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Is it possible to have the representation like the one the heat-map like the figure below using QGIS? The way seems to use buffer options, but I do not know how. Does exist any plugin that helps? I am using QGIS1.8 on windows 7

power

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Giulio; the effect you are looking for is a raster operation (rather than vector) and is called a heat map. Try a search for QGIS and heat map and you will find lots of options. –  Darren Cope Sep 20 '13 at 15:42
    
Thanks, I will look for it. In web era the solution to a problem is to know the correct word of the problem, the solution is somewhere on :) –  Ale Sep 23 '13 at 7:45
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HeatMap Plugin for QGIS 1.8 is available

Heatmap Plugin

The Heatmap plugin allows to create a heatmap from a point vector map. A heatmap is a raster map showing the density or magnitude of point related information. From the result “hotspots” can easily be identified. Activate the Heatmap plugin

First this core plugin needs to be activated using the Plugin Manager (see Section Loading a QGIS Core Plugin). After activation the heatmap icon heatmap can be found in the Raster Toolbar.

Select from menu View ‣ Toolbars ‣ Raster to activate the Raster Toolbar when it is not yet activated.

enter image description here

http://docs.qgis.org/1.8/html/en/docs/user_manual/plugins/plugins_heatmap.html

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QGIS has a HeatMap Plugin that will do you what you want. Find it under Plugins > Heatmap. There are some instructions here: http://qgis.spatialthoughts.com/2012/07/tutorial-making-heatmaps-using-qgis-and.html

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