Flow maps visualize directional movement between geographic locations using lines or arrows drawn on a map projection. Line width, opacity, or color typically encodes the magnitude of the flow. Common applications include migration patterns, trade routes, supply chains, commuter traffic, and data packet routing.

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value
82000
61000
45000
73000
38000
56000
49000
71000

{
  "data": [
    {
      "fromLon": -118.24,
      "fromLat": 34.05,
      "toLon": -87.63,
      "toLat": 41.88,
      "value": 82000,
      "label": "LA â†’ Chicago"
    },
    {
      "fromLon": -118.24,
      "fromLat": 34.05,
      "toLon": -122.42,
      "toLat": 37.77,
      "value": 61000,
      "label": "LA â†’ SF"
    },
    {
      "fromLon": -118.24,
      "fromLat": 34.05,
      "toLon": -80.19,
      "toLat": 25.77,
      "value": 45000,
      "label": "LA â†’ Miami"
    },
    {
      "fromLon": -87.63,
      "fromLat": 41.88,
      "toLon": -74,
      "toLat": 40.71,
      "value": 73000,
      "label": "Chicago â†’ NYC"
    },
    {
      "fromLon": -87.63,
      "fromLat": 41.88,
      "toLon": -95.37,
      "toLat": 29.76,
      "value": 38000,
      "label": "Chicago â†’ Houston"
    },
    {
      "fromLon": -74,
      "fromLat": 40.71,
      "toLon": -118.24,
      "toLat": 34.05,
      "value": 56000,
      "label": "NYC â†’ LA"
    },
    {
      "fromLon": -74,
      "fromLat": 40.71,
      "toLon": -80.19,
      "toLat": 25.77,
      "value": 49000,
      "label": "NYC â†’ Miami"
    },
    {
      "fromLon": -122.42,
      "fromLat": 37.77,
      "toLon": -118.24,
      "toLat": 34.05,
      "value": 71000,
      "label": "SF â†’ LA"
    }
  ],
  "series": [
    {
      "type": "flowmap",
      "fromLonKey": "fromLon",
      "fromLatKey": "fromLat",
      "toLonKey": "toLon",
      "toLatKey": "toLat",
      "valueKey": "value"
    }
  ],
  "title": {
    "text": "US Domestic Migration Flows"
  }
}

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A flow map draws lines or arrows from origin to destination coordinates, with line width or color encoding the flow magnitude. This example shows domestic migration between major US cities.

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