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23 lines
1.6 KiB
HTML
23 lines
1.6 KiB
HTML
<html>
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<head><link rel="stylesheet" type="text/css" href="help.css" /></head>
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<body>
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<h1 class='module'>Topographic Position Index (TPI)</h1>
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<div class='author'>O.Conrad (c) 2011</div>
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<div class='description'>Topographic Position Index (TPI) calculation as proposed by Guisan et al. (1999). This is literally the same as the difference to the mean calculation (residual analysis) proposed by Wilson & Gallant (2000).<br/>
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<br/>
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References:<br/>
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- Guisan, A., Weiss, S.B., Weiss, A.D. (1999): GLM versus CCA spatial modeling of plant species distribution. Plant Ecology 143: 107-122.<br/>
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- Weiss, A.D. (2000): Topographic Position and Landforms Analysis. <a target="_blank" href="http://www.jennessent.com/downloads/tpi-poster-tnc_18x22.pdf">poster</a>.<br/>
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- Wilson, J.P. & Gallant, J.C. (2000): Terrain Analysis - Principles and Applications.<br/>
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</div>
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<h2>Parameters</h2>
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<dl class='parameters'>
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<dt>Grid system <div class='type'>Grid system</div></dt><dd>Grid system <div class='constraints'></div></dd>
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<dt>Elevation <div class='type'>Input Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Topographic Position Index <div class='type'>Output Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Standardize <div class='type'>Boolean</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Radius <div class='type'>Value range</div></dt><dd>radius in map units <div class='constraints'>Minimum: 1.6323834078e-316; Maximum: 1.63232332942e-316</div></dd>
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<dt>Weighting <div class='type'>Parameters</div></dt><dd>bandwidth has to be given as percentage of the (outer) radius <div class='constraints'></div></dd>
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</dl>
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</body></html>
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