{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "Vector array map showing wind speed and direction.",
  "background": "white",
  "padding": 5,
  "width": 615,
  "height": 560,
  "data": [
    {
      "name": "source_0",
      "url": "data/windvectors.csv",
      "format": {
        "type": "csv",
        "parse": {"longitude": "number", "latitude": "number"}
      },
      "transform": [
        {
          "type": "geojson",
          "fields": ["longitude", "latitude"],
          "signal": "geojson_0"
        },
        {
          "type": "geopoint",
          "projection": "projection",
          "fields": ["longitude", "latitude"],
          "as": ["x", "y"]
        },
        {
          "type": "filter",
          "expr": "isValid(datum[\"dir\"]) && isFinite(+datum[\"dir\"]) && isValid(datum[\"speed\"]) && isFinite(+datum[\"speed\"])"
        }
      ]
    }
  ],
  "projections": [
    {
      "name": "projection",
      "size": {"signal": "[width, height]"},
      "fit": {"signal": "geojson_0"},
      "type": "equalEarth"
    }
  ],
  "marks": [
    {
      "name": "marks",
      "type": "symbol",
      "style": ["point"],
      "from": {"data": "source_0"},
      "encode": {
        "update": {
          "opacity": {"value": 0.7},
          "shape": {"value": "wedge"},
          "fill": {"scale": "color", "field": "dir"},
          "x": {"field": "x"},
          "y": {"field": "y"},
          "size": {"scale": "size", "field": "speed"},
          "angle": {"scale": "angle", "field": "dir"}
        }
      }
    }
  ],
  "scales": [
    {
      "name": "color",
      "type": "linear",
      "domain": [0, 360],
      "range": {"scheme": "rainbow"},
      "interpolate": "hcl",
      "zero": true
    },
    {
      "name": "size",
      "type": "linear",
      "domain": {"data": "source_0", "field": "speed"},
      "range": [0, 500],
      "zero": true
    },
    {
      "name": "angle",
      "type": "linear",
      "domain": [0, 360],
      "range": [180, 540],
      "zero": true
    }
  ],
  "legends": [
    {
      "size": "size",
      "symbolType": "wedge",
      "title": "speed",
      "encode": {
        "symbols": {
          "update": {
            "fill": {"value": "black"},
            "fillOpacity": {"value": 0.7},
            "opacity": {"value": 0.7},
            "stroke": {"value": "transparent"}
          }
        }
      },
      "aria": false
    }
  ],
  "config": {"aria": false, "style": {"cell": {"fill": "black"}}}
}