NUS-VASu-Boat
VAST 2008 Challenge
Mini Challenge 2:
Migrant Boats (geo-temporal analysis)
Authors and Affiliations:
Chidansh Bhatt, National University
of Singapore, chidansh@comp.nus.edu.sg [PRIMARY
contact]
Dhaval Patel, National University of Singapore,
dhaval@comp.nus.edu.sg [PRIMARY contact]
Mohan
Kankanhalli, National University of Singapore,
mohan@comp.nus.edu.sg
Wynne Hsu, National University of
Singapore, whsu@comp.nus.edu.sg
Lee Mong Li, National University
of Singapore, leeml@comp.nus.edu.sg
Student team: YES
Supervisors : [Mohan Kankanhalli, Wynne Hsu, Lee Mong
Li]
Tool(s):
We use Google
earth as a tool for visualizing the latitude-longitude location data. We again
perform window based temporal analysis for characterizing the changing behavior
of the boats. To visualize on google earth we need .kmz files which
are generated using GPS Visualizer (
http://www.gpsvisualizer.com/map?form=googleearth ). We have given a set of kmz files utilized
to obtain the final results. We have provided a presentation
for better understanding.
Two Page Summary: No
ANSWERS:
Boat-1 Characterize the choice of
landing sites and their evolution over the three years.
Detailed Answer:
Fig.1 First 100 Landings in 2005 and 2006 Fig.2 Second 100 Landings in 2006 Fig3. Third 100 Landings in 2007 Fig4. Fourth 100 Landings in 2007
The number with color and different symbols represents the geographical location ( latitude and longitude) in date sorted order of landing boats records from 1 to 441. Where the 1 to 47 represents the landing in 2005, 48 to 177 landing in 2006 and 178 to 441 landings in 2007. The number of landings are increasing over the time period and there is explicit change in the landing pattern. We can see that earlier landing in 2005 were at the bottom part of shown part of US say Florida Bay, Miami, Naples etc. Over the years it shifted more towards upper part of the state like Spring Hill, Palm Bay, Cocoa Beach. These change in pattern can be due to two reasons (1) As the coast guards found that many migrant boats at lower part of the Florida state has landed in 2005 they increase the patrolling at lower parts. and (2) As the correlation with interdiction pattern, we will see below in answer 2. The coast guard over the years might have learn that there are many migrant boats from the Isla del Sueno Island and thus they might have started heavy patrolling over the route to Isla del sueno. These resulted in migrants taking outer path which enforces them to travel easily to the upper parts of the state.
Boat-2 Characterize the
geographical patterns of interdiction over the three years
Short Answer:
Fig 1. Interdictions in 2005 Fig 2. Interdictions in 2006 Fig 3. Interdictions in 2007
Again the figure represents the time sorted data with numbers and different symbols on google earth. In connection with observed landing patterns above we can see that there were more interdiction cases at southern part of the state. That was the place where migrants were landed successfully and thus that was the area of patrolling. But as the pattern of landing shifted and particularly coast guards realize that there are many migrant boats from Isla del sueno island and thus they increase the patrolling surrounding the island over the years.
Boat- 3 What is the successful
landing rate over the time period?
Short Answer:
The successful landing rate in 2005 was 47 landing records out of 152 records = 30.92%, in 2006 129 landing records out of 299 records = 43.14% and in 2007 266 landing records out of 466 records = 57.08%.