[OSM-talk] Map of Population Density vs. OpenStreetMap density

Christoph Hormann osm at imagico.de
Fri Jul 5 12:40:33 UTC 2019


On Friday 05 July 2019, Darafei "Komяpa" Praliaskouski wrote:
>
> http://disaster.ninja/live/
> <http://disaster.ninja/live/#overlays=alert-shape-GDACS_EQ_1183112_12
>65046,bivariate_class;id=GDACS_EQ_1183112_1265046;layer=default-style;
>position=-13.88712117940031,30.076044779387132;zoom=2.4760319802318693
>>
>
> What do you think?

Are your densities in people/object per ground square kilometers or per 
mercator square kilometers? (just to be sure - this is the number one 
mistake of any kind of density analysis in the OSM context)

One warning:  All global population data sets that exist are rough 
estimates with usually significant systematic biases and errors.  For 
example in Switzerland the data set you used sees high population 
density in mountain areas with no basis in reality.

And i am not a fan of deliberately pixelated visualizations where the 
data is shown in a pixel grid at a coarser resolution than what the 
display offers.

Apart from that this is an interesting analysis.  It would be kind of 
nice to also do it separately for density of features that actually 
correlate with population density in reality (buildings, roads, 
addresses, shops etc.) and physical geography, which can be mapped just 
as densely in areas with no population as in densely populated areas.

-- 
Christoph Hormann
http://www.imagico.de/



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