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107 lines
4.5 KiB
Markdown
107 lines
4.5 KiB
Markdown
# Help map out on-street parking
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This guide assumes you've edited OSM before. Contact <dabreegster@gmail.com> if
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you have any trouble. Also give me a heads up when you make some edits, so I can
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regenerate the maps!
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1. [Install A/B Street](https://github.com/dabreegster/abstreet/blob/master/docs/INSTRUCTIONS.md)
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2. Choose **Contribute parking data** on the main screen
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3. Change the map if you'd like to focus somewhere in particular
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4. Click a road with unknown parking
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5. Select what kind of on-street parking the road has
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6. Repeat
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7. Click **Generate OsmChange file**
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8. Upload the diff.osc file by adding a layer in JOSM (or send it to me)
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Like all edits to OSM, to figure out ground-truth, you can survey in-person or
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use
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[Bing Streetside](https://wiki.openstreetmap.org/wiki/Bing_Maps#Streetside_imagery).
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**Do not use data from Google Maps to edit OSM.**
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## FAQ
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### Why?
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I'm trying to build a realistic traffic simulation of Seattle using OSM data,
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then use it to strengthen proposals for
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[pedestrianized streets](https://dabreegster.github.io/abstreet/lake_wash/proposal.html),
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[improving the bike network](https://www.glwstreets.org/45th-st-bridge-overview),
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and
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[mitigating the West Seattle bridge closure](https://dabreegster.github.io/abstreet/west_seattle/proposal.html).
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A/B Street is only as good as its data, and parking is one of the biggest gaps.
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Missing data means unrealistic traffic as vehicles contend for few parking
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spots, and roads that look much wider than they are in reality.
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### Why put this data in OSM?
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Why can't I just grab parking data from
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[SDOT's map](http://web6.seattle.gov/SDOT/seattleparkingmap/), using the
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[blockface](http://data-seattlecitygis.opendata.arcgis.com/datasets/blockface)
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dataset? Well, I'm trying -- when you see a parking lane in the tool, it's
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coming from blockface, unless that road in OSM is tagged. But the blockface
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dataset is comically wrong in many places -- for example, the Montlake bridge
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apparently has unrestricted parking?! King County GIS has confirmed the dataset
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isn't meant to be used for this level of detail.
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Plus, if the data is in OSM, anybody else can make use of it.
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### How does the tool work?
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A/B Street attempts to render individual lanes and intersections from OSM data.
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This makes it useful to audit the lane tags in OSM, including
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[parking:lane](https://wiki.openstreetmap.org/wiki/Key:parking:lane). The tool
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tracks your edits and when you generate the OsmChange file, it grabs modified
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ways from the OSM API to generate a diff. You can inspect the diff, load it in
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JOSM, and upload.
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**Your changes won't immediately be reflected in A/B Street.** Let me know when
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you've done some amount of mapping, and I'll regenerate the maps from fresh
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data.
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### Why use this tool?
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You don't have to; [this tool](https://zlant.github.io/parking-lanes/) or ID or
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JOSM all work. But the UI is clunky for this specific purpose. (Also, if you
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find this tool clunky in any way, let me know and I'll fix it.) There's also a
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proposed
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[StreetComplete quest](https://github.com/westnordost/StreetComplete/issues/771).
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### What about parking restrictions?
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There are many
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[parking:lane](https://wiki.openstreetmap.org/wiki/Key:parking:lane) tags to
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indicate restricted parking zones, time restrictions, etc. Feel free to map that
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in ID or JOSM, but I'm just looking to make a first pass over a wide area.
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### What about off-street parking?
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Ideally I'd also like to know how many private parking spots are available to
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residents of each building. But I don't know of an OSM schema for mapping this,
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or a practical way to collect this data. Let me know if you have ideas.
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### What about long roads where parking appears and disappears?
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The tool won't help. Use your favorite editor to split the way when the lane
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configuration changes. Also feel free to just skip these areas.
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### How to coordinate with other mappers?
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If somebody wants to set up HOT tasking, that'd be great, but I don't expect so
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many people to jump on this.
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### I noticed weird roads in the tool
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Welcome to my world. ;) If the number of lanes seems wrong, select the road and
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check the OSM tags. I'm inferring lanes from that. Feel free to make manual OSM
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edits to fix any problems you see. (I'd like to extend this tool to make that
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easier; let me know if you have ideas how to do this.)
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### I want to map an area, but there's no option for it
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To keep the release size small, I'm not including all maps yet. Let me know what
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you'd like to see included.
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Or if you have a `.osm` file, try the [quick start guide](new_city.md).
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