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It is not a good idea to display all data on the map (especially if you have more than 100 000 objects) as point. In openlayers there are heatmap(http://www.patrick-wied.at/static/heatmapjs/) and cluster map (http://openlayers.org/en/v3.6.0/examples/cluster.html). I recommend using one of them In my software I create own "interpolation image" with data


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Depends on what you consider "visualisation". You can just use QGIS. Load the coordinates as separated text layer or whatever format you have. Then use the OpenLayers plugin to get a background OSM layer. Or if you actually do have world-wide data, better use Natural Earth vector data to show it in an appropriate projection. http://qgis.org/ ...


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since I'm from the debian/ubuntu universe it is called differently at centos/rhel... have a look at http://wiki.osgeo.org/wiki/Enterprise_Linux_GIS#How_to_enable_the_ELGIS6_repository at centos it is called grass-devel-* (see http://elgis.argeo.org/repos/6/elgis/x86_64/) remark: 6.4 is the old stable branch. I recommend 7.0 -> much more fun.



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