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docs: update friction map info for r.walk.html (#3279)
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cmbarton authored and petrasovaa committed Dec 1, 2023
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Expand Up @@ -64,6 +64,9 @@ <h2>NOTES</h2>

<p>The <b>friction</b> cost parameter represents a time penalty in seconds
of additional walking time to cross 1 meter distance.
Friction cost can be any floating point value &ge; 0.
A friction map is a required parameter; if no friction costs are desired,
a friction map should be a raster in which all cells have a value of 0.
<p>The <b>lambda</b> parameter is a dimensionless scaling factor of the friction cost:

<div class="code"><pre>
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