Proportion' Length-scale Anisotropy of Relief
Lsar is a measure of anisotropy derived from a series of relative
length (relL) measures taken at a different orientations for
a given scale of observation.
Relative lengths taken at different orientations can be normalized
by dividing them by the sum of relative lengths from all orientations.
('exact proportion' normalization)
Each normalized relative length can be paired with its direction
and treated as a vector.
These vectors can be displayed in a rosette.
The length of the mean vector for a given rosette is epLsar.
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