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cesium_example_auth


			
				
					
						
						
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    <meta name="author" content="火星科技 http://mars3d.cn " />
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    <!-- 标题及搜索关键字 -->
    <meta name="keywords" content="火星科技,cesium,3D,GIS,marsgis,三维,地球,地图,开发,框架,系统,示例,资料,模型,离线,外包,合肥,安徽,中国" />
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      content="火星科技 合肥火星 合肥火星科技 合肥火星科技有限公司 leaflet leaflet框架 leaflet开发 cesium cesium开发 cesium框架 三维 地球 模型  gis marsgis 地图离线 地图开发 地图框架 地图外包 框架 开发 外包  地图离线 二维地图 三维地图 全景漫游 地理信息系统 云GIS 三维GIS GIS平台 WebGIS"
    />

    <link rel="shortcut icon" type="image/x-icon" href="" />
    <title>卫星成像过程 </title>

    <!--第三方lib-->
    <script
      type="text/javascript"
      src="../lib/include-lib.js"
      libpath="../lib/"
      include="jquery,font-awesome,bootstrap,layer,haoutil,turf,mars3d"
    ></script>

    <link href="css/style.css" rel="stylesheet" />
  </head>

  <body class="dark">
    <!--加载前进行操作提示，优化用户体验-->
    <div id="mask" class="signmask" onclick="removeMask()"></div>

    <div id="mars3dContainer" class="mars3d-container"></div>

    <script src="./js/common.js"></script>
    <script type="text/javascript">
      "use script"; //开发环境建议开启严格模式

      var map;
      var graphicLayer;

      function initMap(options) {
        //合并属性参数，可覆盖config.json中的对应配置
        var mapOptions = mars3d.Util.merge(options, {
          scene: {
            //此处参数会覆盖config.json中的对应配置
            center: { lat: 40, lng: 111.833884, alt: 20000000, heading: 0, pitch: -90 },
            cameraController: {
              zoomFactor: 3.0,
              minimumZoomDistance: 1,
              maximumZoomDistance: 300000000,
              constrainedAxis: false, //解除在南北极区域鼠标操作限制
            },
          },
        });

        //创建三维地球场景
        map = new mars3d.Map("mars3dContainer", mapOptions);

        //创建矢量数据图层
        graphicLayer = new mars3d.layer.GraphicLayer();
        map.addLayer(graphicLayer);

        haoutil.loading.show();

        var czml = Cesium.CzmlDataSource.load("//data.mars3d.cn/file/czml/satellite-one.czml");
        czml
          .then(function (dataSource) {
            haoutil.loading.close();

            map.dataSources.add(dataSource);

            let satelliteEntity = dataSource.entities.values[0];

            var swathWidth = swathWidthDict[satelliteEntity.id];
            satelliteFoot.start(satelliteEntity, swathWidth);
          })
          .otherwise(function (error) {
            haoutil.alert(error, "加载数据出错");
          });
      }

      //多个卫星时可以可配置【卫星地面投射圆半径，足迹宽度】
      var swathWidthDict = {
        "Satellite/CBERS 4": 650000.0,
      };

      // 地球观测的轨道预测,包含绘制卫星到地球的足迹功能。
      var satelliteFoot = {
        start: function (entity, instrumentFOV) {
          if (!instrumentFOV) {
            //默认值；
            instrumentFOV = 2000 * 1000;
          }

          var secondMultiplier = instrumentFOV / 250000.0; // 每间隔多少公里进行显示一次足迹。
          var intervalBetweenFootPrints = 40 * secondMultiplier; //setInterval间隔脚印的时长
          var numberOfFootPrintsAtAtime = parseInt(90 / Math.ceil(secondMultiplier)) * 5; //保持足迹的数量个数

          var point = mars3d.LatLngPoint.fromCartesian(entity.position, map.clock.currentTime);
          this.drawOneFoot(point, instrumentFOV);

          var timeLast = map.clock.currentTime.secondsOfDay + intervalBetweenFootPrints;

          map.on(mars3d.EventType.clockTick, (event) => {
            var sxTimes = Math.abs(map.clock.currentTime.secondsOfDay - timeLast); //剩下时长

            if (sxTimes < 1 || sxTimes > intervalBetweenFootPrints) {
              console.log(sxTimes);

              timeLast = map.clock.currentTime.secondsOfDay + intervalBetweenFootPrints;

              if (graphicLayer.length >= numberOfFootPrintsAtAtime) {
                graphicLayer.clear();
              }

              var point = mars3d.LatLngPoint.fromCartesian(entity.position, map.clock.currentTime);
              this.drawOneFoot(point, instrumentFOV);
            }
          });
        },

        //绘制一个足迹
        drawOneFoot: function (point, instrumentFOV) {
          //卫星到地面的垂直线
          this._drawLineGroundToSatellite(point);

          //投射圆锥体
          this._drawInstrumentFootPrintSwathWidth(instrumentFOV, point);

          // 在地球表面上绘制可见足迹椭圆
          this._drawVisibleFootPrint(point);
        },

        //卫星到地面的垂直线,point: 卫星在天空中的位置
        _drawLineGroundToSatellite: function (point) {
          var groundPoint = Cesium.Cartesian3.fromDegrees(point.lng, point.lat, 0.0);

          var point1 = new mars3d.graphic.PointPrimitive({
            position: point,
            style: {
              pixelSize: 2,
              color: Cesium.Color.RED,
            },
          });
          graphicLayer.addGraphic(point1);

          var point2 = new mars3d.graphic.PointPrimitive({
            position: groundPoint,
            style: {
              pixelSize: 2,
              color: Cesium.Color.RED,
            },
          });
          graphicLayer.addGraphic(point2);

          var primitiveLine = new mars3d.graphic.PolylinePrimitive({
            positions: [point, groundPoint],
            style: {
              width: 1,
              color: Cesium.Color.YELLOW,
            },
          });
          graphicLayer.addGraphic(primitiveLine);
        },
        //投射圆锥体
        _drawInstrumentFootPrintSwathWidth: function (instrumentFOV, point) {
          var primitive = new mars3d.graphic.CylinderPrimitive({
            name: "视锥体",
            position: Cesium.Cartesian3.fromDegrees(point.lng, point.lat, point.alt / 2),
            style: {
              length: point.alt,
              topRadius: 0.0,
              bottomRadius: instrumentFOV,
              color: Cesium.Color.GREEN.withAlpha(0.3),
              outline: true,
              outlineColor: Cesium.Color.RED.withAlpha(0.5),
            },
          });
          graphicLayer.addGraphic(primitive);
        },
        // 在地球表面上绘制可见足迹椭圆（红色外圈线）
        _drawVisibleFootPrint: function (point) {
          var groundPoint = Cesium.Cartesian3.fromDegrees(point.lng, point.lat, 0.0);

          var radiusOfEarth = Cesium.Cartesian3.distance(new Cesium.Cartesian3(0, 0, 0), groundPoint);
          var satToOrignEarth = radiusOfEarth + point.alt; // point to origin of earth
          var groundPointToSatPointToTangentAngle = Cesium.Math.toDegrees(Math.asin(radiusOfEarth / satToOrignEarth));
          var groundPointToOriginToTangentAngle = 90.0 - groundPointToSatPointToTangentAngle;
          var distanceAlongGround = Cesium.Math.TWO_PI * radiusOfEarth * (groundPointToOriginToTangentAngle / 360.0);

          var primitive = new mars3d.graphic.CirclePrimitive({
            name: "可视卫星范围（45度）",
            position: groundPoint,
            style: {
              radius: distanceAlongGround,
              color: "#ff0000",
              opacity: 0.1,
              outline: true,
              outlineColor: "#ff0000",
            },
          });
          graphicLayer.addGraphic(primitive);
        },
      };
    </script>
  </body>
</html>