Merge branch 'upstream'

[routino] / doc / ALGORITHM.txt

diff --git a/doc/ALGORITHM.txt b/doc/ALGORITHM.txt
index 2432a88..d61f09e 100644 (file)
--- a/doc/ALGORITHM.txt
+++ b/doc/ALGORITHM.txt
@@ -143,12 +143,16 @@ Routing Preferences
           The other highway properties are specified by the user as a
           percentage and each highway either has that property or not. The
           user's property preference is scaled into the range 0.0 (for 0%)
-          to 2.0 (for 100%) to give a weighted preference, a second
+          to 1.0 (for 100%) to give a weighted preference, a second
           "non-property" weighted preference is calcuated in the same way
           after subtracting the user's preference from 100%. If a segment
-          has this property then the calculated score is divided by the
-          weighted preference, if the segment does not have this property
-          then it is divided by the non-property weighted preference.
+          has a particular property then the calculated score is divided
+          by the weighted preference for that property, if the segment
+          does not have this property then it is divided by the
+          non-property weighted preference. To ensure that setting
+          property preferences near 50% do not cause large variations in
+          routes the highway's preference is found by taking the square
+          root of the property preference.
 
 Implementation
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