triangle-geohash

triangle-geohash is pretty much geohash but with triangles. Earth is split into an icosahedron, and each one of those triangles is split into 4 sub triangles. Hashes are formatted in the following way: [primary triangle number]|[sub triangle number]..., so for example, the triangle geohash for the bermuda triangle, coordinates (27,-71), with depth 12, would be 15|222223334412, creepy huh?

usage

import

import { TriangleGeohash } from 'triangle-geohash';

init values

const lat = 27
const lon = -71
const depth = TriangleGeohash.Depths.km440 // depth 4

then, you can either get the deepest hash

const hash = TriangleGeohash.generateGeohash(lat, lon, depth)
// output: 15|2222

or get an array of all included geohashes

const hashes = TriangleGeohash.generateGeohashes(lat, lon, depth);
// output:
// [ '15|', '15|2', '15|22', '15|222', '15|2222' ]

NOTE:

If used in an optional way (you store approximate user location if they allow it), wrap code in try/catch blocks and add if it doesn't fail, so it won't mess up the whole process, and then you can notify them or something, ex failed to store approximate location.

Also note use of the word approximate above, if you're storing sensitive locations, don't use too much precision.

TODO

triangle-geohash is in its early stages and while it can generate geohashes, the idea is to find the closest hexagon/pentagon from a coordinate, to approximate a circle.

In order to do this, this is what needs to be done:

1. find the point nearest to the coordinate that's also a triangle vertex for the given depth
2. find the triangles surrounding that point for the given depth

Now, this is a lot easier said than done, and I haven't gotten there yet, so if you come up with something, I'll probably add it.