Dobong-gu(Seoul) Safety-info Map

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Where is Dobong-gu?

http://www.openstreetmap.org/

Seoul Cityhall

Dobong-gu

K-hotel

Seoul

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Citizen Participation

+

BigData Analysis

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Project Process

Map-based

Survey

Dataset

Consturction

Data

Analysis

(Text-mining)

Spot

Inspection

Step 1 Step 2

Step 3

Step 4

Data

Analysis

(Hotspot)

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Map-based

Survey

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Map-based survey Process

Production the questionnaire Carrying out the survey Gathering completed papers

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Map-based survey form

1. Please draw your main walkway to school using red marker

2. Please mark a location where your child may feel danger using blue marker and describe the reason

*Please refer to attached example map

Drive too fast

Adult stuff

Dark road,Need more lights

Teenagers smoke

Busy street(too many vehichles)

Traffic signal violation

Need CCTV

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Raw data example

Illegal parking

“Dangerous spot”

Streetlamp doesn’t work

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Raw data example

No answer…

No traffic light

Bus & bicycleCollision

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Dataset

Consturction

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Convert from RAW DATA in A3 PAPER to VECTOR SHAPE FILE

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Example: “Way to school”

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Example: students and their parents compliant

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Results

3,247 Children

School walkway

= 1,766 km

= 1,097 mile

2,932 Children

danger consciousness

area

= 14.3 km2

= 3,533 ac

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Survey Data = BigData ?

http://map.meurisse.org/

Shanghai

Seoul

Osaka

1,766 km > 1,707 km

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Data

Analysis

(Text-mining)

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Text-mining analysis method

Adding Sorting & Extract

Subtract Change Visualizing

Subtract Extract &Transaction

AssociationRule

Visualizing

Related keywords (using R library – Assosication rule)

Top Keyword (using R library – Word Cloud)

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Top Keyword Analysis (using R library – Word Cloud)

Rank Keyword Freq. ratio

1 Many cars 1,731 13.4%

58.9%

2 Drive too fast 664 5.1%

3 Dark 653 5.1%

4 Traffic light 638 4.9%

5 Signal violation 619 4.8%

6 CCTV 531 4.1%

7 Night 462 3.6%

8 Unfrequented 419 3.2%

9 Teenager 368 2.8%

10 sidewalk 359 2.8%

11 Illegal parking 276 2.1%

12 Alley 268 2.1%

13 Entry and exit 240 1.9%

14 Crossroad 208 1.6%

15 Crosswalk 185 1.4%

16~312 And many others 4,918 41.1%

Total 12,914 100%

312 Keywords, 12,914 frequencies

Top 15 Keywords form 59% (other 297 keywords form 41%)

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Differences between each primary school

Ga-in Nuwon Dobong Baekwoon Sungmi

Shinbanghak shinhakshinchang Shinwha Ssangmun

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Differences between each primary school

Obong Wolchon Jaun Changkyung Changdo

Changdong Changrim Changwon Changil Chodang

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Related keywords (using R library - Assosication rule)

“because taxi drivers who heavily smoke always gather together

here”

“sometimes full-size-car or trucks are reversing when

children go to school”

Why they think ‘supermarket’ dangerous?

“Understanding the keywords in the context”

‘Taxi driver’

Smoking

teenager

Full-size-car

supermarket

Raw sentence

Raw sentence

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Typology of the dangerous situation for children based on text analysis

Too many cars

Apartment, supermarket, shopping arcade, driving

school, church

Bad drivers

Illegal U-turn, drive too fast, lane violation

Want to avoid situation

Smoking, drinking, sex offender, trenchcoat, middle school student

Worry about injury

Under the construction, warehouse, wild pig,

landslip, noise, exhaust

Harmful points

Night spot, bar, adult

stuff, illegal flyer

View, interrupted

trees, reflector, banner,

standing signboard,

illegal parking

Mixed traffic flow

Narrow sidewalk, double

park, underpass, side

streets

Transport infrasturcture

Traffic light, complex

traffic sign, flashing

signal, left turn signal,

crosswalk

Hard to notice

Narrow alley, need alarm,

unfrequented, small

park, dark

9 types of situations and keywords

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Compare responses using 9 types

Too many cars

23%

Bad drivers

16%

Want to avoid situation

4%

Worry about injury

3%

Harmful points

1%

View, interrupted

11%

Mixed traffic flow

9%

Transport infrasturcture

15%

Hard to notice

16%

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Differences between each primary school (examples)

TA23.0 16.0 11.4

4.4 1.3 9.0

3.5 16.0 15.3

Legend Too manycars

Baddrivers

View,Interrup

ted

Want toAvoid

HarmfulPoints

Mixed traffic flow

WorryAboutinjury

Hard tonotice

Transp.infra

Bsch.

18.0 18.4 5.2

8.0 10.4 2.4

4.4 23.2 10.0

Asch.

24.6 10.6 10.0

5.6 0.6 14.4

3.8 22.6 7.9

Csch.

12.6 30.4 9.3

4.5 0.4 8.1

2.4 18.8 13.6

Harmful points

Hard to notice

Mixed traffic flow

Hard to notice

Bad drivers

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GIS Analysis – Hotspot extract process

Step 1 Step 2 Step 3 Step 4

Insert 9 column

(dangerous situation type)

and write binary value

Relative evaluation

each grid cell

Recheck keywords and

sentence in hotspot of

each 9 type

Summarized Safety

Information map!

(Safety-info map)

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Labeling all complaints using QGIS…

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Step 1. insert 9 column(dangerous situation type) and write binary value

type1 type2 type3 type4 type5 type6 type7 type8 type9

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Step 1. insert 9 column(dangerous situation type) and write binary value

All type ‘Want to avoid situation’ ‘bad drivers’

‘hard to notice’ ‘too many cars’

…

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Step 2. Relative evaluation each grid cell

Divide each school area into GRID (10 x 10 meter) Spatial Join (GRID + Responses, find sum of binary value)

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Step 2. Relative evaluation each grid cell

Result of evalutation each grid cell

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Step 2. Relative evaluation each grid cell

‘Too many cars’

‘Hard to notice’

‘Want to avoid situation’

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Step 3. Recheck keywords and full sentence in hotspot of each 9 type

“Hard to notice” Hotspot

Recheck keywords in hotspot

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Step 3. Recheck keywords and sentence in hotspot of each 9 type

“Transport Infrastructure” Hotspot

Recheck keywords in hotspot

Cherry-pick top keyword in hotspot

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+ evaluate main school walkway

Ga-in Primary School – main school walkway

also use spatial join (GRID + walkway polyline shape file) …

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Step 4. Summarized Safety Information map! (Safety-info map)

Type 1~5 Type 6~9

(We designed map manually like tour map…)

Worry injury

Bad drivers

Want avoid

Many cars

Harmful

Hard to notice

Tranp. Infra

Mixed flow

View, interrupted

Under construction

Taxi firm

juvenile delinquent

dark, unfrequentLED lingts, CCTV needed

Illegal parking

No traffic signal

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Spot

Inspection

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Officers carried out spot inspection (1)

CCTV

Streetlamp Reflector

Narrow road

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Officers carried out spot inspection (2)

After inspection, recheck safety-info map Result of inspection

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Thank You for Listening

GIS United Inc.

http://gisutd.com