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MAKING VISIBLETHE INVISIBLETHE L TRAIN CLOSURE
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AGENDAProblem de�nitionCurrent statusProposed solutionTechnology
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ABOUT USCartoDB: location intelligence SaaSSince 2011~100 employeesO�ces in Madrid, NYC and Tartu~200K users
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PROBLEMDEFINITION
After Sandy hurricane, the NY Canarsie tunnel wasa�ectedAuthorities (MTA) are planning to shut down the Ltrain lineThis situation can last yearsHow this line shutdown will a�ect to New Yorkers?
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OVERVIEW THE L TRAIN
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OVERVIEW THE L TRAIN
Major connection between Manhattan an Brooklyn~27.000 passenger per workday (2014 data)With its modern signaling, L line can have moretrains
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CURRENT STATUS
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DATA AVAILABLEDemographics from
Home and work dynamics from
American Community Survey(ACS)
LODESL entrances
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ANALYSIS
Objective: study the relation betweenpeople from Brooklyn commuting to
Manhattan and the L line.
Census blocks as base geographic informationRelation with L entrances using walking route and travel time
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WALKING PATHS
Map of number of Brooklyn walkers using L train within a 30 minutes range
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COMMUTING TIME
~500K people from Brooklyn work at Manhattan~200K L Train commuters per day~114K use the L train to work at Manhattan
People try to live close to their jobs
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SCENARIOCLOSING THE CANARSIE
TUNNEL
AFFECTED POPULATION
L is the closest line for ~19K low incomehouseholds
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AFFECTED POPULATION
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AFFECTED POPULATION
Most a�ected areas would be Brownsville and East New YorkMore wealthy population can look for other transport methods (uber, lyft)MTA suggested bus shuttles
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PROPOSEDSOLUTION
Bus shuttles to substitute the Canarsietunnel
Williamsburg to Lower East Side~20 minutes rideIs it worth?
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BUS SHUTTLE: BEST CHOICE?
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BUS SHUTTLE: BEST CHOICE?
Shuttle is the best choice for ~75.000 riders per day
1154 bus rides (65 pax/bus)One bus every 90 secondsThis almost means NYC needs a new bridge!!
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INCREASING BUS TIME
Shuttle are only interesting if they take less than 29minutesThen all commuters would better use M line
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TECHNOLOGY
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CARTODB AS AN ANALYSISPLATFORM
Postgres + PostGISMapzen Valhalla routing exposed as SQL functionsCustom python functions embedded
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CARTODB DATA SERVICES APIExpose third party services through SQL:
Geocoding: Mapzen, HERE, GoogleRouting: MapzenTrade Areas: HERE
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EXAMPLE: GEOCODING +ROUTING
SELECT st_transform(shape, 3857) as the_geom_webmercator FROM cdb_route_point_to_point( cdb_geocode_street_point('Calle Moreno Nieto, 2, 28005 Madrid'), cdb_geocode_street_point('fernandez de la hoz 35, madrid'), 'car', ARRAY['mode_type=shortest']::text[] )
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TECHNOLOGY: GEOCODING +ROUTING
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LOOKINGFORWARD
A beter UIReference dataMore analysis functions, beyond PostGISBetter LDS
For everyone, everything athttps://github.com/CartoDB/
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THANKS!MAKING VISIBLE THE
INVISIBLE: THE L TRAIN CLOSURE
Jorge Sanz · · [email protected] @xurxosanz
