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@@ -4,36 +4,44 @@
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map geometry. These categories (IDs) are used to link geometry
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object(s) to attribute records (from attribute table linked to vector map).
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+
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<h2>NOTES</h2>
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-Use <em><a href="v.to.db.html">v.to.db</a></em> to upload related categories to
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-a linked attribute table.
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+Use <em><a href="v.to.db.html">v.to.db</a></em> to upload related categories
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+to a linked attribute table.
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<p>
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-The <b>type</b> parameter specifies the type of geometry objects to which the category is added;
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-it is similar to an input filter - only the geometry specified in 'type' is processed.
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-
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+The <b>type</b> parameter specifies the type of geometry objects to which
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+the category is added; it is similar to an input filter - only the
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+geometry specified in 'type' is processed.
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<p>
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If the <b>type</b> parameter is set to <b>centroid</b> and
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the <b>option</b> parameter set to <b>add</b>, new categories will be
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added to existing centroids. Note however, that new centroids cannot
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be created this way. To do so, they must be added manually
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using <em><a href="v.digit.html">v.digit</a></em> or by
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-running <em>v.category</em> with the type parameter set to area (see
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-below also).
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+running <em>v.category</em> with the type parameter set to area.
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+<p>
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+Areas are a special case because it is impossible to attach a cat to
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+an area without a centroid; in this case, the module places new
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+centroids in areas automatically.
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<p>
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-Areas are a special case because it is impossible to attach a cat to an area without a centroid;
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-in this case, the module places new centroids in areas automatically.
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+The <b>cat</b> parameter is only used with <b>option</b>=<i>add</i> and
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+<b>option</b>=<i>sum</i>.
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<p>
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-The <b>id</b> parameter specifies the list of feature ids to which the
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+The <b>ids</b> parameter specifies the list of feature IDs to which the
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operation is performed; by default, all vector feature ids are processed.
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-The <b>id</b> is an internal (unique) geometry id that all vector primitives possess,
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-and is separate from any category the feature may also possess.
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-Use <div class="code"><pre><em><a href="v.edit.html">v.edit</a></em> map=inputname tool=select</pre></div>
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+The <i>feature ID</i> is an internal (unique) geometry ID that all vector
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+primitives possess, and is separate from any category the feature may
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+also possess.
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+Use <div class="code"><pre>
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+ <em><a href="v.edit.html">v.edit</a></em> map=inputname tool=select
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+</pre></div>
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to find out the geometry ids of certain features.
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+
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<h2>EXAMPLES</h2>
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<h3>Report vector categories</h3>
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@@ -91,17 +99,22 @@ Print vector categories from the first layer, only for feature ids 1-50.
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v.category input=roads option=print layer=1 id=1-50
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</pre></div>
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+
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<h2>SEE ALSO</h2>
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<em>
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+<a href="v.centroids.html">v.centroids</a>,
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<a href="v.db.connect.html">v.db.connect</a>,
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+<a href="v.edit.html">v.edit</a>,
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<a href="v.to.db.html">v.to.db</a>
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</em>
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+
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<h2>AUTHOR</h2>
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Radim Blazek, ITC-irst, Trento, Italy<br>
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-Modified (the id parameter) by Martin Landa, FBK-irst (formerly ITC-irst), Trento, Italy, 2008/02
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+Modified (the id parameter) by Martin Landa,
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+ FBK-irst (formerly ITC-irst), Trento, Italy, 2008/02
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<p>
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<i>Last changed: $Date$</i>
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Hamish Bowman