IS428-AY2019-20T1 HDBViz-Proposal

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Hdbviz-final.png


 

Proposal

 

Poster

 

Application

 

Research Paper


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Problem Statement

Problem: Our team has identified a lack of information on HDB resale flats for home-buyers who want to understand and make decisions on the type of HDB flat to buy based on past transaction trends.

Motivation: With the increasing demand for housing, there is a need for homeowners to have a better understanding of the flats they are purchasing. Hence, there is a need to analyse the resale prices and transaction volume of the flats.

Objectives

Target: Home Buyers
In this project, we aim to create a visualization tool that helps homeowners make decisions by identifying:

  • Changes of resale prices by flat types, years and month
  • Value of the house based on the estate area
  • Resale transaction price based on the age of the estate area (lease year)
  • Identify Estates that are worth buying

Selected Data Sets

Dataset/Source Data Attributes Rationale of Usage

HDB Resale Flat Prices
(https://data.gov.sg/dataset/resale-flat-prices)

  • Month
  • Town
  • Flat Type
  • Block
  • Street Name
  • Storey Range
  • Floor Area Sqm
  • Flat Model
  • Lease Commence Date
  • Remaining Lease
  • Resale Price

To gain information on the HDB procurement over the years such as:

  • The Resales prices by flat type
  • Area size and Floor level and;
  • The lease date of the flat.

Background Survey of Related Work

Reference of Other Interactive Visualization What we Learnt

Title: HDB One Map
Onemap.png

Source: https://services2.hdb.gov.sg/web/fi10/emap.html

  • Shows detailed information on HDB flats but lacks the tool to show an overview on the HDB estates in Singapore
  • It is usability is limited by its lack of function to filter by different data variables e.g. region, street, Model, Floor Range, Floor Area and etc.

Title: SRX Heat Map
SRX Heatmap.png

Source: https://www.srx.com.sg/heat-map

  • Shows an overview of the price and transaction volume of the different types of estate in different towns.
  • Bad color scheme used
  • Could include more interactive elements to the chart & detailed information (eg when hover over a district can show price & no. of transactions)

Title: Line Chart
Linegraph.png

Source: https://www.teoalida.com/singapore/hdbprices/

  • Able to see the trend in a glance based on the different flat type
  • Messy, not interactive as it does not show any highlight line when users hover over to the town that they want to see

Title: Horizon Chart
Horizon.png

Source: https://flowingdata.com/2015/07/02/changing-price-of-food-items-and-horizon-graphs/

  • It allows users to look at patterns over time
  • It does not come with any axis or bounds which makes it easy to implement
  • Horizon chart also supports mouse interaction when hovered or selected in the chart.
  • It makes use of colour based code to separate positive and negative values
  • It collapses the negative values to the positive side of the axis, taking up less space and shows the same data.

Title: Tree-Map
Treemap Resale.png

Source: http://rpubs.com/tskam/treemap

  • Main benefits of tree maps is that they make efficient use of compact space, so they can legibly display many items on the screen at the same time.
  • But tree-maps with too many items tend to be hard to read because of the many lines that enclose each small node.

Title: Overlay BarChart
OverlayBarchart.png

Source: https://blogs.sas.com/content/graphicallyspeaking/2014/07/27/overlay-bar-charts/

  • Overlay Bar-chart reduces the chances of frequency measurement error.

Proposed Dashboard

Our group has proposed the following storyboard in our Visual Application:

Dashboards Rationale

Dashboard 1: Overview
Proposed treemap.jpg
  • An overview to show the Resale Prices and Transaction Volumes for the different flat types by region and town, in a hierarchy structure.
  • The size of the box will be based on the total transaction volume and the colour will be based on the median transaction price.
  • The chart can be filtered by time and the tree-map will be updated according to the filter.

Dashboard 2: Price/Transaction Volume Dashboard
Dashboard 2.1.jpg
  • A horizon Chart to show the Resale Prices or Transaction Volumes by Towns.
  • When Filtered to Resale Prices and Selected Town, the right graph will display a Line chart. It will show the absolute Resale price of the selected town and the changes of Resale price from the previous year to the current year.
  • When filtered by Transaction Volume, it will show the absolute Transaction Volume of the selected town and changes of transaction volume from the previous year to the current year.

Dashboard 3: Past HDB Resale Transactions
Dashboard3.jpg
  • The user will apply filters on the price range, lease year, flat type and flat model which will be reflected by the proportional map and heat-map accordingly
  • The proportional map’s symbol size is determined by the number of transactions within each town
  • The heat-map shows the median past transaction prices by town and flat type
  • The heat-map shade intensity is determined by the median transaction price
  • Upon hovering over the points on the proportional map, it will show a box plot with the distribution of the transaction prices by the specific town

Key Technical Challenges

Challenges Action Taken

Unfamiliarity with R and the different packages required to build the visualizations

Explore online resources (e.g. Rpubs) Self-learn on Data-camp

Lack ideas in designing the storyboard

Explore online resources such as Tableau Public Library to gather insights and inspirations

Retrieving the coordinates for the different town required to build a map for our visualization

Look into various projects and examples that made use of geographical mapping as reference

Tools and Technologies Used

Archi.png

Milestones

Milestones.png

References

http://freerangestats.info/blog/2018/05/13/nz-govt-shinyapps
http://rpubs.com/tskam/treemap
https://public.tableau.com/profile/yslin#!/vizhome/HDBResalePrice_OverallTrend/DB_OverviewofHDBResalePrice

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