groupPlacesfunction

Gather crowded places: the ground is cut into bands of cell degrees of latitude, and each band into cells about as wide on the ground, and the places in one cell become one group drawn at their middle. The cells are fixed to the ground, so the groups turn with the Earth and do not change as it turns. A here place is never gathered. Groups come in the order of their first place; a cell of 0 leaves every place on its own. Thousands of places cost one pass.

import { groupPlaces } from "@johnmorrisdotca/chikyu-earth/markers";

function groupPlaces(places: readonly Place[], cell: number): PlaceGroup[]

import { groupPlaces } from "@johnmorrisdotca/chikyu-earth/markers";

const places = [{ id: "a", lon: 139.69, lat: 35.69 }, { id: "b", lon: 139.75, lat: 35.66 }, { id: "c", lon: -0.13, lat: 51.51 }];
console.log(groupPlaces(places, 8).map((group) => group.members)); // [[0, 1], [2]]

[ [ 0, 1 ], [ 2 ] ]