http://www.wiki.mohid.com/index.php?action=history&feed=atom&title=Polygons 2026-04-04T19:29:19Z Revision history for this page on the wiki MediaWiki 1.28.0 http://www.wiki.mohid.com/index.php?title=Polygons&diff=770&oldid=prev 2008-12-03T10:39:01Z

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Guillaume http://www.wiki.mohid.com/index.php?title=Polygons&diff=769&oldid=prev 2007-05-31T10:04:38Z

<p>‎<span dir="auto"><span class="autocomment">Sample file</span></span></p> <p><b>New page</b></p><div>== Overview ==<br /> <br /> Polygon items relate to areas defined by a collection of vertices. Polygon items can be stored as a collection of polygons. This type of items can be used to define types of zones such as differentiate land and sea, soil use, etc. <br /> <br /> Polygons can be manually drawn on top of a Background Image or a Grid Data item, which usually represent geographical information. This allows visual distinguishing of areas in loaded maps.<br /> <br /> == Polygons file ==<br /> Polygons items are stored in an ASCII text file. The default extension for Polygons files in [[MohidGIS]] is '''*.xy'''. This file is organized in [[blocks]], each containing the vertices for a certain polygon. One block is defined by the following keywords: '''&lt;beginpolygon&gt;''' and '''&lt;endpolygon&gt;'''. Note that these [[keywords]] are case sensitive. One file can contain an infinite number of blocks. Inside each block there are 2 columns: the left relates to the XX coordinates of the polygon vertices and the right one to the YY coordinates of the polygon vertices. <br /> <br /> A third column can also be added in order to aid in the construction of curvilinear grids. In this column a value of -1, 0 or 1 can be defined indicating the direction into which the polygon corner turns to (clockwise direction). Learn more in [[Generating curvilinear grids]].<br /> <br /> == Sample file ==<br /> <br /> &lt;beginpolygon&gt;<br /> -9.5190 38.8148 0<br /> -9.4545 38.5699 0<br /> -9.2612 38.4098 0<br /> -9.0372 38.4686 0<br /> -9.0550 38.7375 0<br /> -9.1291 38.8921 0<br /> -9.2644 38.8792 0<br /> -9.4384 38.8438 0<br /> -9.5254 38.8373 0<br /> -9.5190 38.8148 0<br /> &lt;endpolygon&gt;<br /> <br /> [[Category:Input Data Formats]]</div>

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