daniel, thanks for the explanations.
my need to calculate (and show) only 1x15 matrix blurred my vision of all the problems :) what I try to achieve is multimodal routing (foot+bus+foot) by showing three geometries combined into one (plus some instructions). michal On Fri, Apr 15, 2016 at 12:56:20PM -0700, Daniel Patterson wrote: > Michal, > > Strangely enough, we don't actually have the geometry. We find a path > across the Contraction Heirachy > routing graph, this may only have a small handful of edges. We can sum > these edges to get the route > duration, but to get the actual geometry or distance, we then have to > "unpack" those edges. > > The table plugin doesn't do this unpacking step. It gets the durations > easily, but would be significantly slower > if we also had to report back the route geometries. The API response would > probably also be huge (10s or 100's of MB?) for any > non-trivial number of route pairs in the table. To support that, we would > need a way to stream the response > asynchronously to the HTTP client, otherwise a couple of requests could use > up all the RAM on the server. > > Things are never as simple as they seem :-( > > daniel > > > On Apr 15, 2016, at 12:45 PM, Michal Palenik <michal.pale...@freemap.sk> > > wrote: > > > > that is what I already do, but it means a lot of (unnecessary) > > connections. I assume the geometries are already available when > > computing the duration. > > > > I was hoping for a "documentation lacking behind development" > > scenario... > > > > > > cheers, > > michal > > > > On Fri, Apr 15, 2016 at 04:09:49PM +0200, Daniel Hofmann wrote: > >> If you check the v5 spec you linked, you will see only Route, Trip and > >> Match providing a "geometries" option. > >> > >> What you can do is this: > >> - do a Table request from your position against all Bus / Tram stops in the > >> area / in a buffer of a few kilometers > >> - pick n shortest routes from the Table response and temporarily store > >> their destination coordinates > >> - do n Route request from your position against the n destination > >> coordinates and extract the geometry > >> > >> Cheers, > >> Daniel J H > >> > >> On Fri, Apr 15, 2016 at 3:49 PM, Michal Palenik <michal.pale...@freemap.sk> > >> wrote: > >> > >>> hi, > >>> > >>> within the new api, I am trying to find how to get geometry (together > >>> with perfect duration). is it possible? > >>> > >>> or do I have to make N*M queries for all the possible combinations? > >>> > >>> > >>> https://github.com/Project-OSRM/osrm-backend/wiki/New-Server-api#service-table > >>> > >>> I am trying to make a service like "show me the routes to the closest > >>> bus/tram stops" : http://epsilon.sk/mhd/ > >>> > >>> thanks > >>> > >>> michal > >>> > >>> -- > >>> michal palenik > >>> www.freemap.sk > >>> www.oma.sk > >>> > >>> > >>> _______________________________________________ > >>> OSRM-talk mailing list > >>> OSRM-talk@openstreetmap.org > >>> https://lists.openstreetmap.org/listinfo/osrm-talk > >>> > > > >> _______________________________________________ > >> OSRM-talk mailing list > >> OSRM-talk@openstreetmap.org > >> https://lists.openstreetmap.org/listinfo/osrm-talk > > > > > > -- > > michal palenik > > www.freemap.sk > > www.oma.sk > > > > > > _______________________________________________ > > OSRM-talk mailing list > > OSRM-talk@openstreetmap.org > > https://lists.openstreetmap.org/listinfo/osrm-talk > > > _______________________________________________ > OSRM-talk mailing list > OSRM-talk@openstreetmap.org > https://lists.openstreetmap.org/listinfo/osrm-talk -- michal palenik www.freemap.sk www.oma.sk _______________________________________________ OSRM-talk mailing list OSRM-talk@openstreetmap.org https://lists.openstreetmap.org/listinfo/osrm-talk
