[OSRM-talk] Extended graph output file
daniel at mapbox.com
Wed Nov 11 22:16:57 UTC 2015
There is some work-in-progress on the `edge_segment_lookup` branch that can give you some insight. If you enable the `-DDEBUG_GEOMETRY` flag with `make`, then `osrm-extract` and `osrm-prepare` can be instructed (with a new command-line parameter) to dump out some geometry information in GeoJSON format.
`osrm-extract` will dump out turn and stop-sign penalties with coordinates and bearings.
`osrm-prepare` will dump out individual segment weights (deciseconds) and speed values used in the final routing graph.
It's not super-easy to use, but it gives complete insight into the routing graph in a visual form. You can load the files into QGIS for visualization.
> On Nov 11, 2015, at 4:32 PM, Sotorrio, Pedro <sotorrio1 at llnl.gov> wrote:
> Thanks a lot, Daniel!
> From: Daniel Hofmann <hofmann at mapbox.com <mailto:hofmann at mapbox.com>>
> Reply-To: Mailing list to discuss Project OSRM <osrm-talk at openstreetmap.org <mailto:osrm-talk at openstreetmap.org>>
> Date: Wednesday, November 11, 2015 at 1:26 PM
> To: Mailing list to discuss Project OSRM <osrm-talk at openstreetmap.org <mailto:osrm-talk at openstreetmap.org>>
> Subject: Re: [OSRM-talk] Extended graph output file
> The edge-expanded graph already gets written to disk; this was introduced in the following commit:
> https://github.com/Project-OSRM/osrm-backend/commit/e45656e5bfb0b61a2859f0c754e66322996f1640 <https://github.com/Project-OSRM/osrm-backend/commit/e45656e5bfb0b61a2859f0c754e66322996f1640>
> which is not yet in the latest release, so you have to build from the develop branch.
> If you search for ebg you will see related files:
> https://github.com/Project-OSRM/osrm-backend/search?utf8=%E2%9C%93&q=ebg <https://github.com/Project-OSRM/osrm-backend/search?utf8=%E2%9C%93&q=ebg>
> Word of caution: the serialization in OSRM is done by just dumping internal datastructures in binary format.
> This is neither a portable between operating systems, compilers or even standard libraries, nor a stable format, and in particular not intended to be read from other programs.
> You would have to get the data structure layout right, in order to make use of the ebg file from other programs.
> On Wed, Nov 11, 2015 at 4:15 PM, Sotorrio, Pedro <sotorrio1 at llnl.gov <mailto:sotorrio1 at llnl.gov>> wrote:
>> I’m new in OSRM but my understanding is that the graph output file in OSRM is a binary file, correct?
>> Is there a way to write out the edged expanded graph (with turns) to a readable file?
>> Thanks a lot in advance,
>> OSRM-talk mailing list
>> OSRM-talk at openstreetmap.org <mailto:OSRM-talk at openstreetmap.org>
>> https://lists.openstreetmap.org/listinfo/osrm-talk <https://lists.openstreetmap.org/listinfo/osrm-talk>
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