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Signal Group (SG) Selector

screenshot

With the signal group (sg) selector service, it is possible to match traffic lights to routes. This is done by matching linestring geometries (MAP topologies) of traffic lights to the route geometry. In our application we often use the term LSA synonymously for SG/Traffic Light. LSA means Lichtsignalanlage in German.

The service provides matching for OSM and DRN. For DRN see: https://github.com/priobike/priobike-graphhopper-drn

Citing

If you (re)use our work, please cite both papers:

@inproceedings{matthes2022matching,
  title={Matching Traffic Lights to Routes for Real-World Deployments of Mobile GLOSA Apps},
  author={Matthes, Philipp and Springer, Thomas},
  booktitle={2022 IEEE International Smart Cities Conference (ISC2)},
  pages={1--7},
  year={2022},
  doi={10.1109/ISC255366.2022.9922560},
  organization={IEEE}
}
@inproceedings{matthes2023geo,
  title={GeoAI-Powered Lane Matching for Bike Routes in GLOSA Apps},
  author={Matthes, Philipp and Springer, Thomas and Jeschor, Daniel},
  booktitle={The 31st ACM International Conference on Advances in Geographic Information Systems (SIGSPATIAL '23)},
  pages={1--4},
  year={2023},
  doi={10.1145/3589132.3625583},
  organization={ACM}
}

Algorithmic Selection

algorithm

This matching is achieved using above filtering pipeline. The filtering pipeline consists of these steps:

  1. Proximity matching – Exclude all signal groups that are too far away from the route.
  2. Bearing matching - Exclude all signal groups that have too much angle difference with regards to the route.
  3. Length matching - Exclude all signal groups which can not be projected onto the route without a too big length difference.
  4. Overlap matching - Under the remaining signal groups, find overlaps and decide for the better matches.
  5. Adding the crossings that are not connected (have no MAP-Topologies) from this dataset: https://metaver.de/trefferanzeige?docuuid=C498DEED-985C-11D5-889E-000102B6A10E

This filtering pipeline is defined as a hypermodel and tuned by Optuna on a training dataset. The best configuration is available with a RESTful API.

ML Selection

ml

This matching is achieved using a machine learning model, as shown above. This filtering includes the following steps:

  1. Proximity matching – Exclude all signal groups that are too far away from the route.
  2. ML matching – Extract features for each MAP topology with regards to the route, and make a binary classification ("match" or "no match").
  3. Overlap Cleanup – Detect overlaps and only select the topologies with the highest class probability for "match".
  4. Adding the crossings that are not connected (have no MAP-Topologies) from this dataset: https://metaver.de/trefferanzeige?docuuid=C498DEED-985C-11D5-889E-000102B6A10E

Quickstart

  1. Build and run the development setup

Run the development setup with

docker-compose up

On the very first startup, this will download the base Docker images and build the containers (can take some time). We provide example data so that you can understand our data format and try it out for yourself. This data is inherited from the Urban Data Platform Hamburg, which uses a FROST API. With the running docker-compose setup, this data is included in the PostGIS (running in the background) - see backend/run-preheating.sh.

  1. Send a request to the REST Endpoint at POST /routing/select

Request format

Select signal groups along a given route. The body of the POST request should contain a route as follows:

{
    "route": [
        { "lon": <longitude>, "lat": <latitude>, "alt": <altitude> },
        ...
    ]
}

Response format

Perform an example request with the example preset route:

curl --data "@backend/data/priobike_route_ost_west.json" 'http://localhost:8000/routing/select'

To select the OSM-specific algorithmic matcher, use:

curl --data "@backend/data/priobike_route_ost_west.json" 'http://localhost:8000/routing/select?matcher=legacy&routing=osm'

To select the DRN-specific algorithmic matcher, use:

curl --data "@backend/data/priobike_route_ost_west.json" 'http://localhost:8000/routing/select?matcher=legacy&routing=drn'

To select the OSM-specific machine learning matcher, use:

curl --data "@backend/data/priobike_route_ost_west.json" 'http://localhost:8000/routing/select?matcher=ml&routing=osm'

To select the DRN-specific machine learning matcher, use:

curl --data "@backend/data/priobike_route_ost_west.json" 'http://localhost:8000/routing/select?matcher=ml&routing=drn'

Results are in the following structure:

{
  "route": [
    {
      "lon": 9.990909,
      "lat": 53.560863,
      "alt": 9.99,
      "signalGroupId": "hamburg/271_14",
      "distanceOnRoute": 0,
      "distanceToNextSignal": 80.0591490111176
    },
    [...],
    {
      "lon": 9.978001,
      "lat": 53.564378,
      "alt": 20.22,
      "signalGroupId": null,
      "distanceOnRoute": 1011.180699223152,
      "distanceToNextSignal": null
    }
  ],
  "signalGroups": {
    "hamburg/271_14": {
      "label": "hamburg/271_14",
      "position": {
        "lon": 9.9902099,
        "lat": 53.5614479
      },
      "bearing": 305.47283546104495,
      "geometry": [
        [
          9.9902099,
          53.5614479
        ],
        [...]
        [
          9.9895951,
          53.561724
        ]
      ],
      "id": "hamburg/271_14",
      "lsaId": "271_14",
      "connectionId": "14",
      "laneType": "Radfahrer",
      "datastreamDetectorCar": null,
      "datastreamDetectorCyclists": null,
      "datastreamCycleSecond": "12864",
      "datastreamPrimarySignal": "12399",
      "datastreamSignalProgram": "9579"
    },
    [...]
  },
  "crossings": [
    {
      "name": "Rentzelstraße / An Der Verbindungsbahn",
      "position": {
        "lon": 9.978001,
        "lat": 53.564378
      },
      "connected": true
    },
  ]
}

Response Structure:

  • route: The waypoints of the route, with the signal groups and the current distance to the next signal, if exists.
  • signalGroups: A more detailled dictionary with information about all the signal groups, including datastream (FROST) ids.
  • crossings: A list of intersections along the route, including intersections that are not connected (and have no MAP-Topologies).

Matching on specific map data (OSM/DRN)

In our app, we initially only supported routing based on OpenStreetMap (OSM) data. For this we also developed and studied our two matching approaches (algorithmic and ML). During the evaluation we came to the conclusion that routes based on OSM-data contain a lot of routing errors with respect to a cycling-specific-routing. Later we implemented routing based on an other data source than OSM. Specifically we used the so called Digitales Radverkehrsnetz (DRN) Hamburg providing us a much more detailed and correct representation of the cycle paths in Hamburg. With the new data source we were able to achieve much better results with respect to a cycling-specific-routing which manifests itself, for example, in the following points:

  • Available cycle paths are used a lot more
  • Fewer unnecessary and incorrect detours on or off the cycle path

As a result the routes based on DRN differ from the routes based on OSM. Since our two matching algorithms were tuned/trained on the characteristics of OSM-routes in comparison to the turn topologies, we also re-tuned/-trained them for the new DRN-based routes. To choose the routing specific matching approaches, append the query parameter routing=osm/routing=drn to the /select-endpoint (as shown here: Response Format)

Reproducing / Benchmarking Results

Note: the following benchmarks utilize the complete dataset. The ML model is trained on a part of this dataset.

Cleanup, build and run the container and enter the shell:

docker-compose down -v && \
docker-compose up -d --no-deps backend && \
docker exec -it sg-selector-backend /bin/bash

Stay in the shell and prepare the data we need for experiments:

cd backend && \
poetry run python manage.py load_constellations && \
poetry run python manage.py load_errors

Keep in mind that switching between benchmarks requires starting from above, to ensure that no data is mixed up.

After the run_analysis command is executed, it will print the benchmark score to the command line as the profiler runs through the routes. After the run is finished, results w.r.t routing errors and route-lane constellations are stored in backend/backend/analytics/logs.

OSM benchmark on 2022 data (2414 traffic lights)

Used for the benchmark in the paper.

poetry run python manage.py load_lsas_from_file_old_json_format --path ../data/lsadata_hamburg.json && \
poetry run python manage.py load_example_routes ../data/example_routes_osm.json && \
poetry run python manage.py load_bindings ../data/bindings_old/ && \
poetry run python manage.py run_analysis --route_data osm_old

This should result in:

Profiling algorithm topo-osm-2022-trained-on-osm-2022 ... (148 routes)
TP: 920, FP: 207, FN: 123
Precision: 0.82
Recall: 0.88
F1: 0.847926267281106

and

Profiling algorithm topo-osm-2022-trained-on-osm-2023 ... (148 routes)
TP: 908, FP: 221, FN: 135
Precision: 0.80
Recall: 0.87
F1: 0.8360957642725597

and

Profiling algorithm ml-osm-2022-trained-on-osm-2022 ... (148 routes)
TP: 936, FP: 57, FN: 107
Precision: 0.94
Recall: 0.90
F1: 0.919449901768173

OSM benchmark on 2023-01-11 data (5168 traffic lights)

poetry run python manage.py load_lsas_from_file --path ../data/sgs-2023-01-11T14_30_50.004510.json && \
poetry run python manage.py load_example_routes ../data/example_routes_osm.json && \
poetry run python manage.py load_bindings ../data/bindings_osm/ && \
poetry run python manage.py run_analysis --route_data osm

This should result in:

Profiling algorithm topo-osm-2023-trained-on-osm-2022 ... (52 routes)
TP: 615, FP: 159, FN: 143
Precision: 0.79
Recall: 0.81
F1: 0.8028720626631854

and

Profiling algorithm topo-osm-2023-trained-on-osm-2023 ... (52 routes)
TP: 637, FP: 136, FN: 121
Precision: 0.82
Recall: 0.84
F1: 0.8321358589157413

and

Profiling algorithm ml-osm-2023-trained-on-osm-2022 ... (52 routes)
TP: 614, FP: 52, FN: 144
Precision: 0.92
Recall: 0.81
F1: 0.8623595505617978

Note: The OSM benchmark data has no routing errors or constellations marked.

DRN benchmark on 2023-01-11 data (5168 traffic lights)

poetry run python manage.py load_lsas_from_file --path ../data/sgs-2023-01-11T14_30_50.004510.json && \
poetry run python manage.py load_example_routes ../data/example_routes_drn.json && \
poetry run python manage.py load_bindings ../data/bindings_drn/ && \
poetry run python manage.py run_analysis --route_data drn

This should result in:

Profiling algorithm topo-drn-2023-trained-on-drn-2023 ... (49 routes)
TP: 655, FP: 95, FN: 83
Precision: 0.87
Recall: 0.89
F1: 0.8803763440860215

and

Profiling algorithm ml-drn-2023-trained-on-drn-2023 ... (49 routes)
TP: 676, FP: 24, FN: 62
Precision: 0.97
Recall: 0.92
F1: 0.9401947148817803

Contributing

This library is available under MIT License. Contributions are welcome. Here is our current progress:

  • Publish usable library with our topologic feature matching pipeline
  • Incorporate Python scripts for random route generation
  • Polish and push management commands for hypermodel training and testing
  • Add Route Composer web application which is used for training dataset generation
  • Include experimental matching approaches (ML-Model, Dijkstra, Probabilistic)
  • Advance experimental ML-based feature matching approach

Planned research on this topic is completed. Currently we focus on using the DRN dataset for routing and re-tuning our matching approaches.

Route Composer

composer

After running docker-compose up (in debug-mode such that the additional subcomponents also are runnning) under the following URLs sites are accessible:

In the route composer we used Carto (CARTO Basemaps Terms of Service: https://drive.google.com/file/d/1P7bhSE-N9iegI398QYDjKeVhnbS7-Ilk/view) in combination with OpenStreetMap (available under the Open Data Commons Open Database License, https://www.openstreetmap.org/copyright) for the map tiles.

Project Structure

This module is split into two components, the backend service that selects signal groups and the frontend service that is used to visualize the algorithms of the backend service. Additionally, the frontend service is used to manually create route-sg-mappings which can be used to validate the backend service. To realize this, the backend service provides additional subcomponents to communicate with the frontend via REST endpoints. However, these components are stripped in the deployed backend service since they are only used for development.

The routing-subcomponent (backend/backend/routing) is the only one being used in production and thus deployed.

  • analytics (backend/backend/analytics)
  • composer (backend/backend/composer)
    • Used to create the ground truth dataset.
  • demo (backend/backend/demo)
    • Used to test the matching approaches visually with some example routes.
  • jiggle_vis (backend/backend/jiggle_vis)
    • Used to try out a jiggle-/data-augmentation-feature visually with different MAP topologies.
  • ml_evaluation (backend/backend/ml_evaluation)
    • Used to evaluate different ML-models, feature subsets, projection methods and feature transformation methods as well as to perform hyperparameter tuning.
      • Thus it contains for example management commands for the following things:
        • Train models.
        • Tune hyperparameters.
        • Generate dataset with features from ground truth with labeled route and MAP topology samples.
        • Compute feature selection metrics such as transinformation, correlations and timings and perform RFE.
    • Configs for different configurations of features, feature transformations and other things can be found here: backend/backend/ml_evaluation/configs
  • projection_vis (backend/backend/projection_vis)

Anything unclear?

Help us improving this documentation. If you have any problems or unclarities, feel free to open an issue.