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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/new_city.html"><strong aria-hidden="true">2.1.</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><li class="chapter-item expanded "><a href="../../dev/mass_import.html"><strong aria-hidden="true">5.4.</strong> Importing many maps</a></li><li class="chapter-item expanded "><a href="../../dev/data.html"><strong aria-hidden="true">5.5.</strong> Data organization</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/details.html"><strong aria-hidden="true">6.1.</strong> Details</a></li><li class="chapter-item expanded "><a href="../../map/importing/index.html"><strong aria-hidden="true">6.2.</strong> Importing</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../map/importing/convert_osm.html"><strong aria-hidden="true">6.2.1.</strong> convert_osm</a></li><li class="chapter-item expanded "><a href="../../map/importing/geometry.html" class="active"><strong aria-hidden="true">6.2.2.</strong> Road/intersection geometry</a></li><li class="chapter-item expanded "><a href="../../map/importing/rest.html"><strong aria-hidden="true">6.2.3.</strong> The rest</a></li><li class="chapter-item expanded "><a href="../../map/importing/misc.html"><strong aria-hidden="true">6.2.4.</strong> Misc</a></li></ol></li><li class="chapter-item expanded "><a href="../../map/edits.html"><strong aria-hidden="true">6.3.</strong> Live edits</a></li><li class="chapter-item expanded "><a href="../../map/platform.html"><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><li class="chapter-item expanded "><a href="../../side_projects/index.html"><strong aria-hidden="true">9.</strong> Side projects</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../side_projects/parking_mapper.html"><strong aria-hidden="true">9.1.</strong> Mapping on-street parking</a></li><li class="chapter-item expanded "><a href="../../side_projects/osm_viewer.html"><strong aria-hidden="true">9.2.</strong> OpenStreetMap viewer</a></li><li class="chapter-item expanded "><a href="../../side_projects/fifteen_min.html"><strong aria-hidden="true">9.3.</strong> 15-minute neighborhoods explorer</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="#roadintersection-geometry-rawmap-to-initialmap" id="roadintersection-geometry-rawmap-to-initialmap">Road/intersection geometry: RawMap to InitialMap</a></h1>
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<p>The remainder of map construction is done in the <code>map_model</code> crate. There's one
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intermediate structure between <code>RawMap</code> and <code>Map</code>, called <code>InitialMap</code>.</p>
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<ul>
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<li><code>make/remove_disconnected.rs</code>: Remove disconnected roads
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<ul>
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<li>Just floodfill from some road, assuming all roads are bidirectional, to get
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different partitions.</li>
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<li>Remove roads from all but the largest partition</li>
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</ul>
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</li>
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<li><code>make/initial/mod.rs</code> and <code>make/initial/lane_specs.rs</code>: Interpret OSM tags to
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figure out what lanes are on each side of each road, also figuring out the
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total width of the road.</li>
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<li><code>make/initial/geometry.rs</code>: Figure out the polygon for each intersection, and
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trim back road center-lines to end at a face of the polygon.
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<ul>
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<li>For every road touching the intersection, get the polyline of each side,
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based on the road's width
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<ul>
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<li>See appendix for how to shift polylines</li>
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</ul>
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</li>
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<li>Sort all the polylines by the angle to the intersection's shared point</li>
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<li>Intersect every polyline with every other polyline
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<ul>
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<li>More specifically -- the second half of each polyline, to get the correct
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collision point</li>
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<li>Look at the perpendicular infinite line to the collision point on the
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shifted polyline, then find where it hits the original center line. Trim
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back the center line by the max distance from these collisions.</li>
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</ul>
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</li>
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<li>Compute the intersection's polygon by considering collisions between
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adjacent roads' polylines</li>
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<li>Deal with short roads and floating point issues by deduping any adjacent
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points closer than 0.1m</li>
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