AFDD : US Army Aeroflightdynamics Directorate
SLAD : Safe Landing Area Determination
In this paper
* is described an algorithm used to determine the safest landing coordinates for a drone. It is said:
Because the AFDD SLAD is well documented in Ref 8, only a summary is provided.
Ref 8 is:
Anon., “libSLAD: Safe Landing Area Determination Library User’s Guide,” University Affiliated Research Center (UARC), 2010.
Unfortunately, I've failed to locate the paper (only found this).
I would be glad if anyone could find it, or an alternative description of said algorithm.