@allmaps/bearing

Computes the bearing of a Georeferenced Map. Uses Turf.js internally.

import { parseAnnotation, generateAnnotation } from '@allmaps/annotation'
import { computeGeoreferencedMapBearing } from '@allmaps/bearing'

const annotation = await fetch(
  'https://annotations.allmaps.org/maps/0d76ed1b985f3913@cf34c4646fee9f4d'
).then((response) => response.json())

const maps = parseAnnotation(annotation)
const bearing = computeGeoreferencedMapBearing(map[0])
console.log(bearing)

API

computeGeoreferencedMapBearing(map)

Computes the bearing of a Georeferenced Map.

Parameters

• map ({ type: "GeoreferencedMap"; gcps: { resource: [number, number]; geo: [number, number]; }[]; resource: { type: "ImageService1" | "ImageService2" | "ImageService3" | "Canvas"; id: string; partOf?: ({ type: string; id: string; label?: Record<string, (string | number | boolean)[]> | undefined; } & { partOf?: ({ type: st...)
  • Georeferenced Map

Returns

The bearing of the map in degrees, measured from the north line (number).