4 ms·

Would you mind educating us why? I cant seem to find info online immediately about shadows affects on lidar?

• saltcured 7y ago
  LIDAR doesn't really depend on any other illumination, so there are no shadows as such. If there is too much other illumination in the same wavelengths (or too little returned reflection) it might not register a return at all and this would appear as a hole in the data. If not shining straight down, it might have an error for the horizontal positioning of a building's roof, but it will still measure a discontinuity like a cliff edge where one measurement hits the roof elevation and the next hits the ground adjacent to the building. If measuring through a tree canopy, there will be multiple levels of returns as beams penetrate to different elevations before reflecting. These levels may include some measurement of the true ground level, unless the canopy is so dense that all beams hit a tree. So, a dense mass of trees or brush might obscure the true ground level beneath them. Perhaps the original article author conflated this with the idea of shadows.