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25 lines
1.9 KiB
HTML
25 lines
1.9 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'>Gradient Vector from Cartesian to Polar Coordinates</h1>
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<div class='author'>Victor Olaya & Volker Wichmann (c) 2004-2010</div>
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<div class='description'>Converts gradient vector from directional components (Cartesian) to polar coordinates (direction or aspect angle and length or tangens of slope).<br/>
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The module supports three conventions on how to measure and output the angle of direction:<br/>
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(a) mathematical: direction angle is zero in East direction and the angle increases counterclockwise<br/>
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(b) geographical: direction angle is zero in North direction and the angle increases clockwise<br/>
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(c) zero direction and orientation are user defined<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>X Component <div class='type'>Input Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Y Component <div class='type'>Input Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Direction <div class='type'>Output Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Length <div class='type'>Output Grid</div></dt><dd> <div class='constraints'></div></dd>
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<dt>Polar Angle Units <div class='type'>Choice</div></dt><dd> <div class='constraints'>Available choices: radians, degree</div></dd>
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<dt>Polar Coordinate System <div class='type'>Choice</div></dt><dd> <div class='constraints'>Available choices: mathematical, geographical, user defined</div></dd>
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<dt>User defined Zero Direction <div class='type'>Floating point</div></dt><dd>given in degree clockwise from North direction <div class='constraints'>Maximum: 360.0</div></dd>
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<dt>User defined Orientation <div class='type'>Choice</div></dt><dd> <div class='constraints'>Available choices: clockwise, counterclockwise</div></dd>
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</dl>
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</body></html>
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