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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><li class="chapter-item expanded "><a href="../dev/mass_import.html" class="active"><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"><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></ol>
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<h1><a class="header" href="#mass-importing-many-maps" id="mass-importing-many-maps">Mass importing many maps</a></h1>
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<p>For <a href="https://github.com/dabreegster/abstreet/issues/326">https://github.com/dabreegster/abstreet/issues/326</a>, I'm starting to figure
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out how to import hundreds of maps into A/B Street. There are many issues with
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scaling up the number of supported maps. This document just focuses on
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importing.</p>
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<h2><a class="header" href="#the-current-approach" id="the-current-approach">The current approach</a></h2>
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<p><a href="https://download.bbbike.org/">https://download.bbbike.org/</a> conveniently has 200 OSM extracts for major
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cities world-wide. The <code>data/bbike.sh</code> script downloads these. Then
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<code>data/mass_import.sh</code> attempts to import them into A/B Street.</p>
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<p>The bbike extracts, however, cover huge areas surrounding major cities.
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Importing such large areas is slow, and the result is too large to work well in
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A/B Street or the OSM viewer. Ideally, we want just the area concentrated around
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the "core" of each city.</p>
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<p><a href="https://github.com/dabreegster/abstreet/blob/master/convert_osm/src/bin/extract_cities.rs">https://github.com/dabreegster/abstreet/blob/master/convert_osm/src/bin/extract_cities.rs</a>
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transforms a huge .osm file into smaller pieces, each focusing on one city core.
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This tool looks for administrative boundary relations tagged as cities, produces
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a clipping polygon covering the city, and uses <code>osmconvert</code> to produce a smaller
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<code>.osm</code> file. The tool has two strategies for generating clipping polygons. One
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is to locate the <code>admin_centre</code> or <code>label</code> node for the region, then generate a
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circle of fixed radius around that point. Usually this node is located in the
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city core, so it works reasonably, except for "narrow" cities along a coast. The
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other strategy glues together the relation's multipolygon boundary, then
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simplifies the shape (usually with thousands of points) using a convex hull.
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This strategy tends to produce results that're too large, because city limits
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are often really huge.</p>
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<h2><a class="header" href="#problems" id="problems">Problems</a></h2>
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<ul>
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<li>Outside the US, administrative boundaries don't always have a "city" defined.
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In Tokyo in particular, this name isn't used. I'm not sure which boundary
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level to use yet.</li>
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<li>The tool assumes driving on the right everywhere. OSM has
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<a href="https://wiki.openstreetmap.org/wiki/Key:driving_side">https://wiki.openstreetmap.org/wiki/Key:driving_side</a>, but this is usually
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tagged at the country level, which isn't included in the bbike extracts.</li>
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<li>The resulting maps are all "flattened" in A/B Street's list, so you can't see
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any hierarchy of areas. Two cities with the same name from different areas
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will arbitrarily collide.</li>
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