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SafeWalk
Find your safest route for any time of day
Nishan Mann
Data Sources and Pipeline
NYC Open Data
Major Crimes
Dataset
2005-2016
(~1,000,000)
Algorithms
● Dijkstra Algorithm: between Start and End, find
the shortest path minimizing sum of weigths
● K-nearest neighours classification to associate
each crime with a road
d1
d4
d5
d2
d9
d3 d6
d8
d10
d12
d7
d11
Start
End
Cost Model for Road Lengths
Personal fear of crime Crime Costs depending
on hour and type of
crime
● De Sota Road, NY at 0300
App Landing Page
● Personal Fear of Crime: Rational, Almost rational, Borderline
irrational, Irrational, Paranoid
Brooklyn Safe Route at 0100
● Crime Avoidance Level : Neutral, Personal Fear of Crime: Rational
Cost Model Validation
Cost Model Validation (3rd
Party)
● Courtesy of Trulia
https://www.trulia.com/local/new-york-ny/tiles:1|
points:0_crime
Personal Fear of Crime: Rational
● Crime Avoidance Level: Vigilant
Personal Fear of Crime: Paranoid
● Crime Avoidance Level: Vigilant
About Me
● Physicist and motorcycle enthusiast
Insights
● NYC is pretty safe at any time of time of day
(Nice!)
● One’s perceived ‘fear’ of crime is one of the
major sources of route modifications
Demos!
● Brooklyn neutral Show time of day
● Port Harris Neutral vs Paranoid Show personal
fear of crime parameter
●
Exploratory Plot
● Time of day and type of crime matter

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