@turf/bearing

What is @turf/bearing?

@turf/bearing is a module within the Turf.js library that provides geospatial analysis tools. Specifically, it calculates the bearing between two geographical points. This is useful in various applications such as navigation, mapping, and geographic information systems (GIS).

What are @turf/bearing's main functionalities?

Calculate Bearing

This feature calculates the bearing between two geographical points. The bearing is the angle between the north direction and the line connecting the two points, measured in degrees.

const turf = require('@turf/turf');

const point1 = turf.point([0, 0]);
const point2 = turf.point([10, 10]);
const bearing = turf.bearing(point1, point2);
console.log(bearing);

Calculate Bearing with Initial and Final Bearings

This feature allows you to calculate both the initial and final bearings between two points. The initial bearing is the angle at the starting point, while the final bearing is the angle at the destination point.

const turf = require('@turf/turf');

const point1 = turf.point([0, 0]);
const point2 = turf.point([10, 10]);
const initialBearing = turf.bearing(point1, point2, {final: false});
const finalBearing = turf.bearing(point1, point2, {final: true});
console.log(`Initial Bearing: ${initialBearing}, Final Bearing: ${finalBearing}`);

Other packages similar to @turf/bearing

geolib

Geolib is a library for geospatial calculations. It provides functions to calculate distances, bearings, and other geographic information. Compared to @turf/bearing, Geolib offers a broader range of geospatial functionalities but may not be as specialized in GIS analysis.

geodesy

Geodesy is a library for geodesic calculations. It includes methods for calculating distances, bearings, and other geospatial metrics. It is similar to @turf/bearing in terms of bearing calculation but also includes more advanced geodesic functions.

README

@turf/bearing

bearing

Takes two points and finds the geographic bearing between them, i.e. the angle measured in degrees from the north line (0 degrees)

Parameters

• start (Geometry | Feature<Point> | Array<number>) starting Point
• end (Geometry | Feature<Point> | Array<number>) ending Point
• final [boolean] calculates the final bearing if true (optional, default false)

Examples

var point1 = {
  "type": "Feature",
  "properties": {},
  "geometry": {
    "type": "Point",
    "coordinates": [-75.343, 39.984]
  }
};
var point2 = {
  "type": "Feature",
  "properties": {},
  "geometry": {
    "type": "Point",
    "coordinates": [-75.534, 39.123]
  }
};

var bearing = turf.bearing(point1, point2);

//addToMap
var addToMap = [point1, point2]
point1.properties['marker-color'] = '#f00'
point2.properties['marker-color'] = '#0f0'
point1.properties.bearing = bearing

Returns number bearing in decimal degrees, between -180 and 180 degrees (positive clockwise)

---

This module is part of the Turfjs project, an open source module collection dedicated to geographic algorithms. It is maintained in the Turfjs/turf repository, where you can create PRs and issues.

Installation

Install this module individually:

$ npm install @turf/bearing

Or install the Turf module that includes it as a function:

$ npm install @turf/turf

Changelog

4.3.0

🚀 New Modules

• Rhumb Line Modules (https://github.com/Turfjs/turf/pull/728)
  • @turf/rhumb-bearing
  • @turf/rhumb-distance
  • @turf/rhumb-destination
• @turf/polygon-tangents Finds the tangents of a (Multi)Polygon from a Point. (https://github.com/Turfjs/turf/pull/708)
• @turf/rewind Rewind LineString or Polygon outer ring ~clockwise~ counter-clockwise and inner rings ~counterclockwise~ clockwise (https://github.com/Turfjs/turf/pull/700 & https://github.com/Turfjs/turf/issues/66)
• @turf/isobands - Takes a grid FeatureCollection of Point features with z-values and an array of value breaks and generates filled contour isobands. (https://github.com/Turfjs/turf/pull/619)

🏅 New Features

• New function convertDistance to @turf/helpers (https://github.com/Turfjs/turf/pull/732)
• Add ignoreBoundary param @turf/inside (https://github.com/Turfjs/turf/pull/706)
• Add flattenEach/flattenReduce to @turf/meta. (https://github.com/Turfjs/turf/pull/712 & https://github.com/Turfjs/turf/issues/692)
• New Feature getGeom & getGeomType in @turf/invariant (https://github.com/Turfjs/turf/pull/720)
• Adds round(), radians2degrees() and degrees2radians() to turf-helpers (https://github.com/Turfjs/turf/pull/715)
• ⭐️ New Add FeatureCollection & GeometryCollection support to @turf/rewind (https://github.com/Turfjs/turf/pull/741)

🐛 Bug Fixes

• Fix @turf/circle translate properties (https://github.com/Turfjs/turf/pull/717)
• Apply equidistance @turf/buffer to polygons (https://github.com/Turfjs/turf/issues/660 & https://github.com/Turfjs/turf/pull/718)
• Fix jsts empty (Multi)Polygon error @turf/difference (https://github.com/Turfjs/turf/pull/725)
• Support Geometry Objects & Collection (https://github.com/Turfjs/turf/issues/710)
  • @turf/line-intersect (https://github.com/Turfjs/turf/pull/731)
  • @turf/line-chunk (https://github.com/Turfjs/turf/pull/726)
  • @turf/line-segment (https://github.com/Turfjs/turf/pull/727 & https://github.com/Turfjs/turf/pull/711)
  • @turf/line-overlap (https://github.com/Turfjs/turf/pull/711)
• New Reverse winding - Polygon CCW & Polygon CW @turf/rewind (https://github.com/Turfjs/turf/pull/741)
• ⭐️ New Fix Feature GeometryCollection to @turf/buffer (https://github.com/Turfjs/turf/pull/739)
• ⭐️ New Re-enable negative radius to @turf/buffer (https://github.com/Turfjs/turf/pull/736)