@turf/point-on-line

@turf/point-on-line

pointOnLine

Takes a Point and a LineString and calculates the closest Point on the (Multi)LineString.

Parameters

• lines (Geometry | Feature<(LineString | MultiLineString)>) lines to snap to
• pt (Geometry | Feature<Point> | Array<number>) point to snap from
• units string can be degrees, radians, miles, or kilometers (optional, default kilometers)

Examples

var line = turf.lineString([
    [-77.031669, 38.878605],
    [-77.029609, 38.881946],
    [-77.020339, 38.884084],
    [-77.025661, 38.885821],
    [-77.021884, 38.889563],
    [-77.019824, 38.892368]
]);
var pt = turf.point([-77.037076, 38.884017]);

var snapped = turf.pointOnLine(line, pt, 'miles');

//addToMap
var addToMap = [line, pt, snapped];
snapped.properties['marker-color'] = '#00f';

Returns Feature<Point> closest point on the line to point. The properties object will contain three values: index: closest point was found on nth line part, dist: distance between pt and the closest point, location: distance along the line between start and the closest point.

---

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/point-on-line

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

$ npm install @turf/turf