Change Default Geomap Zooming

Topojson files sometimes include small geographies that negatively impact how the library determines the default zoom level (for example, a small island or territory far off the coast that is barely visible to the eye). The fitFilter method can be used to remove specific geographies from the logic used to determine the zooming, in this case removing small islands, like Guam and American Samoa, and removing Alaska in order to focus on the 48 contiguous US states.

var popData = [{id: "01", population: 4830620}, {id: "02", population: 733375}, {id: "04", population: 6641928}, {id: "05", population: 2958208}, {id: "06", population: 38421464}, {id: "08", population: 5278906}, {id: "09", population: 3593222}, {id: "10", population: 926454}, {id: "11", population: 647484}, {id: "12", population: 19645772}, {id: "13", population: 10006693}, {id: "15", population: 1406299}, {id: "16", population: 1616547}, {id: "17", population: 12873761}, {id: "18", population: 6568645}, {id: "19", population: 3093526}, {id: "20", population: 2892987}, {id: "21", population: 4397353}, {id: "22", population: 4625253}, {id: "23", population: 1329100}, {id: "24", population: 5930538}, {id: "25", population: 6705586}, {id: "26", population: 9900571}, {id: "27", population: 5419171}, {id: "28", population: 2988081}, {id: "29", population: 6045448}, {id: "30", population: 1014699}, {id: "31", population: 1869365}, {id: "32", population: 2798636}, {id: "33", population: 1324201}, {id: "34", population: 8904413}, {id: "35", population: 2084117}, {id: "36", population: 19673174}, {id: "37", population: 9845333}, {id: "38", population: 721640}, {id: "39", population: 11575977}, {id: "40", population: 3849733}, {id: "41", population: 3939233}, {id: "42", population: 12779559}, {id: "44", population: 1053661}, {id: "45", population: 4777576}, {id: "46", population: 843190}, {id: "47", population: 6499615}, {id: "48", population: 26538614}, {id: "49", population: 2903379}, {id: "50", population: 626604}, {id: "51", population: 8256630}, {id: "53", population: 6985464}, {id: "54", population: 1851420}, {id: "55", population: 5742117}, {id: "56", population: 579679}, {id: "72", population: 3583073}];

new d3plus.Geomap()
  .config({
    data: popData,
    groupBy: "id",
    colorScale: "population",
    topojson: "https://d3plus.org/topojson/states.json",
    fitFilter: function(d) {
      return ["02", "15", "43", "60", "66", "69", "72", "78"].indexOf(d.id) < 0;
    }
  })
  .render();