Entry Name:  " HKUST-Siwei-GC"

VAST 2015 Challenge
Grand Challenge



Team Members:

Si Wei Fu, Hong Kong University of Science and Technology, fusiwei339@gmail.com PRIMARY

Shao Yu Chen, Hong Kong University of Science and Technology, schenan@connect.ust.hk

PURI Abishek, Hong Kong University of Science and Technology, apuri@connect.ust.hk

Tian Yu Wang, Hong Kong University of Science and Technology, twangad@connect.ust.hk

Yeuk Yin Chan, Hong Kong University of Science and Technology, yychanae@connect.ust.hk

Dong yu Liu, Hong Kong University of Science and Technology, ustdongyu@gmail.com

Hua min Qu, Hong Kong University of Science and Technology, huamin@cse.ust.hk



Student Team:  YES


Did you use data from both mini-challenges?  YES


Analytic Tools Used:

ParkVis, developed by student team led by HKUST VisGroup for the challenge


Approximately how many hours were spent working on this submission in total?

100 hours


May we post your submission in the Visual Analytics Benchmark Repository after VAST Challenge 2015 is complete?




Video Download





For each of the following questions, consider both the movement and communications data.

GC.1Scott is not a paying customer and does not have an ID. Describe Scott Jones’ activities in the park during the three-day weekend. Who does he spend most of his time with? When does he arrive? When does he leave? What route does he follow?

Limit your response to no more than 10 images and 1000 words.

Although we don’t have the ID and movement data of Scott Jones, we found a group of 8 people who are very special and we infer that they are his bodyguards or assistant. We think that their path should be the same as Scott Jones’ path.


As shown in Figure 1, in the MDS view, they are outliers of 3-day visitors. They go to the park on all 3 days but never check-in at any rides. They also don’t have any communication data from the Group View. As shown in Figure 2, they follow the same route each day, and arrive and leave the stage at the same time. The time they arrive at the Stage is the same as the time that visitors start to check-in at the stage. Also, it is strange that they don’t check-in at the stage although they stay at there for a long time. We think the only explanation can be that they’re the bodyguards or assistants of Scott Jones.

Figure 1 MDS View and Group View for those 8 people

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Figure 2 Map View for those 8 people

Then, we can infer that Scott Jones’ path will be virtually identical to these eight people, whose IDs are 521750, 644885, 1080969, 1600469, 1629516, 1781070, 1787551, and 1935406. From the movement data of the 8 people, we can know Scott Jones’ activity in the park. He arrives at the park at 8:45am and 1:45pm. He leaves the park at 12:15am and 5:15pm. The route he follows is the same on all 3 days, arriving at the stage at 9:30am, 2:30pm and leaves the stage at 11:30am, 4:30pm respectively. However, Scott Jones and his team don’t come to the park in the afternoon on Sunday, which differs from the plan that Scott was scheduled to appear in two stage shows each on Friday, Saturday, and Sunday to talk about his life and career. Therefore, Scott Jones follows the route as the picture shown above.


GC.2 – Identify up to 8 issues with park operations during the three-day weekend.  Provide a rationale for your answers.

Limit your response to no more than 8 images and 800 words.

1)      According to Park Chief of Security Barney Wojciehowicz, Creighton Pavilion was closed and locked up tight before each show. During closure of the Pavilion, the security should make sure that no one hides in the Pavilion. At that time, normally no visitor will stay in the Pavilion. However, 2 people check-in and stay at the Pavilion during the closure on Sunday. They are our prime suspects because they stay at the Pavilion for more than 1 hour after the closure and no one can witness what they do at that time.

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Figure 3 Traffic of Pavilion on both Saturday and Sunday

2)      The park security needs to check if there is any visitor still in the park before closure of the park. Otherwise, it will provide a chance for the criminal to commit the crime. As shown in Figure 4, the person whose id is 657863 has no check-in at entrance on Sat. His movement data starts from the pathway before Scholtz Express, which is far away from any entrance. He went to North Gate and went out of the park directly. Maybe he found that all gates had been closed when he tried to leave so he stayed at the park for a whole night. If the criminal wants to commit the crime, he also can stay in the park after it closes. Then his movement will not be recorded and no visitor can witness the crime.

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Figure 4 A visitor stays over night in the park.

3)      From Figure 5 we can infer that the Pavilion was forced to close at 12:00am on Sunday since no one can check-in at Pavilion after that, however some visitors still stayed in the Pavilion until 12:30am as displayed in Figure 6. The park security should ask all the visitors to leave the Pavilion immediately to prevent the evidence of the crime from being destroyed by the visitors.

Figure 5 Hotness of the Pavilion check-in point over time on Sunday

Figure 6 Population of the Pavilion on Sunday

4)      When Scott Jones’s talk ends, about 1000 visitors will leave the stage area in less than 10 minutes. This cause a large crowd and extra security is needed. The park management should find a way to prevent all the visitors at the stage area to leave in the same time so that they can save some security and deploy them to Pavilion.

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Figure 7 Population of the Stage area on Sunday


GC.3 – For the crime, describe the following, and provide your rationale:

a.       When did the crime occur?

b.       Where did the crime take place?

c.       Who are the most likely suspects in the crime?

Limit your response to no more than 5 images and 500 words.



The Creighton Pavilion.

According to the Mako Harrison, staff reporter, the crime forced partial closure of DinoFun World. The Creighton Pavilion was the only place that was closed.



The crime most likely occurred during 10:00am – 11:30am on Sun.

(1)   As shown in Figure 8, some normal visitors will stay in the Pavilion until 10:00am. Time before 10:00am is not a good time to commit the crime since it will be witnessed.

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Figure 8 Population of Pavilion on Sunday over time

(2)   According to the check-in records at Pavilion (Figure 5), the Pavilion was closed after 12:00am. According to the Mako Harrison, staff reporter, the closure was because of the crime. Hence, the crime must have occurred and discovered before 12:00am.

(3)   There is a traffic peak in Pavilion at 11:30am-12:00am on Sunday (Figure 8). But on Friday and Saturday, there are few people in Pavilion at 11:30am-12:00am (Figure 3). This also indicates something unusual happens before 11:30am.


We can infer that the crime most likely occurred at 10:00am – 11:30am on Sun. According to the Mako Harrison, staff reporter, extra security was needed at the Stage area to ensure visitor safety at that time. At 10:00am – 11:30am, no security and visitor is in the Pavilion. It is a good time to commit the crime, if they can stay in the Pavilion.



The 3 people whose IDs are 416790, 461004 and 1502920.

These 3 people check-in at the Pavilion at 9am and stayed there until 11:30am (Map View in Figure 10). They had enough time to commit the crime. Also, 416790, 461004 were still in the Pavilion during the closure and 1502920 one was the last one that check-in at the Pavilion before the closure. They all had 2 continuous check-in records at the Creighton Pavilion. For the ID 416790 and 461004, they have 3 continuous records that include two check-ins at the Pavilion at 09:01am and 11:30am and one movement record indicating their leave at Pavilion 18 seconds later. In addition, their check-in at 11:30 is the first check-ins in the park. We infer that the second check-in record should be like a check-out record. To hide 416790 and 461004 in the Pavilion, 1502920 checks out earlier to draw the security’s attention.

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Figure 9 When users select a timestamp, brush an area, visitors that stay in that area at the timestamp will be highlighted. Three suspects keep staying at Pavilion from 10:31 to 11:21 are highlighted in both (a) and (b). This picture shows how we identify the suspects.

1502920 sent a message to external at 10:20 and 416790 sent external message at 10:47 (Figure 10). This may be the time that crime started and crime ended.

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Figure 10 Map View shows a long check-in period of 416790 while the MDS View shows an external connection of ID 416790





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