First vector layer definitions

[pnorman]

Normally I'd go with a just start coding approach for defining layers, but for #2 and my presentation I need a well-defined set of layers to start with.

I'm inclined to the following as a starting place

water

Contents

Polygonal water bodies.

• zoom 0 to 4, natural earth ocean + lake
• zoom 5 to 9, osm simplified_ocean_polygons
• zoom 10+, osm ocean_polygons
• zoom 5+ OSM waterway=riverbank or landuse=reservoir or natural=water

  Fields

• water: ocean, lake, river, reservoir, or value of OSM water tag

  Ordering

  By size

water_names

Contents

Points with water names Sources as with water layer, except sources without name data can be ignored.

Fields

• name: name of water body
• water: ocean, lake, river, reservoir, or value of OSM water tag

  Ordering

  By size then name as text

transport

Contents

Transportation linear features All from OSM data, with features appearing at the following zooms

• motorway: z6
• trunk: z7
• primary: z8
• tertiary: z9
• residential, unclassified: z12
• service, track, and non-motorized types: z14 _link roads of any type not shown until z10

Rail features not included for now.

If the feature is oneway, then the direction of it is the direction of travel.

Fields

• name: Name of road
• ref: Reference of road
• class: value of highway tag, excluding _link
• link: True if the feature is a _link, empty otherwise
• oneway: True if oneway=true or reverse
• brunnel: tunnel or bridge for tunnels or bridges, with bridge taking priority

Ordering

By layer with highest layer first, ramp with ramps first, class with most significant first, then name

[matthijsmelissen]

Sounds good. Some comments:

• Ramp is North-American English, using just 'link' might be clearer to those used to OSM terminology.
• Do we really have no way to use osm water on low zoom?
• trunk from z14 only seems a mistake?

[pnorman]

Do we really have no way to use osm water on low zoom?

Not really. There are some more experimental techniques, but nothing I want to deal with at the same time as everything else.

Fixed the other comments.