多元数据可视化

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          visualVariables: [
            {
              type: "size",
              valueExpression: "$feature.HEAT_INDEX - $feature.TEMP",
              valueExpressionTitle: "感知温度和实际空气温度的差距",
              minDataValue: 0,
              maxDataValue: 30,
              minSize: 4,
              maxSize: 24
            }, {
              type: "color",
              field: "R_HUMIDITY",
              stops: [
                { value: 20, color: "#ffefdc" },
                { value: 35, color: "#edac90" },
                { value: 50, color: "#da6843" },
                { value: 65, color: "#a03523" },
                { value: 80, color: "#660202" }
              ]
            }
          ]

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          visualVariables: [
            {
              type: "size",
              field: "WIND_SPEED",
              minDataValue: 5,
              maxDataValue: 60,
              minSize: 4,
              maxSize: 24
            }, {
              type: "rotation",
              field: "WIND_DIRECT",
              rotationType: "geographic"
            }
          ]

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          visualVariables: [
            {
              type: "rotation",
              field: "WIND_DIRECT",
              rotationType: "geographic"
            },
            {
              type: "size",
              field: "WIND_SPEED",
              minDataValue: 5,
              maxDataValue: 60,
              minSize: {
                type: "size",
                valueExpression: "$view.scale",
                // adjust the min size by scale
                stops: [
                  { value: referenceScale, size: 8 },
                  { value: referenceScale*2, size: 6 },
                  { value: referenceScale*4, size: 4 },
                  { value: referenceScale*8, size: 2 }
                ]
              },
              maxSize: {
                type: "size",
                valueExpression: "$view.scale",
                // adjust the max size by scale
                stops: [
                  { value: referenceScale, size: 40 },
                  { value: referenceScale*2, size: 30 },
                  { value: referenceScale*4, size: 20 },
                  { value: referenceScale*8, size: 10 }
                ]
              }
            },
            {
              type: "color",
              field: "TEMP",
              stops: [
                { value: 20, color: "#2b83ba" },
                { value: 35, color: "#abdda4" },
                { value: 50, color: "#ffffbf" },
                { value: 65, color: "#fdae61" },
                { value: 80, color: "#d7191c" }
              ]
            }
          ]