Disaster Ninja is a map of global population density correlated to OpenStreetMap density. It shows the number of OpenStreetMap objects mapped compared to the local population density. The map can therefore be used to quickly identify populated locations around the world which have not been fully mapped on OSM.
Disaster Ninja was initially developed to help disaster relief. The map can be used to quickly determine the level of OSM coverage compared to the local population after a natural disaster. It is therefore a useful tool for organizations such as the Humanitarian OpenStreetMap Team, who develop and use OSM map data as part of their disaster response and management efforts.
The Disaster Ninja interactive map uses a bivariate choropleth overlay to show the number of OSM map objects compared to the population per kilometer squared. The red areas on the map are locations which have a high population density and a low number of mapped objects on OSM. The red areas on the map are therefore locations which are likely to not be fully mapped on OpenStreetMap. At the other end of the bivariate scale are the light green areas. These are locations with a relatively small population and a large number of mapped objects.
At a glance India and China seem to be two areas of the world with a relatively high population density and low OSM map object count. The very high population densities in some areas of these countries may partly account for this. However some of the most densely populated areas, such as New Delhi, Mumbai and Beijing actually show up as green on the map and are therefore relatively well mapped on OSM.
Via: Weekly OSM
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