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I import a CSV File and for each coordinate, I get a point in the map. Can I set a column for the value. Then the size should based on the value have a special size. Or based on all values, it should display from max to min value.

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In QGIS go to Layer Properties -> Style.

Either use 'Categorized' if you have a few values, 'Graduated' to be based on all the values (size is under the advanced menu) or create your own rules using 'Rule-based'.

See HERE for duplicate question (comment from Joseph).

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    +1, some examples are also shown in a similar question. – Joseph Mar 3 '15 at 15:01
  • Thanks for all ... did not see the other question as I wrote mine :-( – Hannes Mar 4 '15 at 11:04

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