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56 lines
3.4 KiB
HTML
56 lines
3.4 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'>Catchment Area (Recursive)</h1>
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<div class='author'>O.Conrad (c) 2001</div>
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<div class='description'>Recursive upward processing of cells for calculation of flow accumulation and related parameters. This set of algorithms processes recursively all upwards connected cells until each cell of the DEM has been processed.<br/>
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<br/>
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References:<br/>
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<br/>
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Deterministic 8<br/>
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- O'Callaghan, J.F. / Mark, D.M. (1984):<br/>
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'The extraction of drainage networks from digital elevation data',<br/>
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Computer Vision, Graphics and Image Processing, 28:323-344<br/>
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<br/>
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Rho 8:<br/>
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- Fairfield, J. / Leymarie, P. (1991):<br/>
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'Drainage networks from grid digital elevation models',<br/>
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Water Resources Research, 27:709-717<br/>
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<br/>
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Deterministic Infinity:<br/>
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- Tarboton, D.G. (1997):<br/>
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'A new method for the determination of flow directions and upslope areas in grid digital elevation models',<br/>
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Water Ressources Research, Vol.33, No.2, p.309-319<br/>
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<br/>
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Multiple Flow Direction:<br/>
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- Freeman, G.T. (1991):<br/>
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'Calculating catchment area with divergent flow based on a regular grid',<br/>
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Computers and Geosciences, 17:413-22<br/>
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<br/>
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- Quinn, P.F. / Beven, K.J. / Chevallier, P. / Planchon, O. (1991):<br/>
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'The prediction of hillslope flow paths for distributed hydrological modelling using digital terrain models',<br/>
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Hydrological Processes, 5:59-79<br/>
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<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>Sink Routes <div class='type'>Input Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Weight <div class='type'>Input Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Material <div class='type'>Input Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Target <div class='type'>Input Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Catchment Area <div class='type'>Output Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Catchment Height <div class='type'>Output Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Catchment Slope <div class='type'>Output Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Total accumulated Material <div class='type'>Output Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Accumulated Material from _left_ side <div class='type'>Output Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Accumulated Material from _right_ side <div class='type'>Output Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Step <div class='type'>Integer</div></dt><dd> <div class='constraints'>Minimum: 1.0</div></dd>
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<dt>Target Areas <div class='type'>Input Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Flow Path Length <div class='type'>Output Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Method <div class='type'>Choice</div></dt><dd> <div class='constraints'>Available choices: Deterministic 8, Rho 8, Deterministic Infinity, Multiple Flow Direction</div></dd>
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<dt>Convergence <div class='type'>Floating point</div></dt><dd>Convergence factor for Multiple Flow Direction Algorithm (Freeman 1991) <div class='constraints'></div></dd>
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</dl>
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</body></html>
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