qminer/src/third_party/geospatial/example/staypoint.js

A C++ based data analytics platform for processing large-scale real-time streams containing structured and unstructured data

var qm = require('qminer');

base = new qm.Base({
    mode: "createClean",
    schema: [
        {
            "name": "GPS",
            "fields": [
              { "name": "User", "type": "int" },
              { "name": "Time", "type": "datetime" },
              { "name": "Location", type: "float_pair" },
              { "name": "Accuracy", type: "byte", "null": true },
              { "name": "Activities", type: "int_v", "null": true }
            ],
            "joins": [],
            "keys": []
        }
    ]
});
// used only for schema
// will not be used to hold records (push will not be called)
var store = base.store("GPS");
var aggr = new qm.StreamAggr(base, {
    type: "stayPointDetector",
    store: store,
    userField: "User",
    timeField: "Time",
    locationField: "Location",
    accuracyField: "Accuracy",
    activitiesField: "Activities",
    params: { dT: 50, tT: 300 }
});

//test1
var ts = Date.now();
for (var i = 0; i < 100; i++) {
    // create qminer wrapped record from JSON
    var rec = store.newRecord({
        Time: ts + i,
        Location: [Math.random(), Math.random()],
        Activities: [20,15,22,23,50],
        Accuracy: 1
    });
    // calls onAdd on all stream aggregates registered on store
    store.triggerOnAddCallbacks(rec);
    var result = aggr.saveJson();
    console.log(result);
    console.log(new Date(result.lastTimestamp));
}