@@ -26,7 +26,7 @@ a nadir view), some algorithms are more suitable than others. This computation i
programming unit possible in the Rugged library and an interface is defined with several different
implementations among which user can select.
Three different algorithms are predefined in Rugged:
Four different algorithms are predefined in Rugged:
* a recursive algorithm based on Bernardt Duvenhage's 2009 paper
[Using An Implicit Min/Max KD-Tree for Doing Efficient Terrain Line of Sight Calculations](http://researchspace.csir.co.za/dspace/bitstream/10204/3041/1/Duvenhage_2009.pdf)
