Patton, Eric wrote:
> I was wondering if anyone could describe, or point me to a link of, the
> various r.grow metrics parameter definitions: euclidian, maximum, and
> manhattan.
Euclidean (aka "Pythagoras' theorem"):
d(dx,dy) = sqrt(dx^2 + dy^2)
http://en.wikipedia.org/wiki/Euclidean_metric
Isolines of distance from a point are circles
Manhattan:
d(dx,dy) = abs(dx) + abs(dy)
http://en.wikipedia.org/wiki/Manhattan_metric
Isolines of distance from a point are rhombi (diamonds).
[See Hamish' reply for the reason behind the "Manhattan" name.]
Maximum:
d(dx,dy) = max(abs(dx),abs(dy))
Isolines of distance from a point are squares.
> Also, are the comments regarding how r.grow decides how to grow between
> two equally eligible cells here
> (http://www.nabble.com/-GRASSLIST%3A7611--r.grow-to8629593.html#a8629593)
> still valid?
Yes.
--
Glynn Clements <[EMAIL PROTECTED]>
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