Heat Maps

Heatmaps provide a clear visual display of densities of features for easier analysis:

Use Cases

• When zoomed-out, clusters of points aren't terribly useful (& they also take a long time to download)
• Density of Incident Reports
• Density of Volunteers or Members

See

• ​http://workshops.opengeo.org/tutorial-wordmap/
• ​http://www.slideshare.net/abeusher/heatmaps-are-the-heat
  • Summary presentation from SOTM-US 2012
• ​http://www.sethoscope.net/heatmap/
  • Python toolkit, which works well with OpenStreetMap
• ​http://jjguy.com/heatmap/
  • Pyython toolkit using PIL
• ​AcidMaps: GeoServer plugin to work with WMS
• ​http://blog.felipebarriga.cl/programacion/openstreetmap-heatmap-using-openlayers/
  • ​http://blog.felipebarriga.cl/olheatmap_demo/
• ​ATMs in Beacon Hill, Boston
• ​Clickmaps
• ​gHeat - heatmaps for Google Maps
• ​OpenLayers' Cluster Strategy (which we already use)
  • Examples:
    • ​http://openflights.org/blog/2009/10/21/customized-openlayers-cluster-strategies/
    • ​http://www.erepat.com
• OpenLayers 2 has a couple of 3rd-party contributions:
  • ​http://www.websitedev.de/temp/openlayers-heatmap-layer.html
  • CamptoCamp:
    • ​http://dev.openlayers.org/sandbox/camptocamp/canvas/openlayers/examples/heatMap.html
    • ​http://dev.openlayers.org/sandbox/camptocamp/canvas/openlayers/lib/OpenLayers/Layer/Vector/HeatMap.js
    • ​http://dev.openlayers.org/sandbox/camptocamp/canvas/openlayers/lib/OpenLayers/Renderer/CanvasHeatMap.js
• OpenLayers 3 includes in trunk:
  • ​http://openlayers.org/en/master/examples/heatmap-earthquakes.html
  • ​http://openlayers.org/en/master/apidoc/ol.layer.Heatmap.html

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GIS BluePrints