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Geospatial Queries in MongoDB
- 1. http://linkedin.com/in/dannylane http://twitter.com/_danny_lane_ http://dannylane.github.io GEOSPATIAL QUERIES IN MONGODB Working With Location Based Data
- 3. MONGODB NoSQL { "_id": 1234, "vesselName": “Boaty McBoatface", "engineSize": "1200cc" } db.activeTrips.find({"vesselName": "Boaty McBoatface"});
- 4. STORING LOCATION DATA • Point • Polygon • LineString • MultiPoint • MultiLineString • MultiPolygon "currentPosition": [-11.469727, 51.88624] "currentPosition": { "type": "Point", "coordinates": [-19.753418, 54.542995] } Legacy & GeoJSON
- 5. { "_id": 1234, "vesselName": "Boaty McBoatface", "engineSize": "1200cc", "currentPosition": { "type": "Point", "coordinates": [ -7.322388, 51.852746 ]}}
- 6. $nearSphere db.activeTrips.find({ currentPosition: { $nearSphere: { $geometry: { type: "Point", coordinates: [ -8.497925, 51.69299 ]}, $maxDistance: 100000 }}});
- 7. $geoWithin db.activeTrips.find({ currentPosition: { $geoWithin: { $geometry: { type: "Polygon", coordinates: [ [[-8.497925, 51.69299], [-7.15211, 52.153714], [-6.624756, 51.37864], [-8.497925, 51.69299]] ]}}}});
- 8. $geoIntersects db.counties.find({ geometry: { $geoIntersects: { $geometry: { type: "Polygon", coordinates: [[[-8.76709, 53.47497], [-7.349854, 54.303704], [-6.602783, 52.609719], [-8.76709, 53.47497]]] }}}}); Galway Offaly Wexford Cavan Roscommon Laois Wicklow Monaghan Leitrim Kilkenny Kildare Fermanagh Longford Carlow Meath Westmeath
- 9. BEYOND GEOLOCATION • https://docs.mongodb.com • http://geojson.org • db.collection.mapReduce() • db.collection.aggregate() • Replica Sets • Sharding
Editor's Notes
- NoSQL JSON-like documents Rows & tables vs documents & collections
- GeoJSON is a standard format for encoding a variety of geographic data structures Well supported by google maps js, leaflet.js, mapbox Point is a single gps position Polygon is a bounded area, represented by an array of coordinates, first + last same, closed loop.
- Off coast between dungarvan & youghal
- Allows you to search for documents in a collection that are near a point you specify in your query Min and max optional and specified in Meters Use case – operator can send messages to active boaters near a specific location
- Allows search for documents in a collection that are enclosed in a specific boundary Use case – we could define a boundary for each coastguard flotaill and then use those boundaries to search for active trips that are within area of responsibility
- Intersects allows search for geographical areas in a collection that partially overlap with an area you supply in your query Geojson collection of counties Aprox 500k gps positions in the county collection