3
我试图创建类似的东西到这一点,但我有一些麻烦这个工作:Fusion Tables的热图层
https://google-developers.appspot.com/maps/documentation/javascript/examples/layer-heatmap
我必须存储在Fusion Tables的约35K记载,我想用来创建热图。数据集包含lat,long和counts。
我还想在热图上加上另一个图层,它将在地图上显示为标记(这个数据集也存储在Fusion Tables中,大约600行。我怎样才能用下列坐标替换taxiData ?我的融合表
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Google Maps JavaScript API v3 Example: Heatmap Layer</title>
<link href="/maps/documentation/javascript/examples/default.css" rel="stylesheet">
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false&libraries=visualization"></script>
<script>
// Adding 500 Data Points
var map, pointarray, heatmap;
var taxiData = [
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)
];
function initialize() {
var mapOptions = {
zoom: 13,
center: new google.maps.LatLng(37.774546, -122.433523),
mapTypeId: google.maps.MapTypeId.SATELLITE
};
map = new google.maps.Map(document.getElementById('map_canvas'),
mapOptions);
pointArray = new google.maps.MVCArray(taxiData);
heatmap = new google.maps.visualization.HeatmapLayer({
data: pointArray
});
heatmap.setMap(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.setOptions({
gradient: heatmap.get('gradient') ? null : gradient
});
}
function changeRadius() {
heatmap.setOptions({radius: heatmap.get('radius') ? null : 20});
}
function changeOpacity() {
heatmap.setOptions({opacity: heatmap.get('opacity') ? null : 0.2});
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="height: 600px; width: 800px;"></div>
<button onclick="toggleHeatmap()">Toggle Heatmap</button>
<button onclick="changeGradient()">Change gradient</button>
<button onclick="changeRadius()">Change radius</button>
<button onclick="changeOpacity()">Change opacity</button>
</body>
</html>
谢谢!有没有办法调整热图,使其在放大时不会降级/消失? – davids12 2013-02-14 15:56:38
@ user2072392:这不是真的有辱人格,它只是相应地分散权重。因为当你放大,物品“分散开来”并失去它们的体重集中时,它会产生有辱人格的幻觉。如果您想避免这种情况,您需要修改查询过滤器,以便仅从适合视图窗口的地理定位中提取数据 - 我认为这不受支持。 – PinnyM 2013-02-14 16:08:24
啊,我明白了。再次感谢您的帮助,我真的很感激! – davids12 2013-02-14 16:16:58