dms-conversion

A JavaScript library for converting between decimal degrees and degrees, minutes, and seconds (DMS).

 

  

Installation

``console
npm install dms-conversion
`

$3

TypeScript example (from [Jasmine] test)


`typescript
import DmsCoordinates, { parseDms } from "dms-conversion";

describe("DmsCoordinates", () => {
const long = -122.902336120571;
const lat = 46.9845854731319;

it((${lat}, ${long}) coordinates should be ~ 46°59′5″ N, 122°54′8″ W, () => {
const dmsCoords = new DmsCoordinates(lat, long);
expect(dmsCoords instanceof DmsCoordinates).toBe(true);

const { longitude, latitude } = dmsCoords.dmsArrays;

let [d, m, s, nsew] = longitude;
expect(d).toBe(122);
expect(m).toBe(54);
expect(Math.round(s)).toBe(8);
expect(nsew).toBe("W");

[d, m, s, nsew] = latitude;

expect(d).toBe(46);
expect(m).toBe(59);
expect(Math.round(s)).toBe(5);
expect(nsew).toBe("N");

expect(dmsCoords.toString()).toMatch(/46°59′4.\d+″ N, 122°54′8.\d+″ W/i);
});

it("Regexp should work", () => {
const v = ["46°59′5″ N", "122°54′8″ W"];
v.forEach((s) => expect(s.match(DmsCoordinates.dmsRe)).toBeTruthy(true));
const [x, y] = v.map(parseDms);
expect(typeof x).toEqual("number");
expect(typeof y).toEqual("number");
});

it("Invalid numbers should throw exception", () => {
const x = parseDms("");
expect(isNaN(x)).toBe(true);
expect(() => {
const dmsc = new DmsCoordinates(lat, x);
}).toThrowError(RangeError);
expect(() => {
const dmsc = new DmsCoordinates("this should fail" as any, long);
}).toThrowError(TypeError);
});
});
``

Alternatives

nerik/formatcoords


[jasmine]: https://jasmine.github.io/