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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" class="active"><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></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="#from-osm-to-rawmap-convert_osm-crate" id="from-osm-to-rawmap-convert_osm-crate">From OSM to RawMap (<code>convert_osm</code> crate)</a></h1>
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<p>The first phase of map building reads in data from OSM files and a few others,
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producing a serialized <code>RawMap</code>. Importing all maps (one for each pre-defined
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bounding polygon) takes a few minutes. Players don't see this cost; it only
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takes a few seconds to load a serialized map.</p>
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<ul>
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<li><code>osm.rs</code>: Read .osm, extracting the points for road-like ways, buildings, and
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areas
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<ul>
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<li>Areas usually come from a relation of multiple ways, with the points out of
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order. Gluing all the points together fails when the .osm has some ways
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clipped out. In that case, try to trace along the map boundary if the
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partial area intersects the boundary in a clear way. Otherwise, just use a
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straight line to try to close off the polygon.</li>
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<li>Also read traffic signal locations and turn restrictions between OSM ways</li>
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</ul>
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</li>
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<li><code>split_ways.rs</code>: Split OSM ways into road segments
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<ul>
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<li>OSM ways cross many intersections, so treat points with multiple ways and
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the points at the beginning and end of a way as intersections, then split
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the way into road segments between two intersections.</li>
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<li>This phase remembers which road segment is the beginning and end of the OSM
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way, for per-lane turn restrictions later</li>
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<li>Apply turn restrictions between roads here. Since OSM ways cross many
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intersections, the turn restrictions only apply to one particular road
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segment that gets created from the way. Make sure the destination of the
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restriction is actually incident to a particular source road.</li>
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</ul>
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</li>
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<li><code>clip.rs</code>: Clip the map to the boundary polygon
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<ul>
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<li>Osmosis options in <code>import.sh</code> preserve ways that cross the boundary</li>
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<li>Trim roads that cross the boundary. There may be cases where a road dips out
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of bounds, then immediately comes back in. Disconnecting it isn't ideal, but
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it's better to manually tune the boundary polygon when this happens than try
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to preserve lots of out-of-bounds geometry.</li>
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<li>Area polygons are intersected with the boundary polygon using the <code>clipping</code>
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crate</li>
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</ul>
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</li>
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<li><code>lib.rs</code>: Remove cul-de-sacs (roads that begin and end at the same
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intersection), because they mess up parking hints and pathfinding.</li>
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<li><code>lib.rs</code>: Apply parking hints from a King County GIS blockface dataset
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<ul>
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<li>Match each blockface to the nearest edge of a road</li>
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<li>Interpret the metadata to assign on-street parking there or not</li>
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</ul>
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</li>
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<li><code>lib.rs</code>: Apply offstreet parking hints from a King County GIS dataset
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<ul>
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<li>Match each point to the building containing it, plumbing through the number
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of spots</li>
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</ul>
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</li>
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<li><code>lib.rs</code>: <strong>Disabled</strong>: Apply sidewalk presence hints from a King County GIS
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dataset
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<ul>
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<li>Match each sidewalk line to the nearest edge of a road</li>
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<li>Update the road to have a sidewalk on none, one, or both sides</li>
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</ul>
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</li>
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<li><code>lib.rs</code> using the <code>srtm</code> module: Load (extremely poor quality) elevation data</li>
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</ul>
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