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Re: [sumo-user] Problem with Elevation
Hello Jakob,
 
thans for your hint. Used a Gaussian filter and worked fine.
 
 
Gesendet: Freitag, 26. Mai 2023 um 20:05 Uhr
Von: "Jakob Erdmann" <namdre.sumo@xxxxxxxxx>
An: "Sumo project User discussions" <sumo-user@xxxxxxxxxxx>
Betreff: Re: [sumo-user] Problem with Elevation
- Option --no-internal-links has no effect on travel distance but should have some influence on travel times (they flow across left turns will be lower if vehicles cannot wait within an intersection but the flow at intersections may also be higher since with this option, there is no way for jammed cross-traffic to block the intersection).
- there is also option --geometry.max-grade.fix  which should help with smoothing at intersections to counteract the effect mentioned in https://github.com/eclipse/sumo/issues/13318
- The road in question seems to suffer from bad input elevation data so neither option is enough to fix the slope. The elevation profile along 82m is this:
312, 308, 304, 305, 309. The drop from 312 to 308 is over less than 10m of distance!
 
Something like this is needed: https://github.com/eclipse/sumo/issues/13321  I don't think anyone one the SUMO side will have time for this in the near term. Your pull requests are welcome. (Though you should be able to preprocess your GEOTiff with standard image smoothing techniques).
 
 
 
Am Fr., 26. Mai 2023 um 14:55 Uhr schrieb Florian Schnepf <florian.schnepf97@xxxxxx>:
Hello Jakob,
 
Does this option influence the travel time of the vehicles?
I rebuild my network with this option. I get smaller but still high slopes in positive and negative (for example -30,87° this edge of my first message). Is there anything else I can do?
 
 
Gesendet: Freitag, 26. Mai 2023 um 13:50 Uhr
Von: "Jakob Erdmann" <namdre.sumo@xxxxxxxxx>
An: "Sumo project User discussions" <sumo-user@xxxxxxxxxxx>
Betreff: Re: [sumo-user] Problem with Elevation
A workaround is to build (or rebuild) the network with option --no-internal-links, though this has the side effect of using a less detailed intersection model (https://sumo.dlr.de/docs/Simulation/Intersections.html#internal_links)
 
splitting the network would not help.
 
Am Fr., 26. Mai 2023 um 10:30 Uhr schrieb Florian Schnepf <florian.schnepf97@xxxxxx>:
Hello Jakob,
 
 
I added elevation data to my net using Geotiff from NASA Earth Observation. 
 
Now I get implausible values for the slope. For example this edge. If the edge would rise linear between the two junctions, the slope would be 2,09°. But in my output file the values jump from -44,2° to 8,2°
 
How is the z value for edges between two junctions computed? Would it be helpful to split the edges to get more junctions?
 
I atteched my network. 
 
 
Thank you for your continuous support
 
Regards,
Florian
 
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