Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It only takes a minute to sign up.
Sign up to join this community
I'd like to ask overpass turbo how many objects have the same property in a given area.
For instance, what is the distribution of the building tag? could return:
// for a total of 3005 buildings for instance
yes: 3000
church: 3
school: 2
It would help me find where buildings have not been updated for a while, based on the source tag attribute.
As suggested by @scai, I wrote a shell script doing the job:
wget -O "/tmp/file" "http://overpass-api.de/api/interpreter?data=[out:csv('source', 'building';false)][timeout:25];
area[boundary='administrative'][admin_level='8']['name'='SomeCity']->.searchArea;
(
node['building'][source](area.searchArea);
way['building'][source](area.searchArea);
relation['building'][source](area.searchArea);
);
out;"
sort "/tmp/file" | uniq -c | sort -nr
out:csv provides a setting to suppress the header line, i.e. by saying [out:csv('source', 'building';false]. This way you could get rid of the tail -n +1 in your script.