1. 1. Whats My Place in the Universe? Using Geo Indexes to Solve Existential Crises Building a Mobile App with MongoDB Part 2
2. 2. 2 The Scavenger Hunt App Users create scavenger hunts by pinning waypoints
3. 3. 3 The Scavenger Hunt App Players search for a scavenger hunt near their current position
4. 4. 4 The Scavenger Hunt App Basic Requirements
5. 5. 5 The Scavenger Hunt App Basic Requirements Mark target points
6. 6. 6 The Scavenger Hunt App Basic Requirements Mark target points Identify our users
7. 7. 7 The Scavenger Hunt App Basic Requirements Mark target points Identify our users Mark users progress during hunts
8. 8. 8 Waypoint { _id: ObjectId(), user: UUID, tour: UUDI name: "Doug's Dogs", desc: "The best hot-dog", clues: [ "Hungry for a Coney Island?", "Ask for Dr. Frankenfurter", "Look for the hot dog stand" ], "geometry": { "type": "Point", "coordinates": [125.6, 10.1] } };
9. 9. 9 Waypoint { _id: ObjectId(), user: UUID, tour: UUDI name: "Doug's Dogs", desc: "The best hot-dog", clues: [ "Hungry for a Coney Island?", "Ask for Dr. Frankenfurter", "Look for the hot dog stand" ], "geometry": { "type": "Point", "coordinates": [125.6, 10.1] } }; Geospacial Index: ensureIndex( { geometry: 2dsphere } )
10. 10. 10 Waypoint db.waypoints.find( { geometry: { $near:{ { type : "Point" , coordinates : [ -173, 40.7 ] }, $maxDistance : 100 } }});
11. 11. 11 GEOJSON Point MultiPoint LineString MultiLineString Polygon MultiPolygon GeometryCollection http://geojson.org/
12. 12. Crisis 1: The sense of being alone and isolated in the world
13. 13. 13 The Checkpoint Document { _id: ObjectId(), user: UUID, huntId: UUID, timestamp: ISODate(), geometry: { type: "Point", coordinates: [125.6, 10.1] } }
14. 14. 14 The Checkpoint Document { _id: ObjectId(), user: UUID, huntId: UUID, timestamp: ISODate(), geometry: { type: "Point", coordinates: [125.6, 10.1] } } db.checkpoints.ensureIndex( timestamp: -1, geometry: 2dsphere );
15. 15. 15 The Checkpoint Document db.checkpoints.find( { date: {$gt: } geometry: { $near:{ { type : "Point" , coordinates : [ -173, 40.7 ] }, $maxDistance : 100 } }}); { _id: ObjectId(), user: UUID, huntId: UUID, timestamp: ISODate(), geometry: { type: "Point", coordinates: [125.6, 10.1] } }
16. 16. 16 The Checkpoint Document db.checkpoints.find( { date: {$gt: } geometry: { $near:{ { type : "Point" , coordinates : [ -173, 40.7 ] }, $maxDistance : 100 } }}); { _id: ObjectId(), user: UUID, huntId: UUID, timestamp: ISODate(), geometry: { type: "Point", coordinates: [125.6, 10.1] } }
17. 17. 17 The Scavenger Hunt App
18. 18. 18 Polygon
19. 19. 19 Polygon Data Driven Decision How many people live around this area How many of my customers are around this distribution center What time of the day do they actually get in front of the shop Where are my competitors located How much time does it take get from A -> B
20. 20. 20 Polygon { "type": "Polygon", "coordinates" : [ [ [ -73.969581, 40.760331 ], [ -73.974487, 40.762245 ], [ -73.977692, 40.763598], [ -73.979508, 40.761269 ], [ -73.982364, 40.762358 ], [ -73.983692, 40.760497 ], [ -73.972821, 40.755861 ], [ -73.969581, 40.760331 ] ] ] } Defines a business service area
21. 21. 21 Polygon Defines a business service area { "type": "Polygon", "coordinates" : [ [ [ -73.969581, 40.760331 ], [ -73.974487, 40.762245 ], [ -73.977692, 40.763598], [ -73.979508, 40.761269 ], [ -73.982364, 40.762358 ], [ -73.983692, 40.760497 ], [ -73.972821, 40.755861 ], [ -73.969581, 40.760331 ] ] ] }
22. 22. 22 Polygon
23. 23. 23 $geowithin { geometry: { $geoWithin: { $geometry : { 'type': "Polygon", 'coordinates': [ [ [ -73.975181, 40.758494 ], [ -73.973336, 40.760965 ], [ -73.974924, 40.761663 ], [ -73.976748, 40.759160 ], [ -73.975181, 40.758494 ] ] ] }}}}
24. 24. 24 $geoIntersects { $geoIntersects: { $geometry: { "type": "Point", "coordinates": [ -73.975010, 40.760071 ] } } }
25. 25. 25 Complex Polygons
26. 26. 26 Complex Polygons { "type": "Polygon", "coordinates" : [ [ [ -73.969581, 40.760331 ], [ -73.974487, 40.762245 ], [ -73.977692, 40.763598], [ -73.979508, 40.761269 ], [ -73.982364, 40.762358 ], [ -73.983692, 40.760497 ], [ -73.972821, 40.755861 ], [ -73.969581, 40.760331 ] ], [[ -73.975181, 40.758494 ], [ -73.973336, 40.760965 ], [ -73.974924, 40.761663 ], [ -73.976748, 40.759160 ], [ -73.975181, 40.758494 ]] ] }
27. 27. 27 Complex Polygons
28. 28. 28 Complex Polygons { $geoIntersects: { $geometry: { "type": "Point", "coordinates": [ -73.975010, 40.760071 ] } } }
29. 29. 29 Rendering Geo Elements { type: "GeometryCollection", geometries: [ { type: "Point", coordinates: [ -73.975010, 40.760071 ] }, { type: "Polygon", coordinates: [[ [-73.975181, 40.758494 ], [-73.973336, 40.760965 ], [-73.974924, 40.761663 ], [-73.976748, 40.75916 ], [-73.975181, 40.758494 ] ]] } ] }
30. 30. 30 Complex Polygons
31. 31. 31 Complex Polygons { "type": "Polygon", "coordinates" : [ [ [ -73.969581, 40.760331 ], [ -73.974487, 40.762245 ], [ -73.977692, 40.763598], ], [ [ -73.975181, 40.758494 ], [ -73.973336, 40.760965 ], [ -73.974924, 40.761663 ], .. ], [ [ -73.979437, 40.755390 ], [ -73.976953, 40.754362 ], [ -73.978364, 40.752448 ], ] ] }
32. 32. 32 Complex Polygons { "type": "Polygon", "coordinates" : [ [ [ -73.969581, 40.760331 ], [ -73.974487, 40.762245 ], [ -73.977692, 40.763598], ], [ [ -73.975181, 40.758494 ], [ -73.973336, 40.760965 ], [ -73.974924, 40.761663 ], .. ], [ [ -73.979437, 40.755390 ], [ -73.976953, 40.754362 ], [ -73.978364, 40.752448 ], ] ] } $err : Can't canonicalize query BadValue Secondary loops not contained by first exterior loop - secondary loops must be holes
33. 33. 33 Complex Polygons { "type": "Polygon", "coordinates" : [ [ [ -73.969581, 40.760331 ], [ -73.974487, 40.762245 ], [ -73.977692, 40.763598], ], [ [ -73.975181, 40.758494 ], [ -73.973336, 40.760965 ], [ -73.974924, 40.761663 ], .. ], [ [ -73.979437, 40.755390 ], [ -73.976953, 40.754362 ], [ -73.978364, 40.752448 ], ] ] } $err : Can't canonicalize query BadValue Secondary loops not contained by first exterior loop - secondary loops must be holes
34. 34. 34 { "type": "Polygon", "coordinates" : [ [ [ -73.969581, 40.760331 ], [ -73.974487, 40.762245 ], [ -73.977692, 40.763598], ], ] } { "type": "Polygon", "coordinates" : [ [ [ [ -73.979437, 40.755390 ], [ -73.976953, 40.754362 ], [ -73.978364, 40.752448 ], ] ] } Complex Polygons
35. 35. 35 Complex Polygons $or : [ { "geometry" : { "$geoWithin" : { "$geometry" : { "type" : "Polygon", "coordinates" : [ ... ] }, { "geometry" : { "$geoWithin" : { "$geometry" : { "type" : "Polygon", "coordinates" : [ ... ] }
36. 36. 36 Complex Polygons
37. 37. 37 Complex Polygons { $geoIntersects: { $geometry: { "type": "LineString", "coordinates": [ [-73.979543, 40.761132], [-73.974715, 40.759127], [-73.973363, 40.760969], [-73.970059, 40.759600] ] } }
38. 38. Crisis 2: Shattering of one's sense of reality, or how the world is.
39. 39. 39 Honolulu to Tokyo
40. 40. 40 Honolulu to Tokyo
41. 41. 41 Honolulu to Tokyo
42. 42. 42 Honolulu to Tokyo
43. 43. 43 Coordinate Reference System A system to locate geographical entities WGS84 datum Geoid - the shape of the surface of the oceans EGM96 gravitational model "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } }
44. 44. 44 Geoid Credit: ESA
45. 45. 45 Am I inside or outside the box?
46. 46. 46 The Correct Interpretation
47. 47. 47 Right Hand Rule
48. 48. Crisis 3: Anew-found grasp or appreciation of one's mortality.
49. 49. 49 BigPolygon in Action
50. 50. 50 BigPolygon in Action
51. 51. 51 BigPolygon in Action
52. 52. Crisis 4: Awareness of one's freedom and the consequences of accepting freedom.
53. 53. Questions?
54. 54. Thanks! { name: Bryan Reinero, title: Developer Advocate, twitter: @blimpyacht, code: github.com/breinero email: bryan@mongdb.com }