分析---影像分析

1.效果图

2.发布服务

在Arccatalog中共享为影像服务
发布成功之后查看
说明发布成功

3.引入模块

查询影像数据esri/tasks/ImageServiceIdentifyTask

参数：esri/tasks/ImageServiceIdentifyParameters esri/tasks/ImageServiceIdentifyResult
esri/tasks/ImageServiceIdentifyResult接收返回的参数

影像测量esri/tasks/ImageServiceMeasureTask

参数：esri/tasks/ImageServiceMeasureParameters

4.步骤

加载图层（不使用动态，使用影像服务）
创建影像分析和分析方法的参数对象
绑定事件，获取高程值并弹出

其中的掩模规则等可以封装为接口，方便以后使用

5.代码

影像分析

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<link rel="stylesheet" href="https://js.arcgis.com/3.28/esri/css/esri.css" />
<script src="https://js.arcgis.com/3.28/"></script>
<script  src="https://code.jquery.com/jquery-1.12.4.js"></script>
<style>
    .MapClass{
        width:100%;
        height:700px;
        border:1px solid #000;
    }
</style>
<script>
    require(["esri/map","esri/layers/ArcGISImageServiceLayer","dojo/on",
    "dojo/dom","esri/toolbars/draw",
    "esri/tasks/ImageServiceIdentifyTask","esri/tasks/ImageServiceIdentifyParameters",
    "esri/symbols/SimpleLineSymbol","esri/graphic","esri/symbols/SimpleMarkerSymbol", "esri/symbols/SimpleFillSymbol",
    "esri/layers/MosaicRule",
    "dojo/domReady!"],function(Map,ArcGISImageServiceLayer,on,dom,Draw,ImageServiceIdentifyTask,
    ImageServiceIdentifyParameters,SimpleLineSymbol,
    Graphic,SimpleMarkerSymbol,SimpleFillSymbol,MosaicRule){
        var map=new Map("mapDiv")

        //注意这里是影像服务
        var layer=new ArcGISImageServiceLayer("http://localhost:6080/arcgis/rest/services/demo/ImageService_qingdao/ImageServer")
        map.addLayer(layer);
        //用于绘制点
        var toolbar =new Draw(map);

        //创建影像分析对象
        var task=new ImageServiceIdentifyTask("http://localhost:6080/arcgis/rest/services/demo/ImageService_qingdao/ImageServer");
        //创建影像分析参数对象
        var params=new ImageServiceIdentifyParameters();
        var lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASH, new dojo.Color([255, 0, 0]), 3);
        var marker= new SimpleMarkerSymbol(SimpleMarkerSymbol.STYLE_CIRCLE,10, lineSymbol, new dojo.Color([255, 0, 0]));
        var fill= new SimpleFillSymbol(SimpleFillSymbol.STYLE_SOLID, lineSymbol,  new dojo.Color([255, 0, 0]));
        //给绘制折线按钮绑定事件
        on(dom.byId("drawp"),"click",function(){
            toolbar.activate(Draw.POINT, {
                    showTooltips:true
            })
        })
        //给draw工具的绘制完成事件绑定函数
        on(toolbar,"draw-complete", function (result) {
            map.graphics.clear();
            var geometry=result.geometry;
            //给参数对象的几何属性赋值
            params.geometry =geometry;
            graphic= new Graphic(geometry, marker);
            map.graphics.add(graphic);
            toolbar.deactivate();

        })

        on(dom.byId("btn"),"click",function(){
            //设置掩膜规则
            var mosaicRule=new MosaicRule();
            mosaicRule.ascending=false;
            mosaicRule.method=MosaicRule.METHOD_CENTER
            params.mosaicRule=mosaicRule
            params.pixelSizeX=layer.pixelSizeX;
            params.pixelSizeY=layer.pixelSizeY;
            task.execute(params,function(result){
                //弹出改点的高程值
                alert(result.value)
            })
        })

    });
</script>