vega.hjson

{
   "$schema": "https://vega.github.io/schema/vega/v3.0.json",
   "config": {
     "kibana": {
       "type": "map",
       "latitude": 37.77,
       "longitude": -122.45,
       "zoom": 12,
       "mapStyle": "default",
       "minZoom": 5,
       "maxZoom": 17,
       "zoomControl": true,
       "delayRepaint": true,
       "controlsDirection": "horizontal"
     }
   },
   "data": [
     {
       "name": "ships",
       "url": {
         "index": "ships-*",
         "body": {
           "query": {
            "bool": {
              "must": [
                { "exists": { "field": "location" } },
                { "exists": { "field": "mmsi" } },
                { "range": {"curtime": {"%timefilter%": true}} }
              ]
            }
           },
           "size": 10000
         }
       }
       "format": { "type": "json", "property": "hits.hits" },
       "transform": [
          {
            "type": "geopoint",
            "projection": "projection",
            "fields": [
              {"expr": "datum._source.location.lon"},
              {"expr": "datum._source.location.lat"}
            ],
            "as": ["x", "y"]
          },
          {
            "type": "formula",
            "expr": "if (datum._source.dim_a != null && datum._source.dim_b != null && datum._source.dim_c != null, log(1 + datum._source.dim_a + datum._source.dim_b + datum._source.dim_c) * 10, 100)"
            "as": "shipsize"
          },
          {
            "type": "formula",
            "expr": "datum._source.mmsi % 20"
            "as": "shipcolor"
          },
          {
            type: "formula",
            expr: "if (datum._source.name != null, datum._source.name, 'Unnamed')",
            as: "shipname"
          },
          {
            type: "formula",
            expr: "if (datum._source.true_heading != null, datum._source.true_heading, 'Unnamed')",
            as: "heading"
          }
       ],
     },
   ],
   scales: [
    {
      "name": "shipcolorscale",
      "type": "ordinal",
      "domain": {"data": "ships", "field": "shipcolor"},
      "range": { "scheme": "category20" }
    }
  ],
    "marks": [
      {
          "type": "text",
          "from": {"data": "ships"},
          "encode": {
            "update": {
              "x": {"signal": "datum.x"},
              "y": {"signal": "datum.y"},
              "text": { "value": "⏏" },
              "fontSize": { "signal": "datum.shipsize" },
              "fill": { "scale": "shipcolorscale", "field": "shipcolor" },
              "align": { "value": "center" },
              "fontWeight": { "value": "bold" },
              "angle": { "signal": "datum.heading" },
              "tooltip": { "signal": "datum.shipname" },
            }
            "hover": {
              "fill": {"value": "red"},
              "tooltip": { "signal": "datum.shipname" }
            }
          }
      }
    ]
}