Heatmap spec for google mobility data

heatmap-google-mobility-spec.json

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "Mobility changes for different aspects in Indian regions",
  "width": 750,
  "height": 700,
  "padding": 5,
  "title": {
    "text": "India regional mobility changes",
    "anchor": "middle",
    "fontSize": 16,
    "font": "Monospace",
    "offset": 4
  },
  "data": [
    {
      "name": "mobility",
      "url": "https://gist.githubusercontent.com/bkamapantula/2b15fec42c4971ea02cc45167a4847ab/raw/b218004907f237a85b65cbee29555253e478e48f/google-mobility-data.json",
      "format": {
        "parse": "auto",
        "type": "json"
      },
      "transform": [
        {"type": "filter", "expr": "datum[Property] != null"}
      ]
    }, {
      "name": "annotation",
      "values": [
        {
          "start": "2020-03-25",
          "end": "2020-04-14",
          "text": "Lockdown 1"
        }, {
          "start": "2020-04-15",
          "end": "2020-05-03",
          "text": "Lockdown 2"
        }, {
          "start": "2020-05-04",
          "end": "2020-05-17",
          "text": "Lockdown 3"
        }, {
          "start": "2020-05-18",
          "end": "2020-05-31",
          "text": "Lockdown 4"
        }
      ],
      "format": {
        "parse": {"start": "date", "end": "date"}
      }
    }
  ],
  "signals": [
    {
      "name": "Property",
      "value": "residential_percent_change_from_baseline",
      "bind": {
        "input": "select",
        "options": [
          "retail_and_recreation_percent_change_from_baseline",
          "grocery_and_pharmacy_percent_change_from_baseline",
          "parks_percent_change_from_baseline",
          "transit_stations_percent_change_from_baseline",
          "workplaces_percent_change_from_baseline",
          "residential_percent_change_from_baseline"
        ]
      }
    },
    {
      "name": "Color",
      "value": "RedYellowGreen",
      "bind": {
        "input": "select",
        "options": [
          "BlueOrange",
          "BrownBlueGreen",
          "PurpleGreen",
          "PinkYellowGreen",
          "PurpleOrange",
          "RedBlue",
          "RedGrey",
          "RedYellowBlue",
          "RedYellowGreen"
        ]
      }
    },
    {
      "name": "colorReverse", "value": false, "bind": {"input": "checkbox"}
    }
  ],
  "scales": [
    {
      "name": "x",
      "type": "time",
      "domain": {"data": "mobility", "field": "date"},
      "range": "width"
    },
    {
      "name": "y",
      "type": "band",
      "domain": {"data": "mobility", "field": "sub_region_1"},
      "range": "height"
    },
    {
      "name": "color",
      "type": "linear",
      "range": {"scheme": {"signal": "Color"}},
      "domain": {"data": "mobility", "field": {"signal": "Property"}},
      "reverse": {"signal": "colorReverse"}
    },
    {
      "name": "acolor",
      "type": "ordinal",
      "domain": {"data": "annotation", "field": "text"},
      "range": ["black"]
    }
  ],
  "axes": [
    {"orient": "bottom", "scale": "x", "domain": false, "title": "Day",
    "labelFont": "monospace", "titleFont": "monospace"},
    {"orient": "left", "scale": "y", "domain": false, "title": "Region",
    "labelFont": "monospace", "titleFont": "monospace"}
  ],
  "legends": [
    {
      "fill": "color",
      "type": "gradient",
      "title": {"signal": "Property"},
      "titleFontSize": 12,
      "titlePadding": 4,
      "gradientLength": {"signal": "height - 16"},
      "titleFont": "monospace",
      "titleOrient": "right",
      "orient": "left"
    }
  ],
  "marks": [
    {
      "type": "rect",
      "from": {"data": "mobility"},
      "encode": {
        "enter": {
          "x": {"scale": "x", "field": "date"},
          "y": {"scale": "y", "field": "sub_region_1"},
          "width": {"value": 5},
          "height": {"scale": "y", "band": 1},
          "tooltip": {
            "signal": "timeFormat(datum.date, '%b %d') + ',' + datum.sub_region_1 + ' - ' + Property + ': '+ datum[Property]"
          }
        },
        "update": {
          "fill": {
            "scale": "color",
            "field": {"signal": "Property"}
          },
          "tooltip": {
            "signal": "timeFormat(datum.date, '%b %d') + ',' + datum.sub_region_1 + ' - ' + Property + ': '+ datum[Property]"
          }
        }
      },
      "zindex": 9
    },
    {
      "type": "rect",
      "from": {"data": "annotation"},
      "encode": {
        "enter": {
          "x": {"scale": "x", "field": "start"},
          "x2": {"scale": "x", "field": "end"},
          "y": {"value": 0},
          "y2": {"signal": "height + 50"},
          "fill": {"scale": "acolor", "field": "text"},
          "opacity": {"value": 0.09}
        }
      }
    },
    {
      "type": "text",
      "from": {
        "data": "annotation"
      },
      "encode": {
        "enter": {
          "x": {"scale": "x", "field": "start"},
          "y": {"signal": "height + 60"},
          "text": {"field": "text"}
        }
      }
    }
  ]
}