如何自定义czml数据源?

时间:2017-08-15 07:50:53

标签: datasource cesium czml

我有一个通过python提取的CZML数据。 我有建筑物,它们的几何形状,高度,建筑物ID和间隔。每个区间都有一个值。 在将czml数据加载到Cesium之后,我想访问属性,然后根据给定的值自定义建筑物的颜色。 以下是我的CZML示例:

  

[{       " id":"文件",       "版本":" 1.0"   },{       " id":32,       "可用性":" 2014-01-01T00:00:00Z / 2014-12-31T00:00:00Z",       " polygon":{           "职位":{               " cartographicDegrees&#34 ;: [54.7162360431897,24.4519912715277,0,54.716219612921,24.4519754832587,0,54.7162501395131,24.4519488635358,0,54.7162465684811,24.4519454316688,0,54.7162670831639,24.4519275432238,0,54.7162707308589,24.4519310439514,0,54.7163022563025,24.4519035537608, 0,54.7161962974502,24.4518018819532,0,54.7161647729823,24.4518293730395,0,54.7162035538​​772,24.4520196028966,0,54.7162360431897,24.4519912715277,0]           },           " someProperty":[{               " interval":" 2014-00-01T00:00:00Z / 2014-01-01T00:00:00Z",               " En_C_need":0.7           },{               " interval":" 2014-01-01T00:00:00Z / 2014-02-01T00:00:00Z",               " En_C_need":1.0           },{               " interval":" 2014-02-01T00:00:00Z / 2014-03-01T00:00:00Z",               " En_C_need":2.6           },{               " interval":" 2014-03-01T00:00:00Z / 2014-04-01T00:00:00Z",               " En_C_need":12.1           },{               " interval":" 2014-04-01T00:00:00Z / 2014-05-01T00:00:00Z",               " En_C_need":30.2           },{               " interval":" 2014-05-01T00:00:00Z / 2014-06-01T00:00:00Z",               " En_C_need":37.8           }],           " extrudedHeight":6.0       }   }]

我有自定义的其他GeoJSON数据,我尝试了相同的方法,但它没有工作。

以下是我尝试做的事情(这不起作用):

var test2 = Cesium.CzmlDataSource.load ('Data/czml/TESTING/example_8.czml');
test2.then(function (dataSource) {
    viewer.dataSources.add(test2);
    viewer.zoomTo (test2);
var entities = dataSource.entities.values; 

    var colorHash = {};
    var Energy = [];
    for (var i = 0; i < entities.length; i++) {
        var entity = entities[i];
        Energy = entity.someProperty.En_C_need;
        var color = colorHash [Energy];
        if(!color ) {
            if (Energy < 5 ) {
            color = Cesium.Color.DARKSALMON.withAlpha (0.95);
        } else if (Energy < 10) {
                color = Cesium.Color.BURLYWOOD.withAlpha (0.95);
        } else if (Energy < 20) {
                color = Cesium.Color.RED.withAlpha (0.95);
        } else {
                color = Cesium.Color.PINK.withAlpha (0.95); 
        };
        colorHash[Energy] = color;
        };
        entity.polygon.fill = true;
        entity.polygon.material = color;
        entity.polygon.outline = false;     
    };

});

1 个答案:

答案 0 :(得分:1)

从解决方案开始 - 这是工作的plnkr: https://plnkr.co/edit/P1Cg4DNJYtK9r9XrLzxK?p=preview

我已经更改了代码中的一些内容: 1)viewer.dataSources.add(test2);应该超出你的承诺(它并不重要,但它更清晰的代码 - 使用承诺中的承诺感觉很奇怪)。 2)根据CZML属性规范,您需要将属性放在CZML中的正确位置。它不应该在多边形内,而应在&#34; root&#34;:

var czml = [{"id": "document", "version": "1.0"},
{
    "id": 32, "availability": "2014-01-01T00:00:00Z/2014-12-31T00:00:00Z", "properties": {
    "someProperty": [
        {"interval": "2014-00-01T00:00:00Z/2014-01-01T00:00:00Z", "En_C_need": 0.7}, 
        {"interval": "2014-01-01T00:00:00Z/2014-02-01T00:00:00Z", "En_C_need": 1.0},
        {"interval": "2014-02-01T00:00:00Z/2014-03-01T00:00:00Z", "En_C_need": 2.6},
        {"interval": "2014-03-01T00:00:00Z/2014-04-01T00:00:00Z", "En_C_need": 12.1},
        {"interval": "2014-04-01T00:00:00Z/2014-05-01T00:00:00Z", "En_C_need": 30.2},
        {"interval": "2014-05-01T00:00:00Z/2014-06-01T00:00:00Z", "En_C_need": 37.8}
        ],
},
    "polygon": {
        "positions": {
            "cartographicDegrees":
                [54.7162360431897, 24.4519912715277, 0, 54.716219612921, 24.4519754832587, 0, 54.7162501395131, 24.4519488635358, 0, 54.7162465684811, 24.4519454316688, 0, 54.7162670831639, 24.4519275432238, 0, 54.7162707308589, 24.4519310439514, 0, 54.7163022563025, 24.4519035537608, 0, 54.7161962974502, 24.4518018819532, 0, 54.7161647729823, 24.4518293730395, 0, 54.7162035538772, 24.4520196028966, 0, 54.7162360431897, 24.4519912715277, 0]
        },
        "extrudedHeight": 6.0
    }
}];

然后你可以根据间隔(Energy = entity.properties.getValue(viewer.clock.currentTime).someProperty.En_C_need;)询问属性,并在观察者的当前时间获得能量。

评论聊天后更新: 您的代码无意动态更改。您需要按callbackProperty设置值,如下例所示:plnkr.co/edit/lm290uaQewEvfIOgXbDP?p=preview或使用timeIntervalCollection