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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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I think that with 13,000 records you might still get away with a single app loading a GeoJSON or TopoJSON file. Are you interested in sharing the data? I've got a single page web-app that allows you to explore a bunch of data about crashes here. If you use the clustering plugin, you get better performance. And then you can turn the clusters off when you ...


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While qgis2web does not explicitly expose an API, it would be possible to write a python script to load each dataset sequentially, and export it to Leaflet. You would need reasonable knowledge of Python and the QGIS API to achieve this.



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