perthmap_property_prices_bubbles

This map shows Perth Metro area with bubbles overlaid as median property prices(2017) and change in(%) per year for each suburb.

To see visualization in the browser check this https://bl.ocks.org/olgabradford/a0543ac36651eab394fe117580679baa

Design

Geojson file of all WA suburbs was downloaded from https://data.gov.au/dataset/wa-suburb-locality-boundaries-psma-administrative-boundaries Than boundaries of suburbs were simplified (resampled) to achieve a smaller size of a file with (http://mapshaper.org/) Mapshaper.org is a handy free online tool that allows to upload a geojson file, display it as a map, then choose one of three simplification alogrithims which can adjust the strength of with a slider. So, WA MAP path was simplified without loosing too much detail for quicker visualization purposes. Only Perth Metropolitan suburbs + Mandurah are displayed in current visualization.

Data sources

GEOJSON map of WA suburbs is from https://data.gov.au/dataset/wa-suburb-locality-boundaries-psma-administrative-boundaries Median house prices and changes in house prices in % are from REIWA

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
  <script src="https://d3js.org/d3.v3.min.js"></script>
  <script src="https://d3js.org/topojson.v2.min.js"></script>
<script src="https://d3js.org/d3-transition.v1.min.js"></script>
<script src="https://d3js.org/d3-drag.v1.min.js"></script>
  <script src="https://d3js.org/d3-zoom.v1.min.js"></script>
    <style> 
      circle {
        fill: orange;
        stroke: black;
        stroke-width: 1.5;
        opacity: 0.3;
      }

h2 {
        text-align:  center;
        color: black;

}
      h3 {
        text-align:  center;
        color: black;

}

div.price_buttons {
          position: fixed;
          top: 5px;
          left: 50px;    
      }

div.price_buttons div {
          background-color: rgb(251,201,127);
          padding: 3px;
          margin: 7px;
      }

</style>
      
    <title>Perth Property analytics</title>

d3.getEvent = () => require("d3-selection").event;

function draw(geo_data) {
        "use strict";
        var margin = 25,
            width = 1200 - margin,
            height = 1900 - margin;
    //        width = 1200 - margin,
   //         height = 1900 - margin;

d3.select('body')
          .append("h2")
          .text("Median Perth house prices in 2017 and annual change in %");

var zoomExtent = d3.zoom().scaleExtent([1, 20]);  
        function zoom() {
             g.attr("transform", d3.event.transform)
           }
       //circles
        var svg = d3.select("body")
            .append("svg")
            .attr("width", width + margin)
            .attr("height", height + margin)
            .call(d3.behavior.zoom().on("zoom", function () {
                 svg.attr("transform", "translate(" + d3.event.translate + ")" + " scale(" + d3.event.scale + ")")
                 }))
            .append('g')
            .attr('class', 'map');

// to better position a map use scale and translate
        var projection=d3.geo.mercator()
                              .center([115.6,-31.5])  //center of the map. coordinates around perth -31 lift map up from -30
                              .scale(90000) //zoom
                              .translate([width/20, height/20]);  //move center of the map

var path = d3.geo.path().projection(projection);
   //     debugger;
   //     var zoomExtent = d3.zoom().scaleExtent([1, 20]);

//    function zoom() {
     //          g.attr("transform", d3.event.transform)
    //     }
        var map = svg.selectAll('path')
                      .data(geo_data.features)
                      .enter()
                      .append('path')
                      .attr('d', path)
                      //changing fill of the maps from black
                      .style('fill', 'lightblue')
                      .style('stroke', 'black')
                      .style('stroke-width', 0.5)
                      .call(zoomExtent
                           .on("zoom", zoom))
                      ;
        //all good till here
     //   debugger;

//define an array of perth_suburb

var perth_suburb=["Alexander Heights","AlfredCove","Alkimos","Applecross","Ardross","Armadale","Ascot","Ashfield",
                 "Attadale","Atwell","Aveley",
"Balcatta","Balga","Ballajura","Bassendean","Bateman","Bayswater","Beaconsfield","Beckenham","Bedford","Bedfordale",
                 "Beechboro","Beechina","Beeliar","Beldon","Bellevue","Belmont","Bentley","Bertram","BibraLake",
                 "Bickley","Bicton","Booragoon","Boya","Brentwood","Bullsbrook",
"Brigadoon","Brookdale","Bull Creek","Bullsbrook","Burns Beach", "Burswood","Butler","Byford","Camillo",
"Calista","CanningVale","Cannington","Cardup","Carine","Carlisle","Carmel","Carramar","Casuarina",
                 "Caversham","ChampionLakes","Carabooda","Carramar",
"Churchlands","City Beach","Claremont","Clarkson","Cloverdale","Como","Connolly","Coogee","Coolbellup",
                 "Coolbinia","Cooloongup",
"Cottesloe","Craigie","Crawley","Currambine",
"Daglish","Dalkeith","Darch","Darling Downs","Darlington","Dianella","Doubleview","Duncraig",
"East Cannington","East Fremantle","East Perth","East Victoria Park","Eden Hill","Edgewater",
                 "Ellenbrook", "Embleton","Eglinton",
            "Ferndale","Floreat","Forrestdale","Forrestfield","Fremantle",
"Gnangara","Girrawheen","Glen Forrest","Glendalough","Gooseberry Hill","Gosnells","Greenmount","Greenwood",
                 "Guildford","Gwelup",
"Hamersley","Hamilton Hill","Hazelmere","Heathridge","Helena Valley","Henley Brook","High Wycombe",
                 "Highgate","Hillarys","Hillman","Hilton","Hocking","Hovea","Huntingdale",
"Iluka","Inglewood","Innaloo",
                 "Jandakot","Jindalee","Jolimont","Joondalup","Joondanna","Jandabup",
"Kalamunda","Kallaroo","Karawara","Kardinya","Karrinyup","Kelmscott","Kensington","Kenwick","Kewdale",
                 "Kiara","Kingsley", "Kings park", "Kinross","Koondoola","Koongamia",
"Landsdale","Langford","Lathlain","Leda","Leederville","Leeming","Lesmurdie","Lockridge","Lynwood",
"Maddington","Madeley","Mahogany Creek","Maida Vale","Manning","Marangaroo","Mariginup","Marmion",
"Martin","Maylands","Medina","Melville","Menora","Merriwa","Middle Swan","Midland","Midvale","Millendon",
"Mindarie","Mirrabooka","Morley","Mosman Park","Mount Claremont",
"Mount Hawthorn","Mount Lawley","Mount Nasura","Mount Pleasant","Mount Helena","Mount Richon","Mullaloo",
"Mundaring","Mundijong","Munster","Murdoch","Myaree",
"Nedlands","Neerabup","Nollamara","Noranda","North Beach","North Fremantle","North Lake","North Perth",
                 "Northbridge","Novergup",
"Oakford","Ocean Reef","Oldbury","Orelia","Osborne Park",
"Padbury","Palmyra","Parkwood","Parmelia","Pearsall","Peppermint Grove Beach","Perth","Pickering Brook",
                 "Piesse Brook","Port Kennedy",
"Queens Park","Quinns Rocks",
"Redcliffe","Ridgewood","Riverton","Rivervale","Rockingham","Roleystone","Rossmoyne",
"Safety Bay","Salter Point","Samson","Scarborough","Secret Harbour","Seville Grove","Shelley",
"Shenton Park","Shoalwater","Sinagra",
"Singleton","Sorrento","South Fremantle","South Guildford","South Lake","South Perth","Southern River",
                 "Spearwood",
"St James","Stirling","Stratton","Subiaco","Success","Swan View","Swanbourne",
"Tamala park","Tapping","The Vines","Thornlie","Trigg","Tuart Hill","Two Rocks",
"Upper Swan","Victoria Park","Viveash","Waikiki","Walliston","Wandi","Wanneroo","Warnbro","Warwick",
                 "Waterford","Watermans Bay","Wangara",
"Wattle Grove","Wattleup","Wellard","Wembley","Wembley Downs","West Leederville","West Perth",
                 "West Swan",
"Westminster","White Gum Valley","Willagee","Willetton","Wilson","Winthrop",
                 "Woodbridge","Woodlands",
"Woodvale","Yanchep","Yangebup","Yokine"];
    
  //console.log(perth_suburb); all good, array loaded

function plot_data(data) {
      //draw circles based on price range
     //  debugger;
      function median_price(leaves) {
       var median_price = d3.mean(leaves, function(d) {
        return d['med_price_2017'];
       });  
    //   debugger;
        //longitude using map function - transforms every element of an array and transforms an array
        var coords=leaves.map(function(d) {
          return projection([+d.long, +d.lat]); //projectionis like scale
        });

//   debugger;
        //calculate mean function
        //x element is first elemtn of array d[0]
        var center_x = d3.mean(coords, function(d) {
                 return d[0];
        });
       //y element is second element of array d[1]
        var center_y = d3.mean(coords, function(d) {
                 return d[1];
        }); 
    //    debugger;            
        return {
            'med_price_2017': median_price,
            'x': center_x, //x - pixel coordinate
            'y': center_y,  //y - pixel coordinate
      //      'perth_suburb': perth_suburb
               };
        }  //closed function median_price
      //  debugger;
        var nested = d3.nest()
                            .key(function(d) {
                              return d['perth_suburb'];
                            })
                            .rollup(median_price)  //aggregation
                            .entries(data); //passes data throw nested pipeline
            //work out maximum price out of all suburbs
            var med_2017_max = d3.max(nested, function(d) {
              return d.values['med_price_2017']
            });
         //   debugger;
            //convert median house price to pixels
            var radius = d3.scale.sqrt()  //area = pi*r^2
                            .domain([0, med_2017_max])
                            .range([0,10]);
         //   debugger;
            function key_func(d) {
              return d['key'];
            }

svg.append('g')
              .attr("class", "bubble")
              .selectAll("circle")
              //sorting data to avoid missing smaller overlapping data samples

.data(nested.sort(function(a, b){ 
                  return b.values['med_price_2017'] - a.values['med_price_2017'];
               }), key_func) 
              .enter().append("circle")
               .style("fill", "blue")     
              //place circles and set their radii to value of 5
              .attr('cx', function(d) {return d.values['x']; }) //set center x values
              .attr('cy', function(d) {return d.values['y']; }) //set center y values
              .attr('r', function(d) {
                   return radius(d.values['med_price_2017']) //set radius
          //    .append("h2")
          //    .text("test")

})
           //   .append("h3")
           //   .text("test")
              ;

function text_suburb(leaves) {
         var text_suburb = function(d) {
         return d.values['perth_suburb'];
         };  
       //  var text_suburb = (leaves, function(d) {
       //  return d['perth_suburb'];
       //  });

//   debugger;
        //longitude using map function - transforms every element of an array and transforms an array
        var coords_t=leaves.map(function(d) {
          return projection([+d.long, +d.lat]); //projectionis like scale
        });

//   debugger;
        //calculate mean function
        //x element is first elemtn of array d[0]
        var ct_x = d3.mean(coords_t, function(d) {
                 return d[0];
        });
       //y element is second element of array d[1]
        var ct_y = d3.mean(coords_t, function(d) {
                 return d[1];
        }); 
    //    debugger;

return {
            'x': ct_x, //x - pixel coordinate
            'y': ct_y,  //y - pixel coordinate
            'perth_suburbt': perth_suburb.values()
               };
        }  //closed function median_price
        
        var tnested = d3.nest()
                            .key(function(d) {
                              return d['perth_suburb'];
                            })
                            .rollup(text_suburb)  //aggregation
                            .entries(data); //passes data throw nested pipeline
                         
       //     function key_func(d) {
     //         return d['key'];
     //       }

svg.append('g')
              .attr("class", "text")
              .selectAll("text")
              .data(tnested)
              //sorting data to avoid missing smaller overlapping data samples

//     .data(nested.sort(function(a, b){ 
         //         return b.values['med_price_2017'] - a.values['med_price_2017'];
        //      }), key_func) 
                   
              .enter()
              .append("text")
              //place circles and set their radii to value of 5
              .attr('x', function(d) {return d.values['x']; }) //set center x values
              .attr('y', function(d) {return d.values['y']; }) //set center y values
            //  .text(JSON.stringify(tnested))
             // .text( function(d) {return d.values['perth_suburbt']; })
              .text( function(d) {return d.key; })
              .attr("font-family", "sans-serif")
              .attr("font-size", "8px")
              .attr("fill","black")       ;
          //    .append("h2")
          //    .text("test")

//START ANIMATION, display percentages of change in house value

//remove old circles

function median_percent(leaves) {

var median_percent = d3.mean(leaves, function(d) {
        return d['buble_change'];
       });  
 //      debugger;
        //longitude using map function - transforms every element of an array and transforms an array
        var coordsb=leaves.map(function(d) {
          return projection([+d.long, +d.lat]); //projectionis like scale
        });

//      debugger;
        //calculate mean function
        //x element is first elemtn of array d[0]
        var center_xb = d3.mean(coordsb, function(d) {
                 return d[0];
        });
       //y element is second element of array d[1]
        var center_yb = d3.mean(coordsb, function(d) {
                 return d[1];
        });

svg.append('g')
  //            .transition()
   //           .duration(1000)
              .attr("class", "bubble")
              .selectAll("circle")
              //sorting data to avoid missing smaller overlapping data samples

.data(nestedb.sort(function(a, b){ 
                  return b.values['buble_change'] - a.values['buble_change'];
               }), key_func) 
                   
              .enter().append("circle")
                .style("fill", "#F2D1D4")
              //place circles and set their radii to value of 5
              .attr('cx', function(d) {return d.values['xb']; }) //set center x values
              .attr('cy', function(d) {return d.values['yb']; }) //set center y values
              .attr('r', function(d) {
                   return radiusb(d.values['med_percent']) //set radius
          //    .append("h2")
          //    .text("test")

})
           //   .append("h3")
           //   .text("test")
              ;

}

d3.tsv("buble_percent2.tsv", function(d) {   //loadind house price data
        d['med_price_2017'] = +d['med_price_2017'];
          return d;
        }, plot_data);  //pass data to plot_points function
   
    };
   
      </script>
  </head>
<body>
<script type="text/javascript">

d3.json("geojson_final_perth_metro.json", draw);  //list of suburbs is not yet complete geojson format, suburbs and polygons
</script>
</body>
</html>

https://code.jquery.com/jquery-3.2.1.slim.min.js

https://d3js.org/d3.v3.min.js

https://d3js.org/topojson.v2.min.js

https://d3js.org/d3-transition.v1.min.js

https://d3js.org/d3-drag.v1.min.js

https://d3js.org/d3-zoom.v1.min.js