vega-lite-question 2

vega-lite-q2

{
  "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
  "width": "container",
  "height": "container",
  "data": {
    "url": "https://raw.githubusercontent.com/vda-lab/vda-lab.github.io/master/assets/station_366.json"
  },
  "transform": [
    {
      "filter": {"field": "endstation_id", "equal": "336"}
    }
  ],
  "selection": {
    "grid": {
      "type": "interval", "bind": "scales"
    }
  },
  "mark": "circle",
  "encoding": {
    "x": {"field": "startstation_longitude", "type": "quantitative","axis": {"title": "startstation_longitude, endstation_longitude"}},
    "y": {"field": "startstation_latitude", "type": "quantitative","axis": {"title": "startstation_latitude, endstation_latitude"}},
    "color": {
      "condition": {
        "test": "datum.startstation_longitude === -73.99906065 && datum.startstation_latitude === 40.73047747",
        "value": "red"
      }
  },
  "size":{
      "condition": {
        "test": "datum.startstation_longitude === -73.99906065 && datum.startstation_latitude === 40.73047747",
        "value": "300"
      }
  }
}
}