Hi guys, Here's a mid-year follow-up to the node density visualization.
Here's the density increase from the last time (June 3) to July 1: http://wiki.openstreetmap.org/w/images/5/52/Philippines_node_density_increase_from_2012-06-03_to_2012-07-01.png The new Bing imagery in June has resulted in increased data in Catanduanes, Metro Naga, Antique, Dumaguete, Butuan, and Tagbilaran. The new Orbview-3 imagery on the other hand resulted in increased data in Palawan, Romblon, and Antique. Here's the density increase from the start of the year to July 1: http://wiki.openstreetmap.org/w/images/5/56/Philippines_node_density_increase_from_2012-01-02_to_2012-07-01.png And here's the node density map itself as of July 1: http://wiki.openstreetmap.org/w/images/8/80/Philippines_node_density_2012-07-01.png Compare to the one from the start of the year: http://wiki.openstreetmap.org/w/images/8/81/Philippines_node_density_2012-01-02.png Eugene On Sun, Jun 3, 2012 at 4:43 PM, Eugene Alvin Villar <sea...@gmail.com> wrote: > Hi guys, > > I made a follow-up to the node density visualization I shared back in > March. This time, the map shows the node increase compared to the data > of the original map. Similar to before, brighter pixels represent > areas with higher node count increases. Gray pixels show the original > data as a baseline. > > You can view it here: > http://wiki.openstreetmap.org/w/images/5/56/Philippines_node_density_increase_from_2012-01-02_to_2012-06-03.png > > For comparison here's the original map: > http://wiki.openstreetmap.org/w/images/8/81/Philippines_node_density_2012-01-02.png > > Take note that this is not a map of editing activity! It only merely > shows node density increases. (So if someone deleted a node in an area > and another one created a node, there will be no change in the node > counts.) But this visualization does somewhat indicate where new data > is being added. > > It's nice to see that most parts of the Philippines have seen an > increase in data. You can see the obvious effect of the new Bing > imagery that was released back in February as bright rectangular > areas. > > Nice work everyone! Let's keep it up! :-) > > Eugene > > > On Sat, Feb 25, 2012 at 8:38 PM, Eugene Alvin Villar <sea...@gmail.com> wrote: >> Correction, that should be 0.01°, not 0.1°. :-) >> >> On 2/25/12, Eugene Alvin Villar <sea...@gmail.com> wrote: >>> 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. :-) >>> >>> Eugene -- http://vaes9.codedgraphic.com _______________________________________________ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
