[OSM-dev] Visualization of OSM data - objects without specific nearby object

[Mateusz Konieczny]

Is anyone aware about tool that takes as input two sets of OSM tags and will output
visualization of data split into two groups

- objects with tags from set A, more than X meters from any object with tags from set B
- objects with tags from set A, no more than X meters from any object with tags from set B

?

For example

- highway=bus_stop for set A
- highway=service/residential/unclassified/tertiary/... for set B
- 20m as distance parameter

This one would allow to list bus stops that are suspiciously far away from roads.

In my case it would be "public objects without nearby bicycle parkings".
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Though, given that it seems to be build from 4 relatively simple steps it is likely that 
nobody who did it bothered to publish any part as a project.

But if anyone see something stupid in my plan below - let me know!

All parts of that are fairly easy

- build list of tags indicating major public objects (shop=*, amenity=place_of_worship,
amenity=restaurant, amenity=pharmacy, amenity=bar etc) [1]
- download data [2]
- run query to find public objects with/without nearby bicycle parkings [3]
- generate visualization depicting this data [4]


https://github.com/Leaflet/Leaflet.markercluster <https://github.com/Leaflet/Leaflet.markercluster>

[1] is fairly simple, just go through preset of Vespucci or some other editor
(though if anyone knows about listing of such tags - let me know)
[2] probably just download extract of some region and load into database
[3] postgis queries (ST_Buffer to build areas + ST_Within)?
Though it would get fun if I would start looking for 
"bicycle parking within X meters from entrance to a public object"
[4] https://github.com/Leaflet/Leaflet.markercluster <https://github.com/Leaflet/Leaflet.markercluster> for an initial version looks good enough
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