[GraphHopper] finding points along a route

[Nicolas Gillet]

Hello,

GraphHopper is perfectly suited to compute the route.
For the POI part, you'll need few more process but not that much.
Databases like PostgreSQL and other have a spatial extension that can very easily do what you're looking for in one single, yet efficient, query.
You'll end up writing something like "select * from MyPoiTable where st_contains(st_buffer(my_route_geometry, my_distance), MyPoiTable.geometry))"
Passing this query the route's geometry and distance to include POI's and you're done.

If you need to do more geometry operation inside your code, I recommend you the GeoTools library.

Finally I suggest you the OpenLayers javascript library to display your POI's along with the route on the map.

Nicolas GILLET


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-----Message d'origine-----
De : Konrad Bauckmeier [mailto:kontakt at dd4kids.de] 
Envoyé : vendredi 23 août 2013 09:12
À : graphhopper at openstreetmap.org
Objet : [GraphHopper] finding points along a route

Hello,
for a new (private) webproject, I would like to search and display POIs along a calculated route.
The POI-data would be stored in a database with lat/long-coordinates.

I suppose after getting a route from graphhopper, the program would have to search along this route and list all POIs with a given max distance/time from the original route?

Would it be possible to solve this problem in graphhopper with a reasonable amount of developing time at all? Or is graphhopper not the best starting point for this kind of questions?

Greetings Konrad

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