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August 25 2013

Quantum GIS (qgis) Tutorials : tutorial : Making Heatmaps using QGIS and GRASS

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.

August 21 2013

Free gis Datasets - Categorised List

Free #gis Datasets - Categorised List
http://freegisdata.rtwilson.com

This page contains a categorised list of links to over 300 sites providing freely available geographic datasets - all ready for loading into a Geographic Information System.

#qgis #shapefile #data

August 20 2013

Drive Time Isochrones – An Example Using Finnish Airports | Anita Graser

Drive Time Isochrones – An Example Using Finnish Airports | Anita Graser
http://anitagraser.com/2011/02/12/drive-time-isochrones

http://underdark.files.wordpress.com/2011/02/fin_airports3.png

I’ve already shown how to create drive time isochrones for one network node based on pgRouting and QGIS.  Today, I’ll show how to create drive time isochrones for a set of points – in this case all airports in Finland.

#cartographie #gis #postgis #qgis

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