Count APRS radios in use by region

aprscounter.js

const aprs = require('aprs-parser');
const stream = new aprs.APRSISConnector;
stream.connect('W1ADV');
const geolib = require('geolib');

const stats = {
    us: {},
    eu: {},
    jp: {}
};

stream.on('aprs', (event) => {
    const radio = event && event.data && event.data.radio;
    if (radio && event.data.latitude && event.data.longitude) {
        let dist;
        dist = geolib.getDistance({ latitude: event.data.latitude, longitude: event.data.longitude }, { latitude: 37.090200, longitude: -95.712900 });
        if (dist < 2574950) {
            if (!stats.us[radio]) {
                stats.us[radio] = 0;
            }
            stats.us[radio]++;
        }
        dist = geolib.getDistance({ latitude: event.data.latitude, longitude: event.data.longitude }, { latitude: 54.526000, longitude: 15.255100 });
        if (dist < 2574950) {
            if (!stats.eu[radio]) {
                stats.eu[radio] = 0;
            }
            stats.eu[radio]++;
        }
        dist = geolib.getDistance({ latitude: event.data.latitude, longitude: event.data.longitude }, { latitude: 36.5314844, longitude: 138.0617335 });
        if (dist < 965606) {
            if (!stats.jp[radio]) {
                stats.jp[radio] = 0;
            }
            stats.jp[radio]++;
        }
    }
});




setInterval(() => {
    console.log(stats);
},60000);