stevefaeembra
London Road Accidents 2005-2012
map of road accidents using the police Stats19 data and OpenStreetMap.
#EDIT: replaced original monochrome with colour version.
Mapped and rendered in QGIS 2.4 using the Print Composer.
Method: buffered each accident site by 20m, and used "points in polygon" to count how many accidents happened within 20m of each site. Then used data driven properties to scale each accident site using log10("PNTCNT")*3, and Symbol Levels to make sure the blackspots are shown on top.
End result is similar to Heatmap, but looks better when zoomed in IMO. Best viewed Large or Original sizes.
London Road Accidents 2005-2012
map of road accidents using the police Stats19 data and OpenStreetMap.
#EDIT: replaced original monochrome with colour version.
Mapped and rendered in QGIS 2.4 using the Print Composer.
Method: buffered each accident site by 20m, and used "points in polygon" to count how many accidents happened within 20m of each site. Then used data driven properties to scale each accident site using log10("PNTCNT")*3, and Symbol Levels to make sure the blackspots are shown on top.
End result is similar to Heatmap, but looks better when zoomed in IMO. Best viewed Large or Original sizes.