Data Models

bgt/Model/Routes.java

This class generally represents the OSM file in java context under this project.

Variables

• private Boundaries boundaries;
• private List wayList= new ArrayList<>();
• private List nodeList=new ArrayList<>();

Most Important functions

• public void resegmentWays(double LOW_THRES, double HIGH_THRES){…}

Most Important functions

None

bgt/Model/Node.java

Variables

Represents a Node in standard OSM format in java context under this project.

• public static int numOfGenNodes = 0; Counter for number of nodes
• public long id;
• public double lat;
• public double lon;
• public String visible= “true”;
• public String ref=”untyped”;

Most Important functions

• public static double toRad(double coord){return coord/180.0*Math.PI;} - Convert coordinate(Latitude/Longitude) into radian
• public static double calcDist(double aLat, double aLon, double bLat, double bLon){…} - Calculate the distance between two points
• public static double calcDist(Node aNode, Node bNode){…} - Calculate the distance between two points

bgt/Model/Way.java

Represents a WAy in standard OSM format in java context under this project.

Variables

• public long id;
• public List nodeList;
• public boolean isBridge;
• public boolean isTunnel;
• public String name;
• public String name_en;
• public String name_zh;
• public boolean isOneWay; - This is true for all
• public static final double LOW_THRES = 50.0;
• public static final double HIGH_THRES = 100.0;

Most Important functions

• public List resegmentWay(double LOW_THRES,double HIGH_THRES){...} -In 1 way, changes the distances between its nodes so each distance bewteen nodes would be roughly equal.

bgt/Model/Segment.java

Variables

• public String seg_id; - 22371280_0_0
• public long way_id; $\equiv$ to route id.
• public int inner_id;// id inside a way differing on from other
• public Node startNode;
• public Node endNode;
• public double direction;
• public int startHour; - what the fuck is this . In our model, this shit is always = 0..
• public List recordList;
• public List accList;

Most Important functions

• public void calcSeg_id() {this.seg_id = way_id +”“+inner_id+””+ startHour; // generate segment i;}
• public void calcDirection(){ // calculate the azimuth of the segment } Triggered at constructor when creating the segment at
• public Segment[] splitSegByHour(){

bgt/Model/Grid.java

Variables

• private Boundaries boundaries;
• private GridElement[][] listGrid;

Most Important functions

public Routes convertToRoutes(int rowID, int colID) Helps to print out Grid as routes

bgt/Model/GridElement.java

Variables

• Position boundaries
  • final double LON_MIN;
  • final double LON_MAX;
  • final double LAT_MIN;
  • final double LAT_MAX;
• private List segmentList=new ArrayList();

Most Important functions

bgt/MapMatching/Accident.java

Variables

• public int acc_no;
• public int severity;
• public int month;
• public int day;
• public double acc_time;
• public Node acc_location;

Most Important functions

bgt/MapMatching/Record.java

Variables

• public long rec_id;
• public int dev_id;
• public int month;
• public int day;
• public double time;
• public Node location;
• public double speed; // in km/h
• public double direction;
• public String seg_id; - this.seg_id = way_id +”“+inner_id+””+ startHour;
• public int acc_flag; // whether encounter an accident or not

Most Important functions

bgt/IncidentDetection/Models/EvaluateResult

Used to keep anomaly values and whether there is accident

Variables

• public double anomaly_val;
• public double anomaly_val_weighted;
• public int acc_label;

Most Important functions

bgt/IncidentDetection/Models/LabeledRecord

Store the record read in from labeling result file.

Variables

• public double time;
• public int speed;
• public int acc_flag; // 1 for accident, 0 for no accident

Most Important functions

bgt/IncidentDetection/Models/SegDistribution

Store the parameters that have been traines

Variables

• public static int NUM_MIXTURE; // number of traffic states
• public static double[] lambdas; // global parameter of each poisson distribution - total K
• public static double[][] deltas; // the pair-wise KL distance between states - some math jargon
• public String seg_id; // segment id this distribution parameters belong to
• public double[] pis; // weights for each state/poisson distribution in this segment
• public double[] sigmas; // prepared for weighted KL divergence - math jargon

bgt/Model/Boundaries.java

Variables

Based on the XML boundary attribute on top of every XML file

Example

 <bounds minlat="22.10531" minlon="113.78242" maxlat="22.60856"
maxlon="114.49179" origin="osmconvert 0.8.5"/>  

• private final double minlat;
• private final double maxlat;
• private final double maxlon;
• private final double minlon;
• private String origin=”osmconvert 0.8.5”;