arcgis JS 空间查询

最新推荐文章于 2024-01-15 15:08:14 发布

马野a

最新推荐文章于 2024-01-15 15:08:14 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/litai0141/article/details/80507314

本文详细介绍了如何使用ArcGIS JavaScript API进行空间查询，涵盖了基础的几何操作、图层查询、缓冲区分析等内容，助你实现地图上的精准数据筛选与分析。

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//空间查询
          var tb = new Draw(map);
          tb.on("draw-end", doQuery);
          registry.forEach(function (d) {
              if (d.declaredClass === "dijit.form.Button") {
                 d.on("click", activateTool);
              }
          });
          var kongjian = document.getElementById("kongjianBTN");
          // 实例化查询任务类
          xiaobanTask = new esri.tasks.QueryTask(URL + "/4");
          linbanTask = new esri.tasks.QueryTask(URL + "/3");
          // 实例化查询参数类
          query = new esri.tasks.Query();
          query.returnGeometry = true;
          // 实例化信息模板类
          xiaobanInfoTemplate = new esri.InfoTemplate("${林场名}", "林班号： ${林班号}<br/> <br />面积：${面积}<br/> <br />小班号： ${小班号} <br/> <br />公顷蓄积： ${公顷蓄积}m³<br/> <br />年龄： ${年龄}年<br/><br/>平均高： ${平均高}m <br/><br/>平均径： ${平均径}cm<br/><br/>优势树种 :${优势树种}：");
         linbanInfoTemplate = new esri.InfoTemplate( "林班号： ${林班号} ");
          // 实例化符号类
          var redColor = new Color([255, 0, 0]);
          var halfFillYellow = new Color([255, 255, 0, 0.5]);
          pointSym = new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_DIAMOND, 10,
                      new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, redColor, 1),
                      halfFillYellow);
          lineSym = new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASHDOT, redColor, 2);
          polygonSym = new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID,
                      new SimpleLineSymbol(SimpleLineSymbol.STYLE_SOLID, redColor, 2),
                      halfFillYellow);

          function activateTool() {
              var tool = null;
              if (this.label == "取消查询") {
                  tb.deactivate();
              } else {
                  switch (this.label) {
                      case "空间查询":
                          tool = "POLYGON";        
                          break;
                  }
                  tb.activate(Draw[tool]);
                  map.hideZoomSlider();
              }
          }
          function doQuery(evt) {
              query.geometry = evt.geometry;
              var taskName = document.getElementById("task").value;
              var queryTask;
              if (taskName === "xiaobanTask") {
                  queryTask = xiaobanTask;
                  query.outFields = ["林场名", "林班号", "小班号", "面积", "公顷蓄积", "年龄", "平均高", "郁闭度", "平均径", "优势树种"];
              }
              else if (taskName === "linbanTask") {
                  queryTask = linbanTask;
                  query.outFields = ["林班号"];
              }
              queryTask.execute(query, showResults);
          }
          function showResults(featureSet) {
              // 清除上一次的高亮显示
              map.graphics.clear();
              var symbol, infoTemplate;
              var taskName = document.getElementById("task").value;
              switch (taskName) {
                  case "linbanTask":
                      symbol = polygonSym;
                      infoTemplate = linbanInfoTemplate;
                      break;
                  case "xiaobanTask":
                      symbol = polygonSym;
                      infoTemplate = xiaobanInfoTemplate;
                      break;
              }
              var resultFeatures = featureSet.features;
              for (var i = 0, il = resultFeatures.length; i < il; i++) {
                  // 从featureSet中得到当前地理特征
                  // 地理特征就是一图形对象
                  var graphic = resultFeatures[i];
                  graphic.setSymbol(symbol);
                  // 设置信息模板
                  graphic.setInfoTemplate(infoTemplate);
                  // 在地图的图形图层中增加图形
                  map.graphics.add(graphic);
              }
          }