Point cloud data is any data collected as the (x, y, z) location of a surface point based on some sort of focused energy return. This can be created using lasers, radar waves, acoustic soundings, or other waveform generation devices. The spacing between points is arbitrary and dependent on the type and position of the sensor collecting the data.
In this book, we will primarily be concerned with LIDAR data and radar data. Radar point cloud data is typically collected on space missions, while LIDAR is typically collected by terrestrial or airborne vehicles. Conceptually, both types of data are similar.
