<p dir="ltr">If you import the CSV as point in QGIS or in a spread sheet, you can easily separate them using the forest ID. In Qgis, you can save them to a shape file and then use the forest ID to split the shape file into different parts (vector menu).</p>
<p dir="ltr">Then, you could use your method of triangulation. </p>
<p dir="ltr">I also remember a plugin that will chain point into polygons. Don't know the name but search for something like point to line or point to polygons. </p>
<p dir="ltr">Python will also permit you to do that directly but I would try first to find a plugin that does it for you. I would help more but I am far from a PC.</p>
<p dir="ltr">Cheers<br></p>
<p dir="ltr">Nicolas Cadieux M.Sc.</p>
<div class="gmail_quote">On May 21, 2015 9:06 AM, "Nicole Stoffels [via OSGeo.org] " <<a href="/user/SendEmail.jtp?type=node&node=5206912&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>> wrote:<br type='attribution'><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Dear QGIS-users,
<br /><br />I have a csv-file containing the corner coordinates of different forests
<br />with different heights. The file is structured like this:
<br /><br />FID,forest_id,point_id,X,Y,height
<br />1,forest1,point1,10.915763,54.137004,25
<br />2,forest1,point2,10.917392,54.138734,25
<br />3,forest1,point3,10.915822,54.140197,25
<br />4,forest1,point4,10.913504,54.140824,25
<br />5,forest1,point5,10.913541,54.138637,25
<br />6,forest2,point1,10.897562,54.150324,20
<br />7,forest2,point2,10.897907,54.149662,20
<br />8,forest2,point3,10.900432,54.148912,20
<br />9,forest2,point4,10.901194,54.149092,20
<br /><br />Now I want to make two polygons from the two different forests
<br />containing the attribute height. If I had only one forest I would create
<br />a voronoi diagram and a delaunay triangulation and clipper them. But it
<br />would be too time consuming to do that for every forest, as I usually
<br />have rather 10 forests or more. Is there a way to get this done if all
<br />forests are in one csv-dataset only separated by there forest_id?
<br /><br />Thank you and sorry for the first mail, which was not yet finished.
<br /><br />Best wishes
<br />Nicole
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