately and quickly, it is an invaluable tool for scientists and engineers alike. Whether you're looking for topographic or bathymetric data, there are plenty of free sources available to get you started on your project.