[OSM-talk] [OSM-dev] Developers requested to help provide "completeness" tools

[Freek]

On Monday 12 May 2008, Skywave wrote:
> Freek recently created this image which shows how much of the AND data is
> untouched:
> http://www.vanwal.nl/osm/author_density_nl_20080502_full.png(warning 3 MB
> image).

(Blue is untouched AND, green and red have relatively more changes by the 
community.)

I also did an image showing the number of different (last) authors per area 
for a large part of Europe (untouched AND is not so interesting outside the 
Netherlands...):
http://www.vanwal.nl/osm/density/europe_1000_080513_num_authors.png (6 MB)
(Red is one author for all nodes covered by a pixel, green to blue depict an 
increasing number of authors, up to around 17.)
Central London clearly has the largest number of contributions from different 
people.

Secondly, I thought the average data age might show some interesting patterns 
(min. data age turned out to give rather noisy pictures).
http://www.vanwal.nl/osm/density/western_europe_500_080502_avg_age_value.png
("Lava" colour map: black = old --> red --> yellow --> white = latest 
contributions, compare to the dark-red AND import for a reference, this was 
September 2007. Also note that dark colours have a second meaning: they 
depict low node density.)
Now, London gets quite dark at some spots... More remarkably, this picture 
shows that data imports dramatically decrease mapping activity (or so it 
seems): not only the Netherlands show relatively little activity, also 
Osnabrück looks quiet (compare for example to the Ruhr area or the area 
between Brussels and Antwerp). Still, in my opinion, these imported areas are 
far from complete.

I think pictures like these can give at least some impression of the current 
state of affairs, but a human-maintained measure for completeness is still 
necessary.

-- 
Freek