MongoDB Analytics: Learn Aggregation by Example - Exploratory Analytics and Visualization Using Flight Data
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This document discusses analyzing flight data using MongoDB aggregation pipelines and visualization with JSON Studio. It provides examples of aggregation queries to group and calculate statistics on carriers, airports, routes and delays. These include finding the largest carriers, airports with most cancellations, carrier delay statistics, and hub airports. Visualizing the results in JSON Studio is recommended to explore the data further.
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![An example for $unwind
Count how many airports each carrier lands in
{
"_id": {
"$oid": "5383623b7bfb8767e2e9ca1f"
},
"iata": "00M",
"airport": "Thigpen ",
"city": "Bay Springs",
"state": "MS",
"country": "USA",
"lat": 31.95376472,
"long": -89.23450472,
"carriers": [
"AA",
"UA",
"DL",
"BA"
]
}
…
[
{
"_id": {
"$oid": "5383623b7bfb8767e2e9ca1f"
},
"iata": "00M",
"airport": "Thigpen ",
"city": "Bay Springs",
"state": "MS",
"country": "USA",
"lat": 31.95376472,
"long": -89.23450472,
"carriers": "AA"
},
{
"_id": {
"$oid": "542217ffc026b858b47a6640"
},
"iata": "00M",
"airport": "Thigpen ",
"city": "Bay Springs",
"state": "MS",
"country": "USA",
"lat": 31.95376472,
"long": -89.23450472,
"carriers": "UA"
}
…
]
[
{
"_id": {
"carriers": "BA"
},
"count": 10
},
{
"_id": {
"carriers": "DL"
},
"count": 10
}
…
]
airports2
$unwind $group](https://image.slidesharecdn.com/aggmongodaysrbn-141001121340-phpapp01/85/MongoDB-Analytics-Learn-Aggregation-by-Example-Exploratory-Analytics-and-Visualization-Using-Flight-Data-17-320.jpg)
![Hub airports – try 3
{ $group: { _id: { ORIGIN: "$ORIGIN", CARRIER: "$CARRIER" }, count: { $sum: 1 } } },
{ $project: { airport: "$_id.ORIGIN", carrier: "$_id.CARRIER", "count": 1 } },
{ $match: { "count": { $gte: "$$hub_threshold" } } },
{ $group: {
_id: { airport: "$airport" },
airlines: { $sum: 1 },
flights: { $sum: "$count" },
avg_airline: { $avg: "$count" },
max_airline: { $max: "$count" } } },
{ $project: {
"airlines": 1,
"flights": 1,
"avg_airline": 1,
"max_airline": 1,
"avg_no_max": { $divide: [ { $subtract: [ "$flights", "$max_airline" ] }, "$airlines" ] } } },
{ $sort: { "flights": -1 } }](https://image.slidesharecdn.com/aggmongodaysrbn-141001121340-phpapp01/85/MongoDB-Analytics-Learn-Aggregation-by-Example-Exploratory-Analytics-and-Visualization-Using-Flight-Data-20-320.jpg)
![From-to Insensitive
{ $group: { _id: { UNIQUE_CARRIER: "$UNIQUE_CARRIER", ORIGIN: "$ORIGIN",
DEST: "$DEST" }, count: { $sum: 1 } } },
{ $match: { "count": { $gt: "$$count_threshold" } } },
{ $project: { _id_UNIQUE_CARRIER: "$_id.UNIQUE_CARRIER", "count": 1,
rroute: {
$cond: [
{ $lt: [ { $cmp: [ "$_id.ORIGIN", "$_id.DEST" ] }, 0 ] },
{ $concat: [ "$_id.ORIGIN", "$_id.DEST" ] },
{ $concat: [ "$_id.DEST", "$_id.ORIGIN" ] }
] } }
},
{ $group: { _id: { _id_UNIQUE_CARRIER: "$_id_UNIQUE_CARRIER", rroute: "$rroute" },
_sum_count: { $sum: "$count" } } }](https://image.slidesharecdn.com/aggmongodaysrbn-141001121340-phpapp01/85/MongoDB-Analytics-Learn-Aggregation-by-Example-Exploratory-Analytics-and-Visualization-Using-Flight-Data-22-320.jpg)
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MongoDB Analytics: Learn Aggregation by Example - Exploratory Analytics and Visualization Using Flight Data
- 1. Mongo Analytics – Learn aggregation by example Exploratory Analytics and Visualization using Flight Data www.jsonstudio.com
- 2. Analyzing Flight Data • JSON data imported from CSV downloaded from www.transtats.bts.gov • Sample document for a flight: { "_id": { "$oid": "534205f61c479f6149a92709" }, "YEAR": 2013, "QUARTER": 1, "MONTH": 1, "DAY_OF_MONTH": 18, "DAY_OF_WEEK": 5, "FL_DATE": "2013-01-18”, "UNIQUE_CARRIER": "DL”, "AIRLINE_ID": 19790, "CARRIER": "DL", "TAIL_NUM": "N325US”, "FL_NUM": 1497, "ORIGIN_AIRPORT_ID": 14100, "ORIGIN_AIRPORT_SEQ_ID": 1410002, "ORIGIN_CITY_MARKET_ID": 34100, "ORIGIN": "PHL", "ORIGIN_CITY_NAME": "Philadelphia, PA", "ORIGIN_STATE_ABR": "PA”, "ORIGIN_STATE_FIPS": 42, "DEST_AIRPORT_ID": 13487, "DEST_AIRPORT_SEQ_ID": 1348702, "DEST_CITY_MARKET_ID": 31650, "DEST": "MSP", "DEST_CITY_NAME": "Minneapolis, MN", "DEST_STATE_ABR": "MN", "DEST_STATE_FIPS": 27, "DEST_STATE_NM": "Minnesota", "DEST_WAC": 63, "CRS_DEP_TIME": 805, "DEP_TIME": 758, "DEP_DELAY": -7, "DEP_DELAY_NEW": 0, "DEP_DEL15": 0, "DEP_DELAY_GROUP": -1, "DEP_TIME_BLK": "0800-0859", "TAXI_OUT": 24, "WHEELS_OFF": 822, "WHEELS_ON": 958, "TAXI_IN": 4, "CRS_ARR_TIME": 1015, "ARR_TIME": 1002, "ARR_DELAY": -13, "ARR_DELAY_NEW": 0, "ARR_DEL15": 0, "ARR_DELAY_GROUP": -1, "ARR_TIME_BLK": "1000-1059", "CANCELLED": 0, "CANCELLATION_CODE": "", "DIVERTED": 0, "CRS_ELAPSED_TIME": 190, "ACTUAL_ELAPSED_TIME": 184, "AIR_TIME": 156, "FLIGHTS": 1, "DISTANCE": 980, "DISTANCE_GROUP": 4, "CARRIER_DELAY": "", "WEATHER_DELAY": "", "NAS_DELAY": "", "SECURITY_DELAY": "", "LATE_AIRCRAFT_DELAY": "", "FIRST_DEP_TIME": "", "TOTAL_ADD_GTIME": "", "LONGEST_ADD_GTIME": "", "": "" } • We will build aggregation pipelines and visualize data using JSON Studio (www.jsonstudio.com) • You will fall madly in love with the Aggregation Framework and it’s capabilities
- 3. MongoDB aggregation steps/stages • Grouping • Matching/filtering • Projection • Sorting • Unwind • Limit, skip • Added in 2.6 – Out – Redact
- 4. Who are the largest carriers?
- 5. Some Carrier Stats { "$group": { "_id": { "CARRIER": "$CARRIER" }, "_avg_DEP_DELAY": { "$avg": "$DEP_DELAY" }, "_avg_ARR_DELAY": { "$avg": "$ARR_DELAY" }, "_avg_DISTANCE_GROUP": { "$avg": "$DISTANCE_GROUP" }, "_avg_TAXI_IN": { "$avg": "$TAXI_IN" }, "_avg_TAXI_OUT": { "$avg": "$TAXI_OUT" } } } { "_id": { "CARRIER": "9E" }, "_avg_DEP_DELAY": 8.45451754385965, "_avg_ARR_DELAY": 3.3237368838726744, "_avg_DISTANCE_GROUP": 2.2188688815622624, "_avg_TAXI_IN": 7.082464246424642, "_avg_TAXI_OUT": 20.558167120639663 }
- 6. Which airports have the most cancellations?
- 7. Which carriers are most at fault for cancellations?
- 8. Arrival delays by distance
- 9. Delays by distance by carrier
- 10. Delays by distance by carrier – long haul only
- 11. Words of caution (courtesy of David Weisman)
- 12. Words of caution (courtesy of David Weisman)
- 13. What to do? “Touch” the data – e.g. Histograms
- 14. Words of caution (courtesy of David Weisman)
- 15. Words of caution (courtesy of David Weisman)
- 16. Order Does Matter http://docs.mongodb.org/manual/core/aggregation-pipeline-optimization/
- 17. An example for $unwind Count how many airports each carrier lands in { "_id": { "$oid": "5383623b7bfb8767e2e9ca1f" }, "iata": "00M", "airport": "Thigpen ", "city": "Bay Springs", "state": "MS", "country": "USA", "lat": 31.95376472, "long": -89.23450472, "carriers": [ "AA", "UA", "DL", "BA" ] } … [ { "_id": { "$oid": "5383623b7bfb8767e2e9ca1f" }, "iata": "00M", "airport": "Thigpen ", "city": "Bay Springs", "state": "MS", "country": "USA", "lat": 31.95376472, "long": -89.23450472, "carriers": "AA" }, { "_id": { "$oid": "542217ffc026b858b47a6640" }, "iata": "00M", "airport": "Thigpen ", "city": "Bay Springs", "state": "MS", "country": "USA", "lat": 31.95376472, "long": -89.23450472, "carriers": "UA" } … ] [ { "_id": { "carriers": "BA" }, "count": 10 }, { "_id": { "carriers": "DL" }, "count": 10 } … ] airports2 $unwind $group
- 18. Hub airports – try1
- 19. Hub airports – try2
- 20. Hub airports – try 3 { $group: { _id: { ORIGIN: "$ORIGIN", CARRIER: "$CARRIER" }, count: { $sum: 1 } } }, { $project: { airport: "$_id.ORIGIN", carrier: "$_id.CARRIER", "count": 1 } }, { $match: { "count": { $gte: "$$hub_threshold" } } }, { $group: { _id: { airport: "$airport" }, airlines: { $sum: 1 }, flights: { $sum: "$count" }, avg_airline: { $avg: "$count" }, max_airline: { $max: "$count" } } }, { $project: { "airlines": 1, "flights": 1, "avg_airline": 1, "max_airline": 1, "avg_no_max": { $divide: [ { $subtract: [ "$flights", "$max_airline" ] }, "$airlines" ] } } }, { $sort: { "flights": -1 } }
- 21. Hub airports
- 22. From-to Insensitive { $group: { _id: { UNIQUE_CARRIER: "$UNIQUE_CARRIER", ORIGIN: "$ORIGIN", DEST: "$DEST" }, count: { $sum: 1 } } }, { $match: { "count": { $gt: "$$count_threshold" } } }, { $project: { _id_UNIQUE_CARRIER: "$_id.UNIQUE_CARRIER", "count": 1, rroute: { $cond: [ { $lt: [ { $cmp: [ "$_id.ORIGIN", "$_id.DEST" ] }, 0 ] }, { $concat: [ "$_id.ORIGIN", "$_id.DEST" ] }, { $concat: [ "$_id.DEST", "$_id.ORIGIN" ] } ] } } }, { $group: { _id: { _id_UNIQUE_CARRIER: "$_id_UNIQUE_CARRIER", rroute: "$rroute" }, _sum_count: { $sum: "$count" } } }
- 23. Hub visualization (using routes – from/to, $$count=1, origin treemap)
- 24. Using “R” for Advanced Analytics • Using a MongoDB driver for “R” • Using the JSON Studio Gateway (including using aggregation output) install.packages("jSonarR") library(’jSonarR') con2 <- sonarR::new.SonarConnection('https://localhost:8443', 'localhost', 'flights', port=47017, username="ron", pwd=”<pwd>”) nyc_by_day <- sonarR::sonarAgg(con2, 'delays_by_day', 'NYCFlights', colClasses=c(X_avg_AirTime='numeric', X_avg_ArrDelay='numeric',X_avg_DepDelay='numeric')) lm.out = lm(nyc_by_day$X_sum_ArrDelay ~ nyc_by_day$X_sum_AirTime) MongoDB
- 25. Recommendation engine example: jsonstudio.com
- 26. NYC Flights – Quiz Questions • Of the three airports, who has the most flights? – Nyc1 • Who has the most cancellations and highest cancellation ratio? – Nyc2 • Taxi in/out times? – Nyc3 • What about delays? – Nyc4 • How do delays differ by month? – Nyc5 + nyc5 – (summer vs. winter / bubble size vs. y-axis) • What about weather delays only? Which months are worse? Are the three airports equivalent? – Nyc7 + nyc7 • Where can I fly to if I work for Boeing and am very loyal (and on which aicraft)? – Nyc8 + map
- 27. www.jsonstudio.com (download – presentation and eval copy) Discount code: MUGTX* (* Good for 1 month after event) [email protected]