abstreet/docs/TODO_quality.md

TODO - Map quality

Geometry

• bad polyline shifting remains

  • from the remaining cases, looks like we need to totally remove some tight points and retry
  • make polygons use the corrections too?
  • bad polyline shifting causes jagged lane endings in generalized_trim_back

• handle small roads again somehow?

  • what's going on with O253 generally?

    • the base geometry in OSM is just wrong... because ways have to be connected at the center lines
    • one-lane coming off a 4 or 5 lane and going one way... maybe it should be shifted to the other side
      • that messes up the nice curve later. need to clip, not shift.

  • o123 is a pretty weird shape, it eats the entire curve

    • did the second_half stuff mess things up?

  • o40 has a long cut when merged, why not hit in the middle?

    • what if we allow intersections between infinite lines for merged cases?

  • try it bigger

  • deal with loop roads?

  • manually draw a picture of the weird intersection to see what would look reasonable. i think we need original road bands from deleted stuff to make decent polygons.

  • model U-turns

• degenerate-2's should only have one crosswalk

  • then make them thinner

• ped paths through sidewalk corners are totally broken

  • calculate the better paths first, then make the corner geometry from that?

• car turns often clip sidewalk corners now

• figure out what to do about yellow center lines

  • intersections on one-ways look weird
  • yellow and white lines intersect cars and turn icons and such
  • who should own drawing them?

More data

• lanes: https://data-seattlecitygis.opendata.arcgis.com/datasets/49d417979fec452981a068ca078e7070_3
  • not filled out for most streets
• traffic circles: https://data-seattlecitygis.opendata.arcgis.com/datasets/717b10434d4945658355eba78b66971a_6
• https://data-seattlecitygis.opendata.arcgis.com/datasets/sidewalks
  • disagrees with OSM road centers sometimes
• https://data-seattlecitygis.opendata.arcgis.com/datasets/curb-ramps
• high quality thick roads: https://seattlecitygis.maps.arcgis.com/apps/webappviewer/index.html?id=86cb6824307c4d63b8e180ebcff58ce2
• OSM has footways
  • but theyre not marked everywhere
  • and theyre hard to associate with roads (sometimes need to infer a planter strip)
• draw ALL water and greenery areas
• draw benches, bike racks
• render trees
• look for current stop sign priorities
  • https://gis-kingcounty.opendata.arcgis.com/datasets/traffic-signs--sign-point/

Low-priority geometry issues

• if building front path intersects another building, then scrap that building.

  • or wait, just require bldgs to be even closer to sidewalk first.
  • need to do polygon vs polygon check!
  • will need to speed it up with quadtree containing entire buildings. make sure these are easy to use.

• can we make OSM buildings with holes?

  • experiment with https://docs.rs/clipping/0.1.1/clipping/gh/struct.CPolygon.html and https://github.com/21re/rust-geo-booleanop

More problems to fix

• Disconnected map
  • Some lane-changing model needed to determine this
• Impossible turns (from a far bus lane to a crazy left)

Release

• publish the map data
• stabilize the code except for sim