Power lines and street lamps

PowerLinesLayer draws the power grid: steel pylons and poles where they are mapped, with three sagging wires per span between them. It also stands street lamps along the streets, which light up at dusk and night. Data comes from Overture's base theme (OpenStreetMap power features), whose prebuilt tiles carry an infrastructure layer.

import { PowerLinesLayer } from 'maplibre-landmarks';

map.addSource('overture-base', {
  type: 'vector',
  url: 'pmtiles://https://overturemaps-extras-us-west-2.s3.amazonaws.com/tiles/2026-09-23.1/base.pmtiles',
});
map.addLayer(new PowerLinesLayer({ id: 'power', source: 'overture-base' }));

(pmtiles:// needs the pmtiles protocol, as for the roof tiles.) MapLibre loads a source's tiles only when a style layer uses it: give the source any layer, for example an invisible line layer on infrastructure.

How it is built

• Supports come from power_tower (pylons) and power_pole (poles) points, heights from their OSM height tag (in source_tags), else 30 m for pylons and 10 m for poles.
• Spans join consecutive supports along each power_line / minor_line. Tiles simplify lines (towers on a straight run drop out of the geometry) but keep the points, so supports are ordered along the line. A span cut by a tile edge is joined to the first tower of the same line straight ahead in the next tile. A line without mapped supports hangs from its vertices, except those in water.
• Supports are turned across their line; wires hang from the arm tips and the top, sagging 3% of the span.
• Buried cables and substations are left out.
• Street lamps come from the same layer's street_lamp points (OSM highway=street_lamp): a 6 m post with an arm and a lantern, each turned its own way. The lanterns glow in the dawn, dusk and night themes, with a soft halo about 9 m across; by day they are unlit. The halo does not light the ground around it.

Options

Option	Default	Notes
source	required	Vector source with Overture's base schema
sourceLayer	'infrastructure'
minZoom	14
maxSupports	2000	Nearest supports drawn
farCutoff	true	Pitched views draw supports only to about three screen heights away
water	same source, 'water'	Water polygons: a line without mapped supports gets no pole in water; false turns it off
streetLamps	true	Street lamps; { maxLamps } sets how many of the nearest are drawn (3000), false leaves them out
onError	—

Methods: getStats() (supports, spans, tallest, lamps).