[talk-ph] Node density visualization

Eugene Alvin Villar seav80 at gmail.com
Sat Feb 25 12:18:27 GMT 2012

Hi guys,

I created a visualization showing the node density of OSM data in the
Philippines taken from the 2012-01-02 Geofabrik extract. Each pixel
represents a 0.1°×0.1° degree square or approximately 1 square
kilometer. Brighter pixels represent areas with higher node counts.

View it here: http://wiki.openstreetmap.org/w/images/8/81/Philippines_node_density_2012-01-02.png

The edges of available satellite imagery at that time is quite visible
in some areas like Pangasinan, Cebu, Bukidnon, and Davao del Sur. As
expected, brighter areas are places where there is a large amount of
editing and with a large population.

By the way, can you guess which place has the densest concentration of
nodes (the only purely white pixel in the image)? It's in Naga City
and this is due to the Naga City import. The second densest location
is in Marikina, and this is thanks to maning's efforts in mapping all
of the buildings in his adopted city. :-)


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