以上で完了です。

開発を始めるには、デベロッパー ドキュメント をご覧下さい。

Google Maps JavaScript API をアクティベートする

まず初めに Google Developers Console で次の作業を行います。

  1. プロジェクトを作成または選択する
  2. Google Maps JavaScript API と関連サービスをアクティベートする
  3. 適切なキーを作成する
続ける

Heatmaps

Read the documentation or view this example full screen.

// This example requires the Visualization library. Include the libraries=visualization
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=visualization">

var map, heatmap;

function initMap() {
  map = new google.maps.Map(document.getElementById('map'), {
    zoom: 13,
    center: {lat: 37.775, lng: -122.434},
    mapTypeId: 'satellite'
  });

  heatmap = new google.maps.visualization.HeatmapLayer({
    data: getPoints(),
    map: map
  });
}

function toggleHeatmap() {
  heatmap.setMap(heatmap.getMap() ? null : map);
}

function changeGradient() {
  var gradient = [
    'rgba(0, 255, 255, 0)',
    'rgba(0, 255, 255, 1)',
    'rgba(0, 191, 255, 1)',
    'rgba(0, 127, 255, 1)',
    'rgba(0, 63, 255, 1)',
    'rgba(0, 0, 255, 1)',
    'rgba(0, 0, 223, 1)',
    'rgba(0, 0, 191, 1)',
    'rgba(0, 0, 159, 1)',
    'rgba(0, 0, 127, 1)',
    'rgba(63, 0, 91, 1)',
    'rgba(127, 0, 63, 1)',
    'rgba(191, 0, 31, 1)',
    'rgba(255, 0, 0, 1)'
  ]
  heatmap.set('gradient', heatmap.get('gradient') ? null : gradient);
}

function changeRadius() {
  heatmap.set('radius', heatmap.get('radius') ? null : 20);
}

function changeOpacity() {
  heatmap.set('opacity', heatmap.get('opacity') ? null : 0.2);
}

// Heatmap data: 500 Points
function getPoints() {
  return [
    new google.maps.LatLng(37.782551, -122.445368),
    new google.maps.LatLng(37.782745, -122.444586),
    new google.maps.LatLng(37.782842, -122.443688),
    new google.maps.LatLng(37.782919, -122.442815),
    new google.maps.LatLng(37.782992, -122.442112),
    new google.maps.LatLng(37.783100, -122.441461),
    new google.maps.LatLng(37.783206, -122.440829),
    new google.maps.LatLng(37.783273, -122.440324),
    new google.maps.LatLng(37.783316, -122.440023),
    new google.maps.LatLng(37.783357, -122.439794),
    new google.maps.LatLng(37.783371, -122.439687),
    new google.maps.LatLng(37.783368, -122.439666),
    new google.maps.LatLng(37.783383, -122.439594),
    new google.maps.LatLng(37.783508, -122.439525),
    new google.maps.LatLng(37.783842, -122.439591),
    new google.maps.LatLng(37.784147, -122.439668),
    new google.maps.LatLng(37.784206, -122.439686),
    new google.maps.LatLng(37.784386, -122.439790),
    new google.maps.LatLng(37.784701, -122.439902),
    new google.maps.LatLng(37.784965, -122.439938),
    new google.maps.LatLng(37.785010, -122.439947),
    new google.maps.LatLng(37.785360, -122.439952),
    new google.maps.LatLng(37.785715, -122.440030),
    new google.maps.LatLng(37.786117, -122.440119),
    new google.maps.LatLng(37.786564, -122.440209),
    new google.maps.LatLng(37.786905, -122.440270),
    new google.maps.LatLng(37.786956, -122.440279),
    new google.maps.LatLng(37.800224, -122.433520),
    new google.maps.LatLng(37.800155, -122.434101),
    new google.maps.LatLng(37.800160, -122.434430),
    new google.maps.LatLng(37.800378, -122.434527),
    new google.maps.LatLng(37.800738, -122.434598),
    new google.maps.LatLng(37.800938, -122.434650),
    new google.maps.LatLng(37.801024, -122.434889),
    new google.maps.LatLng(37.800955, -122.435392),
    new google.maps.LatLng(37.800886, -122.435959),
    new google.maps.LatLng(37.800811, -122.436275),
    new google.maps.LatLng(37.800788, -122.436299),
    new google.maps.LatLng(37.800719, -122.436302),
    new google.maps.LatLng(37.800702, -122.436298),
    new google.maps.LatLng(37.800661, -122.436273),
    new google.maps.LatLng(37.800395, -122.436172),
    new google.maps.LatLng(37.800228, -122.436116),
    new google.maps.LatLng(37.800169, -122.436130),
    new google.maps.LatLng(37.800066, -122.436167),
    new google.maps.LatLng(37.784345, -122.422922),
    new google.maps.LatLng(37.784389, -122.422926),
    new google.maps.LatLng(37.784437, -122.422924),
    new google.maps.LatLng(37.784746, -122.422818),
    new google.maps.LatLng(37.785436, -122.422959),
    new google.maps.LatLng(37.786120, -122.423112),
    new google.maps.LatLng(37.786433, -122.423029),
    new google.maps.LatLng(37.786631, -122.421213),
    new google.maps.LatLng(37.786660, -122.421033),
    new google.maps.LatLng(37.786801, -122.420141),
    new google.maps.LatLng(37.786823, -122.420034),
    new google.maps.LatLng(37.786831, -122.419916),
    new google.maps.LatLng(37.787034, -122.418208),
    new google.maps.LatLng(37.787056, -122.418034),
    new google.maps.LatLng(37.787169, -122.417145),
    new google.maps.LatLng(37.787217, -122.416715),
    new google.maps.LatLng(37.786144, -122.416403),
    new google.maps.LatLng(37.785292, -122.416257),
    new google.maps.LatLng(37.780666, -122.390374),
    new google.maps.LatLng(37.780501, -122.391281),
    new google.maps.LatLng(37.780148, -122.392052),
    new google.maps.LatLng(37.780173, -122.391148),
    new google.maps.LatLng(37.780693, -122.390592),
    new google.maps.LatLng(37.781261, -122.391142),
    new google.maps.LatLng(37.781808, -122.391730),
    new google.maps.LatLng(37.782340, -122.392341),
    new google.maps.LatLng(37.782812, -122.393022),
    new google.maps.LatLng(37.783300, -122.393672),
    new google.maps.LatLng(37.783809, -122.394275),
    new google.maps.LatLng(37.784246, -122.394979),
    new google.maps.LatLng(37.784791, -122.395958),
    new google.maps.LatLng(37.785675, -122.396746),
    new google.maps.LatLng(37.786262, -122.395780),
    new google.maps.LatLng(37.786776, -122.395093),
    new google.maps.LatLng(37.787282, -122.394426),
    new google.maps.LatLng(37.787783, -122.393767),
    new google.maps.LatLng(37.788343, -122.393184),
    new google.maps.LatLng(37.788895, -122.392506),
    new google.maps.LatLng(37.789371, -122.391701),
    new google.maps.LatLng(37.789722, -122.390952),
    new google.maps.LatLng(37.790315, -122.390305),
    new google.maps.LatLng(37.790738, -122.389616),
    new google.maps.LatLng(37.779448, -122.438702),
    new google.maps.LatLng(37.779023, -122.438585),
    new google.maps.LatLng(37.778542, -122.438492),
    new google.maps.LatLng(37.778100, -122.438411),
    new google.maps.LatLng(37.777986, -122.438376),
    new google.maps.LatLng(37.777680, -122.438313),
    new google.maps.LatLng(37.777316, -122.438273),
    new google.maps.LatLng(37.777135, -122.438254),
    new google.maps.LatLng(37.776987, -122.438303),
    new google.maps.LatLng(37.776946, -122.438404),
    new google.maps.LatLng(37.776944, -122.438467),
    new google.maps.LatLng(37.776892, -122.438459),
    new google.maps.LatLng(37.776842, -122.438442),
    new google.maps.LatLng(37.776822, -122.438391),
    new google.maps.LatLng(37.776814, -122.438412),
    new google.maps.LatLng(37.776787, -122.438628),
    new google.maps.LatLng(37.776729, -122.438650),
    new google.maps.LatLng(37.776759, -122.438677),
    new google.maps.LatLng(37.776772, -122.438498),
    new google.maps.LatLng(37.776787, -122.438389),
    new google.maps.LatLng(37.776848, -122.438283),
    new google.maps.LatLng(37.776870, -122.438239),
    new google.maps.LatLng(37.777015, -122.438198),
    new google.maps.LatLng(37.777333, -122.438256),
    new google.maps.LatLng(37.777595, -122.438308),
    new google.maps.LatLng(37.777797, -122.438344),
    new google.maps.LatLng(37.778160, -122.438442),
    new google.maps.LatLng(37.778414, -122.438508),
    new google.maps.LatLng(37.778445, -122.438516),
    new google.maps.LatLng(37.778503, -122.438529),
    new google.maps.LatLng(37.778607, -122.438549),
    new google.maps.LatLng(37.778670, -122.438644),
    new google.maps.LatLng(37.778847, -122.438706),
    new google.maps.LatLng(37.779240, -122.438744),
    new google.maps.LatLng(37.779738, -122.438822),
    new google.maps.LatLng(37.780201, -122.438882),
    new google.maps.LatLng(37.780400, -122.438905),
    new google.maps.LatLng(37.780501, -122.438921),
    new google.maps.LatLng(37.780892, -122.438986),
    new google.maps.LatLng(37.781446, -122.439087),
    new google.maps.LatLng(37.781985, -122.439199),
    new google.maps.LatLng(37.782239, -122.439249),
    new google.maps.LatLng(37.782286, -122.439266),
    new google.maps.LatLng(37.797847, -122.429388),
    new google.maps.LatLng(37.797874, -122.429180),
    new google.maps.LatLng(37.797885, -122.429069),
    new google.maps.LatLng(37.797887, -122.429050),
    new google.maps.LatLng(37.797933, -122.428954),
    new google.maps.LatLng(37.798242, -122.428990),
    new google.maps.LatLng(37.798617, -122.429075),
    new google.maps.LatLng(37.798719, -122.429092),
    new google.maps.LatLng(37.798944, -122.429145),
    new google.maps.LatLng(37.799320, -122.429251),
    new google.maps.LatLng(37.799590, -122.429309),
    new google.maps.LatLng(37.799677, -122.429324),
    new google.maps.LatLng(37.799966, -122.429360),
    new google.maps.LatLng(37.800288, -122.429430),
    new google.maps.LatLng(37.800443, -122.429461),
    new google.maps.LatLng(37.800465, -122.429474),
    new google.maps.LatLng(37.800644, -122.429540),
    new google.maps.LatLng(37.800948, -122.429620),
    new google.maps.LatLng(37.801242, -122.429685),
    new google.maps.LatLng(37.801375, -122.429702),
    new google.maps.LatLng(37.801400, -122.429703),
    new google.maps.LatLng(37.801453, -122.429707),
    new google.maps.LatLng(37.801473, -122.429709),
    new google.maps.LatLng(37.801532, -122.429707),
    new google.maps.LatLng(37.801852, -122.429729),
    new google.maps.LatLng(37.802173, -122.429789),
    new google.maps.LatLng(37.802459, -122.429847),
    new google.maps.LatLng(37.802554, -122.429825),
    new google.maps.LatLng(37.802647, -122.429549),
    new google.maps.LatLng(37.802693, -122.429179),
    new google.maps.LatLng(37.802729, -122.428751),
    new google.maps.LatLng(37.766104, -122.409291),
    new google.maps.LatLng(37.766103, -122.409268),
    new google.maps.LatLng(37.766138, -122.409229),
    new google.maps.LatLng(37.766183, -122.409231),
    new google.maps.LatLng(37.766153, -122.409276),
    new google.maps.LatLng(37.766005, -122.409365),
    new google.maps.LatLng(37.765897, -122.409570),
    new google.maps.LatLng(37.765767, -122.409739),
    new google.maps.LatLng(37.765693, -122.410389),
    new google.maps.LatLng(37.765615, -122.411201),
    new google.maps.LatLng(37.765533, -122.412121),
    new google.maps.LatLng(37.765467, -122.412939),
    new google.maps.LatLng(37.765444, -122.414821),
    new google.maps.LatLng(37.765444, -122.414964),
    new google.maps.LatLng(37.765318, -122.415424),
    new google.maps.LatLng(37.763961, -122.415296),
    new google.maps.LatLng(37.763115, -122.415196),
    new google.maps.LatLng(37.762967, -122.415183),
    new google.maps.LatLng(37.762278, -122.415127),
    new google.maps.LatLng(37.761675, -122.415055),
    new google.maps.LatLng(37.760932, -122.414988),
    new google.maps.LatLng(37.759337, -122.414862),
    new google.maps.LatLng(37.773187, -122.421922),
    new google.maps.LatLng(37.773043, -122.422118),
    new google.maps.LatLng(37.773007, -122.422165),
    new google.maps.LatLng(37.772979, -122.422219),
    new google.maps.LatLng(37.772865, -122.422394),
    new google.maps.LatLng(37.772779, -122.422503),
    new google.maps.LatLng(37.772676, -122.422701),
    new google.maps.LatLng(37.772606, -122.422806),
    new google.maps.LatLng(37.772566, -122.422840),
    new google.maps.LatLng(37.772508, -122.422852),
    new google.maps.LatLng(37.772387, -122.423011),
    new google.maps.LatLng(37.772099, -122.423328),
    new google.maps.LatLng(37.771704, -122.423783),
    new google.maps.LatLng(37.771481, -122.424081),
    new google.maps.LatLng(37.771400, -122.424179),
    new google.maps.LatLng(37.771352, -122.424220),
    new google.maps.LatLng(37.771248, -122.424327),
    new google.maps.LatLng(37.770904, -122.424781),
    new google.maps.LatLng(37.770520, -122.425283),
    new google.maps.LatLng(37.770337, -122.425553),
    new google.maps.LatLng(37.770128, -122.425832),
    new google.maps.LatLng(37.769756, -122.426331),
    new google.maps.LatLng(37.769300, -122.426902),
    new google.maps.LatLng(37.769132, -122.427065),
    new google.maps.LatLng(37.769092, -122.427103),
    new google.maps.LatLng(37.768979, -122.427172),
    new google.maps.LatLng(37.768595, -122.427634),
    new google.maps.LatLng(37.768372, -122.427913),
    new google.maps.LatLng(37.768337, -122.427961),
    new google.maps.LatLng(37.768244, -122.428138),
    new google.maps.LatLng(37.767942, -122.428581),
    new google.maps.LatLng(37.767482, -122.429094),
    new google.maps.LatLng(37.767031, -122.429606),
    new google.maps.LatLng(37.766732, -122.429986),
    new google.maps.LatLng(37.766680, -122.430058),
    new google.maps.LatLng(37.766633, -122.430109),
    new google.maps.LatLng(37.766580, -122.430211),
    new google.maps.LatLng(37.766367, -122.430594),
    new google.maps.LatLng(37.765910, -122.431137),
    new google.maps.LatLng(37.765353, -122.431806),
    new google.maps.LatLng(37.764962, -122.432298),
    new google.maps.LatLng(37.764868, -122.432486),
    new google.maps.LatLng(37.764518, -122.432913),
    new google.maps.LatLng(37.763435, -122.434173),
    new google.maps.LatLng(37.762847, -122.434953),
    new google.maps.LatLng(37.762291, -122.435935),
    new google.maps.LatLng(37.762224, -122.436074),
    new google.maps.LatLng(37.761957, -122.436892),
    new google.maps.LatLng(37.761652, -122.438886),
    new google.maps.LatLng(37.761284, -122.439955),
    new google.maps.LatLng(37.761210, -122.440068),
    new google.maps.LatLng(37.761064, -122.440720),
    new google.maps.LatLng(37.761040, -122.441411),
    new google.maps.LatLng(37.761048, -122.442324),
    new google.maps.LatLng(37.760851, -122.443118),
    new google.maps.LatLng(37.759977, -122.444591),
    new google.maps.LatLng(37.759913, -122.444698),
    new google.maps.LatLng(37.759623, -122.445065),
    new google.maps.LatLng(37.758902, -122.445158),
    new google.maps.LatLng(37.758428, -122.444570),
    new google.maps.LatLng(37.757687, -122.443340),
    new google.maps.LatLng(37.757583, -122.443240),
    new google.maps.LatLng(37.757019, -122.442787),
    new google.maps.LatLng(37.756603, -122.442322),
    new google.maps.LatLng(37.756380, -122.441602),
    new google.maps.LatLng(37.755790, -122.441382),
    new google.maps.LatLng(37.754493, -122.442133),
    new google.maps.LatLng(37.754361, -122.442206),
    new google.maps.LatLng(37.753719, -122.442650),
    new google.maps.LatLng(37.753096, -122.442915),
    new google.maps.LatLng(37.751617, -122.443211),
    new google.maps.LatLng(37.751496, -122.443246),
    new google.maps.LatLng(37.750733, -122.443428),
    new google.maps.LatLng(37.750126, -122.443536),
    new google.maps.LatLng(37.750103, -122.443784),
    new google.maps.LatLng(37.750390, -122.444010),
    new google.maps.LatLng(37.750448, -122.444013),
    new google.maps.LatLng(37.750536, -122.444040),
    new google.maps.LatLng(37.750493, -122.444141),
    new google.maps.LatLng(37.790859, -122.402808),
    new google.maps.LatLng(37.790864, -122.402768),
    new google.maps.LatLng(37.790995, -122.402539),
    new google.maps.LatLng(37.791148, -122.402172),
    new google.maps.LatLng(37.791385, -122.401312),
    new google.maps.LatLng(37.791405, -122.400776),
    new google.maps.LatLng(37.791288, -122.400528),
    new google.maps.LatLng(37.791113, -122.400441),
    new google.maps.LatLng(37.791027, -122.400395),
    new google.maps.LatLng(37.791094, -122.400311),
    new google.maps.LatLng(37.791211, -122.400183),
    new google.maps.LatLng(37.791060, -122.399334),
    new google.maps.LatLng(37.790538, -122.398718),
    new google.maps.LatLng(37.790095, -122.398086),
    new google.maps.LatLng(37.789644, -122.397360),
    new google.maps.LatLng(37.789254, -122.396844),
    new google.maps.LatLng(37.788855, -122.396397),
    new google.maps.LatLng(37.788483, -122.395963),
    new google.maps.LatLng(37.788015, -122.395365),
    new google.maps.LatLng(37.787558, -122.394735),
    new google.maps.LatLng(37.787472, -122.394323),
    new google.maps.LatLng(37.787630, -122.394025),
    new google.maps.LatLng(37.787767, -122.393987),
    new google.maps.LatLng(37.787486, -122.394452),
    new google.maps.LatLng(37.786977, -122.395043),
    new google.maps.LatLng(37.786583, -122.395552),
    new google.maps.LatLng(37.786540, -122.395610),
    new google.maps.LatLng(37.786516, -122.395659),
    new google.maps.LatLng(37.786378, -122.395707),
    new google.maps.LatLng(37.786044, -122.395362),
    new google.maps.LatLng(37.785598, -122.394715),
    new google.maps.LatLng(37.785321, -122.394361),
    new google.maps.LatLng(37.785207, -122.394236),
    new google.maps.LatLng(37.785751, -122.394062),
    new google.maps.LatLng(37.785996, -122.393881),
    new google.maps.LatLng(37.786092, -122.393830),
    new google.maps.LatLng(37.785998, -122.393899),
    new google.maps.LatLng(37.785114, -122.394365),
    new google.maps.LatLng(37.785022, -122.394441),
    new google.maps.LatLng(37.784823, -122.394635),
    new google.maps.LatLng(37.784719, -122.394629),
    new google.maps.LatLng(37.785069, -122.394176),
    new google.maps.LatLng(37.785500, -122.393650),
    new google.maps.LatLng(37.785770, -122.393291),
    new google.maps.LatLng(37.785839, -122.393159),
    new google.maps.LatLng(37.782651, -122.400628),
    new google.maps.LatLng(37.782616, -122.400599),
    new google.maps.LatLng(37.782702, -122.400470),
    new google.maps.LatLng(37.782915, -122.400192),
    new google.maps.LatLng(37.783137, -122.399887),
    new google.maps.LatLng(37.783414, -122.399519),
    new google.maps.LatLng(37.783629, -122.399237),
    new google.maps.LatLng(37.783688, -122.399157),
    new google.maps.LatLng(37.783716, -122.399106),
    new google.maps.LatLng(37.783798, -122.399072),
    new google.maps.LatLng(37.783997, -122.399186),
    new google.maps.LatLng(37.784271, -122.399538),
    new google.maps.LatLng(37.784577, -122.399948),
    new google.maps.LatLng(37.784828, -122.400260),
    new google.maps.LatLng(37.784999, -122.400477),
    new google.maps.LatLng(37.785113, -122.400651),
    new google.maps.LatLng(37.785155, -122.400703),
    new google.maps.LatLng(37.785192, -122.400749),
    new google.maps.LatLng(37.785278, -122.400839),
    new google.maps.LatLng(37.785387, -122.400857),
    new google.maps.LatLng(37.785478, -122.400890),
    new google.maps.LatLng(37.785526, -122.401022),
    new google.maps.LatLng(37.785598, -122.401148),
    new google.maps.LatLng(37.785631, -122.401202),
    new google.maps.LatLng(37.785660, -122.401267),
    new google.maps.LatLng(37.803986, -122.426035),
    new google.maps.LatLng(37.804102, -122.425089),
    new google.maps.LatLng(37.804211, -122.424156),
    new google.maps.LatLng(37.803861, -122.423385),
    new google.maps.LatLng(37.803151, -122.423214),
    new google.maps.LatLng(37.802439, -122.423077),
    new google.maps.LatLng(37.801740, -122.422905),
    new google.maps.LatLng(37.801069, -122.422785),
    new google.maps.LatLng(37.800345, -122.422649),
    new google.maps.LatLng(37.799633, -122.422603),
    new google.maps.LatLng(37.799750, -122.421700),
    new google.maps.LatLng(37.799885, -122.420854),
    new google.maps.LatLng(37.799209, -122.420607),
    new google.maps.LatLng(37.795656, -122.400395),
    new google.maps.LatLng(37.795203, -122.400304),
    new google.maps.LatLng(37.778738, -122.415584),
    new google.maps.LatLng(37.778812, -122.415189),
    new google.maps.LatLng(37.778824, -122.415092),
    new google.maps.LatLng(37.778833, -122.414932),
    new google.maps.LatLng(37.778834, -122.414898),
    new google.maps.LatLng(37.778740, -122.414757),
    new google.maps.LatLng(37.778501, -122.414433),
    new google.maps.LatLng(37.778182, -122.414026),
    new google.maps.LatLng(37.777851, -122.413623),
    new google.maps.LatLng(37.777486, -122.413166),
    new google.maps.LatLng(37.777109, -122.412674),
    new google.maps.LatLng(37.776743, -122.412186),
    new google.maps.LatLng(37.776440, -122.411800),
    new google.maps.LatLng(37.776295, -122.411614),
    new google.maps.LatLng(37.776158, -122.411440),
    new google.maps.LatLng(37.775806, -122.410997),
    new google.maps.LatLng(37.775422, -122.410484),
    new google.maps.LatLng(37.775126, -122.410087),
    new google.maps.LatLng(37.775012, -122.409854),
    new google.maps.LatLng(37.775164, -122.409573),
    new google.maps.LatLng(37.775498, -122.409180),
    new google.maps.LatLng(37.775868, -122.408730),
    new google.maps.LatLng(37.776256, -122.408240),
    new google.maps.LatLng(37.776519, -122.407928),
    new google.maps.LatLng(37.776539, -122.407904),
    new google.maps.LatLng(37.776595, -122.407854),
    new google.maps.LatLng(37.776853, -122.407547),
    new google.maps.LatLng(37.777234, -122.407087),
    new google.maps.LatLng(37.777644, -122.406558),
    new google.maps.LatLng(37.778066, -122.406017),
    new google.maps.LatLng(37.778468, -122.405499),
    new google.maps.LatLng(37.778866, -122.404995),
    new google.maps.LatLng(37.779295, -122.404455),
    new google.maps.LatLng(37.779695, -122.403950),
    new google.maps.LatLng(37.779982, -122.403584),
    new google.maps.LatLng(37.780295, -122.403223),
    new google.maps.LatLng(37.780664, -122.402766),
    new google.maps.LatLng(37.781043, -122.402288),
    new google.maps.LatLng(37.781399, -122.401823),
    new google.maps.LatLng(37.781727, -122.401407),
    new google.maps.LatLng(37.781853, -122.401247),
    new google.maps.LatLng(37.781894, -122.401195),
    new google.maps.LatLng(37.782076, -122.400977),
    new google.maps.LatLng(37.782338, -122.400603),
    new google.maps.LatLng(37.782666, -122.400133),
    new google.maps.LatLng(37.783048, -122.399634),
    new google.maps.LatLng(37.783450, -122.399198),
    new google.maps.LatLng(37.783791, -122.398998),
    new google.maps.LatLng(37.784177, -122.398959),
    new google.maps.LatLng(37.784388, -122.398971),
    new google.maps.LatLng(37.784404, -122.399128),
    new google.maps.LatLng(37.784586, -122.399524),
    new google.maps.LatLng(37.784835, -122.399927),
    new google.maps.LatLng(37.785116, -122.400307),
    new google.maps.LatLng(37.785282, -122.400539),
    new google.maps.LatLng(37.785346, -122.400692),
    new google.maps.LatLng(37.765769, -122.407201),
    new google.maps.LatLng(37.765790, -122.407414),
    new google.maps.LatLng(37.765802, -122.407755),
    new google.maps.LatLng(37.765791, -122.408219),
    new google.maps.LatLng(37.765763, -122.408759),
    new google.maps.LatLng(37.765726, -122.409348),
    new google.maps.LatLng(37.765716, -122.409882),
    new google.maps.LatLng(37.765708, -122.410202),
    new google.maps.LatLng(37.765705, -122.410253),
    new google.maps.LatLng(37.765707, -122.410369),
    new google.maps.LatLng(37.765692, -122.410720),
    new google.maps.LatLng(37.765699, -122.411215),
    new google.maps.LatLng(37.765687, -122.411789),
    new google.maps.LatLng(37.765666, -122.412373),
    new google.maps.LatLng(37.765598, -122.412883),
    new google.maps.LatLng(37.765543, -122.413039),
    new google.maps.LatLng(37.765532, -122.413125),
    new google.maps.LatLng(37.765500, -122.413553),
    new google.maps.LatLng(37.765448, -122.414053),
    new google.maps.LatLng(37.765388, -122.414645),
    new google.maps.LatLng(37.765323, -122.415250),
    new google.maps.LatLng(37.765303, -122.415847),
    new google.maps.LatLng(37.765251, -122.416439),
    new google.maps.LatLng(37.765204, -122.417020),
    new google.maps.LatLng(37.765172, -122.417556),
    new google.maps.LatLng(37.765164, -122.418075),
    new google.maps.LatLng(37.765153, -122.418618),
    new google.maps.LatLng(37.765136, -122.419112),
    new google.maps.LatLng(37.765129, -122.419378),
    new google.maps.LatLng(37.765119, -122.419481),
    new google.maps.LatLng(37.765100, -122.419852),
    new google.maps.LatLng(37.765083, -122.420349),
    new google.maps.LatLng(37.765045, -122.420930),
    new google.maps.LatLng(37.764992, -122.421481),
    new google.maps.LatLng(37.764980, -122.421695),
    new google.maps.LatLng(37.764993, -122.421843),
    new google.maps.LatLng(37.764986, -122.422255),
    new google.maps.LatLng(37.764975, -122.422823),
    new google.maps.LatLng(37.764939, -122.423411),
    new google.maps.LatLng(37.764902, -122.424014),
    new google.maps.LatLng(37.764853, -122.424576),
    new google.maps.LatLng(37.764826, -122.424922),
    new google.maps.LatLng(37.764796, -122.425375),
    new google.maps.LatLng(37.764782, -122.425869),
    new google.maps.LatLng(37.764768, -122.426089),
    new google.maps.LatLng(37.764766, -122.426117),
    new google.maps.LatLng(37.764723, -122.426276),
    new google.maps.LatLng(37.764681, -122.426649),
    new google.maps.LatLng(37.782012, -122.404200),
    new google.maps.LatLng(37.781574, -122.404911),
    new google.maps.LatLng(37.781055, -122.405597),
    new google.maps.LatLng(37.780479, -122.406341),
    new google.maps.LatLng(37.779996, -122.406939),
    new google.maps.LatLng(37.779459, -122.407613),
    new google.maps.LatLng(37.778953, -122.408228),
    new google.maps.LatLng(37.778409, -122.408839),
    new google.maps.LatLng(37.777842, -122.409501),
    new google.maps.LatLng(37.777334, -122.410181),
    new google.maps.LatLng(37.776809, -122.410836),
    new google.maps.LatLng(37.776240, -122.411514),
    new google.maps.LatLng(37.775725, -122.412145),
    new google.maps.LatLng(37.775190, -122.412805),
    new google.maps.LatLng(37.774672, -122.413464),
    new google.maps.LatLng(37.774084, -122.414186),
    new google.maps.LatLng(37.773533, -122.413636),
    new google.maps.LatLng(37.773021, -122.413009),
    new google.maps.LatLng(37.772501, -122.412371),
    new google.maps.LatLng(37.771964, -122.411681),
    new google.maps.LatLng(37.771479, -122.411078),
    new google.maps.LatLng(37.770992, -122.410477),
    new google.maps.LatLng(37.770467, -122.409801),
    new google.maps.LatLng(37.770090, -122.408904),
    new google.maps.LatLng(37.769657, -122.408103),
    new google.maps.LatLng(37.769132, -122.407276),
    new google.maps.LatLng(37.768564, -122.406469),
    new google.maps.LatLng(37.767980, -122.405745),
    new google.maps.LatLng(37.767380, -122.405299),
    new google.maps.LatLng(37.766604, -122.405297),
    new google.maps.LatLng(37.765838, -122.405200),
    new google.maps.LatLng(37.765139, -122.405139),
    new google.maps.LatLng(37.764457, -122.405094),
    new google.maps.LatLng(37.763716, -122.405142),
    new google.maps.LatLng(37.762932, -122.405398),
    new google.maps.LatLng(37.762126, -122.405813),
    new google.maps.LatLng(37.761344, -122.406215),
    new google.maps.LatLng(37.760556, -122.406495),
    new google.maps.LatLng(37.759732, -122.406484),
    new google.maps.LatLng(37.758910, -122.406228),
    new google.maps.LatLng(37.758182, -122.405695),
    new google.maps.LatLng(37.757676, -122.405118),
    new google.maps.LatLng(37.757039, -122.404346),
    new google.maps.LatLng(37.756335, -122.403719),
    new google.maps.LatLng(37.755503, -122.403406),
    new google.maps.LatLng(37.754665, -122.403242),
    new google.maps.LatLng(37.753837, -122.403172),
    new google.maps.LatLng(37.752986, -122.403112),
    new google.maps.LatLng(37.751266, -122.403355)
  ];
}
<div id="floating-panel">
  <button onclick="toggleHeatmap()">Toggle Heatmap</button>
  <button onclick="changeGradient()">Change gradient</button>
  <button onclick="changeRadius()">Change radius</button>
  <button onclick="changeOpacity()">Change opacity</button>
</div>
<div id="map"></div>
/* Always set the map height explicitly to define the size of the div
 * element that contains the map. */
#map {
  height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}
#floating-panel {
  background-color: #fff;
  border: 1px solid #999;
  left: 25%;
  padding: 5px;
  position: absolute;
  top: 10px;
  z-index: 5;
}
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer
        src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&libraries=visualization&callback=initMap">
    </script>

実際に試す

コードブロックの右上にカーソルを合わせて、コードをコピーするか、コードを JSFiddl で開きます。

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Heatmaps</title>
    <style>
      /* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
      #map {
        height: 100%;
      }
      /* Optional: Makes the sample page fill the window. */
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #floating-panel {
        position: absolute;
        top: 10px;
        left: 25%;
        z-index: 5;
        background-color: #fff;
        padding: 5px;
        border: 1px solid #999;
        text-align: center;
        font-family: 'Roboto','sans-serif';
        line-height: 30px;
        padding-left: 10px;
      }
      #floating-panel {
        background-color: #fff;
        border: 1px solid #999;
        left: 25%;
        padding: 5px;
        position: absolute;
        top: 10px;
        z-index: 5;
      }
    </style>
  </head>

  <body>
    <div id="floating-panel">
      <button onclick="toggleHeatmap()">Toggle Heatmap</button>
      <button onclick="changeGradient()">Change gradient</button>
      <button onclick="changeRadius()">Change radius</button>
      <button onclick="changeOpacity()">Change opacity</button>
    </div>
    <div id="map"></div>
    <script>

      // This example requires the Visualization library. Include the libraries=visualization
      // parameter when you first load the API. For example:
      // <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=visualization">

      var map, heatmap;

      function initMap() {
        map = new google.maps.Map(document.getElementById('map'), {
          zoom: 13,
          center: {lat: 37.775, lng: -122.434},
          mapTypeId: 'satellite'
        });

        heatmap = new google.maps.visualization.HeatmapLayer({
          data: getPoints(),
          map: map
        });
      }

      function toggleHeatmap() {
        heatmap.setMap(heatmap.getMap() ? null : map);
      }

      function changeGradient() {
        var gradient = [
          'rgba(0, 255, 255, 0)',
          'rgba(0, 255, 255, 1)',
          'rgba(0, 191, 255, 1)',
          'rgba(0, 127, 255, 1)',
          'rgba(0, 63, 255, 1)',
          'rgba(0, 0, 255, 1)',
          'rgba(0, 0, 223, 1)',
          'rgba(0, 0, 191, 1)',
          'rgba(0, 0, 159, 1)',
          'rgba(0, 0, 127, 1)',
          'rgba(63, 0, 91, 1)',
          'rgba(127, 0, 63, 1)',
          'rgba(191, 0, 31, 1)',
          'rgba(255, 0, 0, 1)'
        ]
        heatmap.set('gradient', heatmap.get('gradient') ? null : gradient);
      }

      function changeRadius() {
        heatmap.set('radius', heatmap.get('radius') ? null : 20);
      }

      function changeOpacity() {
        heatmap.set('opacity', heatmap.get('opacity') ? null : 0.2);
      }

      // Heatmap data: 500 Points
      function getPoints() {
        return [
          new google.maps.LatLng(37.782551, -122.445368),
          new google.maps.LatLng(37.782745, -122.444586),
          new google.maps.LatLng(37.782842, -122.443688),
          new google.maps.LatLng(37.782919, -122.442815),
          new google.maps.LatLng(37.782992, -122.442112),
          new google.maps.LatLng(37.783100, -122.441461),
          new google.maps.LatLng(37.783206, -122.440829),
          new google.maps.LatLng(37.783273, -122.440324),
          new google.maps.LatLng(37.783316, -122.440023),
          new google.maps.LatLng(37.783357, -122.439794),
          new google.maps.LatLng(37.783371, -122.439687),
          new google.maps.LatLng(37.783368, -122.439666),
          new google.maps.LatLng(37.783383, -122.439594),
          new google.maps.LatLng(37.783508, -122.439525),
          new google.maps.LatLng(37.783842, -122.439591),
          new google.maps.LatLng(37.784147, -122.439668),
          new google.maps.LatLng(37.784206, -122.439686),
          new google.maps.LatLng(37.784386, -122.439790),
          new google.maps.LatLng(37.784701, -122.439902),
          new google.maps.LatLng(37.784965, -122.439938),
          new google.maps.LatLng(37.785010, -122.439947),
          new google.maps.LatLng(37.785360, -122.439952),
          new google.maps.LatLng(37.785715, -122.440030),
          new google.maps.LatLng(37.786117, -122.440119),
          new google.maps.LatLng(37.786564, -122.440209),
          new google.maps.LatLng(37.786905, -122.440270),
          new google.maps.LatLng(37.786956, -122.440279),
          new google.maps.LatLng(37.800224, -122.433520),
          new google.maps.LatLng(37.800155, -122.434101),
          new google.maps.LatLng(37.800160, -122.434430),
          new google.maps.LatLng(37.800378, -122.434527),
          new google.maps.LatLng(37.800738, -122.434598),
          new google.maps.LatLng(37.800938, -122.434650),
          new google.maps.LatLng(37.801024, -122.434889),
          new google.maps.LatLng(37.800955, -122.435392),
          new google.maps.LatLng(37.800886, -122.435959),
          new google.maps.LatLng(37.800811, -122.436275),
          new google.maps.LatLng(37.800788, -122.436299),
          new google.maps.LatLng(37.800719, -122.436302),
          new google.maps.LatLng(37.800702, -122.436298),
          new google.maps.LatLng(37.800661, -122.436273),
          new google.maps.LatLng(37.800395, -122.436172),
          new google.maps.LatLng(37.800228, -122.436116),
          new google.maps.LatLng(37.800169, -122.436130),
          new google.maps.LatLng(37.800066, -122.436167),
          new google.maps.LatLng(37.784345, -122.422922),
          new google.maps.LatLng(37.784389, -122.422926),
          new google.maps.LatLng(37.784437, -122.422924),
          new google.maps.LatLng(37.784746, -122.422818),
          new google.maps.LatLng(37.785436, -122.422959),
          new google.maps.LatLng(37.786120, -122.423112),
          new google.maps.LatLng(37.786433, -122.423029),
          new google.maps.LatLng(37.786631, -122.421213),
          new google.maps.LatLng(37.786660, -122.421033),
          new google.maps.LatLng(37.786801, -122.420141),
          new google.maps.LatLng(37.786823, -122.420034),
          new google.maps.LatLng(37.786831, -122.419916),
          new google.maps.LatLng(37.787034, -122.418208),
          new google.maps.LatLng(37.787056, -122.418034),
          new google.maps.LatLng(37.787169, -122.417145),
          new google.maps.LatLng(37.787217, -122.416715),
          new google.maps.LatLng(37.786144, -122.416403),
          new google.maps.LatLng(37.785292, -122.416257),
          new google.maps.LatLng(37.780666, -122.390374),
          new google.maps.LatLng(37.780501, -122.391281),
          new google.maps.LatLng(37.780148, -122.392052),
          new google.maps.LatLng(37.780173, -122.391148),
          new google.maps.LatLng(37.780693, -122.390592),
          new google.maps.LatLng(37.781261, -122.391142),
          new google.maps.LatLng(37.781808, -122.391730),
          new google.maps.LatLng(37.782340, -122.392341),
          new google.maps.LatLng(37.782812, -122.393022),
          new google.maps.LatLng(37.783300, -122.393672),
          new google.maps.LatLng(37.783809, -122.394275),
          new google.maps.LatLng(37.784246, -122.394979),
          new google.maps.LatLng(37.784791, -122.395958),
          new google.maps.LatLng(37.785675, -122.396746),
          new google.maps.LatLng(37.786262, -122.395780),
          new google.maps.LatLng(37.786776, -122.395093),
          new google.maps.LatLng(37.787282, -122.394426),
          new google.maps.LatLng(37.787783, -122.393767),
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    <script async defer
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  </body>
</html>

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Google Maps JavaScript API
Google Maps JavaScript API
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