Simple Comparison of Two Least-Cost Path Approaches. Beaudette, D. In Open Source Software Tools for Soil Scientists.
Simple Comparison of Two Least-Cost Path Approaches [link]Paper  abstract   bibtex   
Premise: Simple comparison between the least-cost path as computed by r.walk vs. r.cost. Default parameters, unity travel friction, and λ = 1 were used with r.walk. Slope percent was used as the accumulated cost for r.cost. Test region similar to that used in a previous navigation example. Results: r.walk Shorter total path (6.03 km) Tendency to stay mid-slope, and cross large drainage at the gentlest possible position r.cost Longer total path (7.12 km) Tendency to follow drainages upstream – not always possible in steep terrain
@incollection{beaudetteSimpleComparisonTwo2008,
  title = {Simple {{Comparison}} of {{Two Least}}-{{Cost Path Approaches}}},
  booktitle = {Open {{Source Software Tools}} for {{Soil Scientists}}},
  author = {Beaudette, Dylan},
  date = {2008},
  url = {http://mfkp.org/INRMM/article/11848778},
  abstract = {Premise: Simple comparison between the least-cost path as computed by r.walk vs. r.cost. Default parameters, unity travel friction, and λ = 1 were used with r.walk. Slope percent was used as the accumulated cost for r.cost. Test region similar to that used in a previous navigation example.

 Results:

 r.walk Shorter total path (6.03 km) Tendency to stay mid-slope, and cross large drainage at the gentlest possible position r.cost Longer total path (7.12 km) Tendency to follow drainages upstream -- not always possible in steep terrain},
  keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-11848778,computational-science,errors,gis,grass-gis,software-errors,software-uncertainty,spatial-analysis,uncertainty}
}
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