SPEC.md

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

Minimum size of 0.25 pixels for OSM-sourced data

Buffer of 4 pixels

Fields

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

Ordering

None

water_names

Contents

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

Minimum size of 16 pixels for OSM-sourced data

Buffer of 128 pixels

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
• secondary: z9
• tertiary: z10
• 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.

Buffer of 128 pixels

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
• layer: Layer of object relative to others within this layer
• oneway: True if oneway=true or reverse, starts at z10
• brunnel: tunnel or bridge for tunnels or bridges, with bridge taking priority

Ordering

For z10 and above, by layer with highest layer first, ramp with ramps first, class with most significant first, name, then OSM id.

For z9 and below, by class, name, then OSM id.