This tool corrects the intensity attenuation due to atmospheric absorption. Because the light has to travel longer distances for points with large scan angles, these points may be detected with reduced intensities.
In order to get a reliant attenuation estimate several parameters are essential:
- Scanner height above ground level (AGL)
- Scanner wavelength [µm]
- Absorption coefficient [km^-1]
As the absorption coefficient may be difficult to grasp, lasintensity implements an atmospheric model which can estimate the absorption coefficient from a specified visibility range (visibility range = range at which a person with normal vision can still see an object before it becomes indistinguishable from the background); together with the lidar scanners wavelength.
Further information to attenuation due to atmospheric effects can be found at https://downloads.rapidlasso.de/doc/lasintensity.pdf and also in the README file.