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<ol class="chapter"><li class="chapter-item expanded "><a href="../index.html"><strong aria-hidden="true">1.</strong> Overview</a></li><li class="chapter-item expanded "><a href="../howto/index.html"><strong aria-hidden="true">2.</strong> Instructions</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../howto/map_parking.html"><strong aria-hidden="true">2.1.</strong> How to map on-street parking</a></li><li class="chapter-item expanded "><a href="../howto/new_city.html"><strong aria-hidden="true">2.2.</strong> Importing a new city</a></li></ol></li><li class="chapter-item expanded "><a href="../how_it_works.html"><strong aria-hidden="true">3.</strong> How it works</a></li><li class="chapter-item expanded "><a href="../case_studies/index.html"><strong aria-hidden="true">4.</strong> Case studies</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../case_studies/lake_wash.html"><strong aria-hidden="true">4.1.</strong> Lake Washington Blvd Stay Healthy Street</a></li><li class="chapter-item expanded "><a href="../case_studies/west_seattle.html"><strong aria-hidden="true">4.2.</strong> West Seattle mitigations</a></li><li class="spacer"></li></ol></li><li class="chapter-item expanded "><a href="../dev/index.html"><strong aria-hidden="true">5.</strong> Developer guide</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../dev/misc_tricks.html"><strong aria-hidden="true">5.1.</strong> Misc developer tricks</a></li><li class="chapter-item expanded "><a href="../dev/api.html"><strong aria-hidden="true">5.2.</strong> API</a></li><li class="chapter-item expanded "><a href="../dev/testing.html"><strong aria-hidden="true">5.3.</strong> Testing</a></li></ol></li><li class="chapter-item expanded "><a href="../map/index.html"><strong aria-hidden="true">6.</strong> Map model</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../map/importing/index.html"><strong aria-hidden="true">6.1.</strong> Importing</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../map/importing/convert_osm.html"><strong aria-hidden="true">6.1.1.</strong> convert_osm</a></li><li class="chapter-item expanded "><a href="../map/importing/geometry.html"><strong aria-hidden="true">6.1.2.</strong> Road/intersection geometry</a></li><li class="chapter-item expanded "><a href="../map/importing/rest.html"><strong aria-hidden="true">6.1.3.</strong> The rest</a></li></ol></li><li class="chapter-item expanded "><a href="../map/edits.html"><strong aria-hidden="true">6.2.</strong> Live edits</a></li><li class="chapter-item expanded "><a href="../map/misc.html"><strong aria-hidden="true">6.3.</strong> Misc</a></li><li class="chapter-item expanded "><a href="../map/platform.html" class="active"><strong aria-hidden="true">6.4.</strong> Exporting</a></li></ol></li><li class="chapter-item expanded "><a href="../trafficsim/index.html"><strong aria-hidden="true">7.</strong> Traffic simulation</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../trafficsim/discrete_event.html"><strong aria-hidden="true">7.1.</strong> Discrete event simulation</a></li><li class="chapter-item expanded "><a href="../trafficsim/travel_demand.html"><strong aria-hidden="true">7.2.</strong> Travel demand</a></li><li class="chapter-item expanded "><a href="../trafficsim/gridlock.html"><strong aria-hidden="true">7.3.</strong> Gridlock</a></li><li class="chapter-item expanded "><a href="../trafficsim/trips.html"><strong aria-hidden="true">7.4.</strong> Multi-modal trips</a></li><li class="chapter-item expanded "><a href="../trafficsim/live_edits.html"><strong aria-hidden="true">7.5.</strong> Live edits</a></li><li class="chapter-item expanded "><a href="../trafficsim/parking.html"><strong aria-hidden="true">7.6.</strong> Parking</a></li><li class="spacer"></li></ol></li><li class="chapter-item expanded "><a href="../project/index.html"><strong aria-hidden="true">8.</strong> Project</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../project/roadmap.html"><strong aria-hidden="true">8.1.</strong> Roadmap</a></li><li class="chapter-item expanded "><a href="../project/motivations.html"><strong aria-hidden="true">8.2.</strong> Motivations</a></li><li class="chapter-item expanded "><a href="../project/history/index.html"><strong aria-hidden="true">8.3.</strong> History</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../project/history/backstory.html"><strong aria-hidden="true">8.3.1.</strong> Backstory</a></li><li class="chapter-item expanded "><a href="../project/history/year1.html"><strong aria-hidden="true">8.3.2.</strong> Year 1</a></li><li class="chapter-item expanded "><a href="../project/history/year2.html"><strong aria-hidden="true">8.3.3.</strong> Year 2</a></li><li class="chapter-item expanded "><a href="../project/history/year3.html"><strong aria-hidden="true">8.3.4.</strong> Year 3</a></li></ol></li><li class="chapter-item expanded "><a href="../project/CHANGELOG.html"><strong aria-hidden="true">8.4.</strong> Full CHANGELOG</a></li><li class="chapter-item expanded "><a href="../project/references.html"><strong aria-hidden="true">8.5.</strong> References</a></li><li class="chapter-item expanded "><a href="../project/collaborations.html"><strong aria-hidden="true">8.6.</strong> Collaborations</a></li></ol></li></ol>
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<h1 class="menu-title">A/B Street</h1>
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<main>
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<h1><a class="header" href="#ab-streets-map-model-as-a-platform" id="ab-streets-map-model-as-a-platform">A/B Street's map model as a platform</a></h1>
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<p>A/B Street's representation of a city, built mostly from OSM and lots of
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heuristics, is likely useful to other projects. This doc brainstorms what it
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would look like to properly expose it to other users.</p>
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<p>To sum up what the map model provides: geometry + semantics.</p>
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<h2><a class="header" href="#use-cases" id="use-cases">Use cases</a></h2>
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<ul>
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<li>Different UIs (particularly 3D / VR) for exploring cities as they are or as
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they could be, like Streetmix 3D and Complete Street Rule</li>
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<li>Importing slices of a city as assets into a game engine like Godot
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<ul>
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<li>Imagine a hackathon where people easily build games based on the real world</li>
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<li>Like <a href="https://developers.google.com/maps/documentation/gaming/overview_musk">https://developers.google.com/maps/documentation/gaming/overview_musk</a>
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but open</li>
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</ul>
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</li>
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<li>A new OSM viewer/editor</li>
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</ul>
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<p>TODO: Give a quick Python example of what interacting with the end goal could
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look like.</p>
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<h2><a class="header" href="#just-data-is-not-enough" id="just-data-is-not-enough">Just data is not enough</a></h2>
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<p>At first glance, the existing <code>Map</code> structure could be written to some format
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with a nicely documented schema. This would certainly be useful, but it's not
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nearly enough. Interpreting the data sometimes requires lots of code, which
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already exists -- so why not expose it to users as well?</p>
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<p>Examples in OSM where I wish "standard libraries" existed to interpret the data:</p>
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<ul>
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<li>The simple task of detecting intersections between ways</li>
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<li><a href="https://github.com/dabreegster/abstreet/blob/master/map_model/src/make/initial/lane_specs.rs">Figuring out what lanes a road has from tags</a></li>
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<li>Gluing multipolygons together</li>
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<li>Inferring turns at an intersection, subject to the several types of turn
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restrictions</li>
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</ul>
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<p>A/B Street solves these problems (or at least it tries to), but by itself, the
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resulting data isn't always useful. So some examples of where a library would be
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needed too:</p>
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<ul>
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<li>Pathfinding. ABST does lots of work especially to handle "live" map edits and
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cheaply regenerate contraction hierarchies. Also, pathfinding requires obeying
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OSM turn restrictions that span multiple roads -- this prevents even plain old
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Dijkstra's from working correctly.</li>
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<li>Getting geometry in different forms. Lanes are stored as a <code>PolyLine</code>, but
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what if a consumer wants the thickened <code>Polygon</code>, either as points, or maybe
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even pre-triangulated vertices and indices?</li>
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</ul>
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<h2><a class="header" href="#how-would-an-apilibrary-work" id="how-would-an-apilibrary-work">How would an API/library work?</a></h2>
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<p>The traditional approach is to link against part of A/B Street as a library and
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call it through language-specific bindings. The more language-agnostic option is
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defining an API (maybe JSON or protobuf) and having clients run a local A/B
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Street server, making HTTP requests to it. This is like the "sidecar" pattern in
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microservice-land.</p>
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<h2><a class="header" href="#compatibility" id="compatibility">Compatibility</a></h2>
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<p>Really have to think through this carefully. Some examples of big changes on the
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horizon:</p>
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<ul>
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<li>Additive: separate cycleways and tramways. Likely no schema change.</li>
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<li>Modify: traffic signals will get
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<a href="https://github.com/dabreegster/abstreet/issues/295">more complex</a></li>
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<li>Modify: we'll likely try again to merge tiny intersections together, which
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would get rid of the current guarantees that a road/intersection is associated
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to one particular OSM object</li>
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</ul>
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<h2><a class="header" href="#layering" id="layering">Layering</a></h2>
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<p>Clients should be able to opt into different data layers. For example, A/B
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Street strips out OSM building tags right now to keep filesizes small. But an
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OSM viewer would want to keep this (and likely discard the large contraction
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hierarchies). So some pieces of the map model need to be teased apart into
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optional pieces, and probably loaded in as separate files.</p>
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<h2><a class="header" href="#the-bigger-vision" id="the-bigger-vision">The bigger vision</a></h2>
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<p>Depending what other open source projects are on board, the general idea is to
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start assembling an ecosystem of libraries/tooling to make it easier to build
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new things off of open GIS data.</p>
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