Difference between revisions of "IS428 AY2018-19T1 Tian Seet Yuen"

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The following Dashboard is designed to tackle Task 2 specifically:
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== Task 1: Spatio-temporal Analysis of Official Air Quality==
 
== Task 1: Spatio-temporal Analysis of Official Air Quality==

Revision as of 15:33, 11 November 2018

Problem & Motivation

Air pollution is an important risk factor for health in Europe and worldwide. A recent review of the global burden of disease showed that it is one of the top ten risk factors for health globally. Worldwide an estimated 7 million people died prematurely because of pollution; in the European Union (EU) 400,000 people suffer a premature death. The Organisation for Economic Cooperation and Development (OECD) predicts that in 2050 outdoor air pollution will be the top cause of environmentally related deaths worldwide. In addition, air pollution has also been classified as the leading environmental cause of cancer.

Air quality in Bulgaria is a big concern: measurements show that citizens all over the country breathe in air that is considered harmful to health. For example, concentrations of PM2.5 and PM10 are much higher than what the EU and the World Health Organization (WHO) have set to protect health.

Bulgaria had the highest PM2.5 concentrations of all EU-28 member states in urban areas over a three-year average. For PM10, Bulgaria is also leading on the top polluted countries with 77 μg/m3on the daily mean concentration (EU limit value is 50 μg/m3).

According to the WHO, 60 percent of the urban population in Bulgaria is exposed to dangerous (unhealthy) levels of particulate matter (PM10).

Data Exploration and Preparation

Official Air Quality Dataset

EEA Data

Firstly, let's look at the Official Air Quality data. According to the metadata, there are 6 stations - Nadezhda, Hipodruma, Druzhba, Orlov Most, IAOS/Pavlovo and Mladost. All datasets were merged together into a single csv file.

The important variables are as follow:

  1. AirQualityStationEoICode
  2. CommonName
  3. AirPollutant
  4. AveragingTime
  5. Concentration
  6. DateTime
  7. Longitude
  8. Latitude
Problem #1 Missing Values
Issue Upon further inspection, data for Year 2016 - 2018 were missing for Orlov Most station, and data for Year 2013 - 2017 were missing for Mladost. Meanwhile, data from Jan 2017 to Oct 2017 were missing for all stations.
Solution Since the main goal is to visualize the overall characteristics of air quality in Sofia City, Orlov Most station was excluded completely since most of its data is missing. However, the remaining stations remained included in the EDA process to discover potential patterns and insights.
Problem #2 Different AveragingTime formats
Issue In this set of timeseries data, there appears to be different AveragingTime formats of PM10 concentration values. In total, there are 3 different formats - 1. Day 2. Var 3. Hour. To illustrate, data for Year 2016 - 2018 are mostly recorded in Hour or Var format.
Solution The datasets will be separated into two formats: Daily and Hourly. Firstly, Var values were converted to Hour values by deducting 1 hour from the Var values. Next, to convert Hour values to Day values, the mean for Hour values in each Day was computed. With that, we have two sets of data - Daily and Hourly.

Citizen Science Air Quality Dataset

Air Tube

Next, let's explore the Citizen science Air Quality measurements. Firstly, there were 2 datasets - one for 2017 and another for 2018. After which, both datasets were combined together, via a notebook written in R.

R Notebook to combine datasets.png
Problem #1 Tableau unable to read 11-character Geohash values
Issue In the datasets, 11-character geohash was used to provide geographical details. However, Tableau is unable to read these values.
Solution R Notebook was utilized to generate the latitude and longitude values according to these geohash values. After which, these values were combined to the current dataset as new columns.
R geo decode.png

Interactive Visualization and Design

Task 1 Filter bar
Due to the vast amount of visualizations intended to tackle Task 1, squeezing all visualizations within one sheet would result in an overly-cluttered dashboard and thus, not ideal. As such, icons were created to allow users to navigate across sheets to view visualizations for different purposes.
Design2
This geographical map acts as a filter to allow users to attain a good sense of the Station’s geographical location. Upon hovering over the circle, a tooltip appears to represent the station’s name. Sheets within the dashboard are dynamic to this filter, and this allows user to possibly draw insights between geographical differences and PM10 values.
Design3
Reference lines are added to this density plot, to allow users to immediately see where the PM10 measurement lies within. The ranges follow the Air Quality Index given by EEA. Source: http://airindex.eea.europa.eu/. Reference lines are also color coded to represent the danger of PM10 values, whereby “Good” is color coded as dark green and “Very Poor” is color coded as bright red, which signifies danger.
Design4
Upon hovering, the tooltip tells you immediately the AQI category and Average concentration value for the PM10 measurement.
Design5
This line chart is also color coded based on the AQI category. Viewers are able to tell immediately the trend of PM10 values based on hour.

The following Dashboard is designed to tackle Task 1 specifically:

Dashboard1
Dasboard1.2
Design6.png
Dashboard icons to allow viewers to navigate across sheet. Multiple sheets are used to prevent overly-cluttered graphs within a single sheet.
Design7.png
Slider allows viewer to toggle through each Month and observe and time dependent patterns.
Design8.png
Toggle for users to select measure and filter the graph based on interest.
Design9.png
Color-coded map which shows each Geohash as a coloured circle, according to its clustered region. This map also acts as a filter and highlight, to allow viewers to identify and geographical dependent patterns. Viewers are also able to select the Region based on the Legend shown.

The following Dashboard is designed to tackle Task 2 specifically:

Dashboard2.1.png

Task 1: Spatio-temporal Analysis of Official Air Quality


Task 2: Spatio-temporal Analysis of Citizen Science Air Quality Measurements


Task 3: Relationships and Causal Factors of Air Pollution


References


Comments