Quantum GIS (#qgis) Tutorials: #tutorial: Making Heatmaps using QGIS and GRASS
▻http://qgis.spatialthoughts.com/2012/07/tutorial-making-heatmaps-using-qgis-and.html
Heatmaps are one of the best visualization tools for dense point data. Heatmaps are used to easily identify find clusters where there is a high concentration of activity.QGIS 1.8 introduced a #heatmap #plugin which allows you to create heatmaps directly from QGIS.