Created
August 13, 2019 17:52
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Clustering Users by S2 Cells
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const s2 = require('@radarlabs/s2'); | |
const user1LongLat = [-73.95772933959961, 40.71623280185081]; | |
const user2LongLat = [-73.95927429199219, 40.71629785715124]; | |
const user3LongLat = [-73.99206161499023, 40.688708709249646]; | |
const user1S2 = ["user1", new s2.CellId(new s2.LatLng(user1LongLat[1], user1LongLat[0])).parent(13)]; | |
const user2S2 = ["user2", new s2.CellId(new s2.LatLng(user2LongLat[1], user2LongLat[0])).parent(13)]; | |
const user3S2 = ["user3", new s2.CellId(new s2.LatLng(user3LongLat[1], user3LongLat[0])).parent(13)]; | |
const groups = {}; | |
[user1S2, user2S2, user3S2].forEach(([userId, cellId]) => { | |
const group = groups[cellId.token()] || []; | |
group.push(userId); | |
groups[cellId.token()] = group; | |
}); | |
console.log(groups); // { '89c2595c': [ 'user1', 'user2' ], '89c25a4c': [ 'user3' ] } |
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