REST区域关系分析方法

最新推荐文章于 2021-11-12 16:25:14 发布

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#rest #null #object #exception #pair

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这篇博客介绍了如何利用REST服务进行地理空间分析，包括图元求交、图形简化和关系判断。通过ArcGIS的GeometryService，实现了图层间的Intersect和Relation操作，以确定点在多边形内的关系，并更新图形属性来展示这些关系。

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注意，所有层都需要坐标polyline2.SpatialReference = new SpatialReference(102113);

对两个图元求交：

（1） private void insertGeometryService()

{

MyMap.MinimumResolution = double.Epsilon;

geometryService = new GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");

//geometryService.SimplifyCompleted += new EventHandler<GraphicsEventArgs>(geometryService_SimplifyCompleted);

geometryService.Failed += new EventHandler<TaskFailedEventArgs>(geometryService_Failed);

query.IntersectLayer("18");//取得截取的面区域，用来做截取

}

（2)

public void drawInnerYLX()

{

try

{

if ((query.IntersectGraphicsLayer != null) && (graphicList != null))//graphicList 是很的的线，比如等值线

{//query.IntersectGraphicsLayer即刚取到的截取的面区域

query.IntersectGraphicsLayer.Geometry.SpatialReference = new SpatialReference(102113);

geometryService.IntersectCompleted += new EventHandler<GraphicsEventArgs>(geometryService_IntersectCompleted);

geometryService.IntersectAsync(graphicList, query.IntersectGraphicsLayer.Geometry);

}

catch (Exception ex) { MessageBox.Show(ex.ToString()); }

}

(3) void geometryService_IntersectCompleted(object sender, GraphicsEventArgs e)

{

GraphicsLayer intersectGraphicsLayer = MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer;

intersectGraphicsLayer.ClearGraphics();

foreach (Graphic g in e.Results)

{

g.Symbol = LayoutRoot.Resources["DefaultLineSymbol"] as Symbol;

intersectGraphicsLayer.Graphics.Add(g);

}

求关系类型：

（1）添加需要加入分析的图层。。。

geometryService =
    new GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");
            geometryService.RelationCompleted += new EventHandler<RelationEventArgs>(geometryService_RelationCompleted);
            geometryService.SimplifyCompleted += new EventHandler<GraphicsEventArgs>(geometryService_SimplifyCompleted);
            geometryService.Failed += new EventHandler<TaskFailedEventArgs>(geometryService_Failed);
            GraphicsLayer graphicsLayer = MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer;            geometryService.SimplifyAsync(graphicsLayer.graphics);

(2)增加二级图层：

    void geometryService_SimplifyCompleted(object sender, GraphicsEventArgs e)
        {
            GraphicsLayer pointLayer = MyMap.Layers["MyGraphicsLayer2"] as GraphicsLayer;
            geometryService.RelationAsync(
            pointLayer.Graphics,
            e.Results,
            GeometryRelation.esriGeometryRelationWithin, null);//这里还有个参数是关于图层关系的，这里是求包括在范围内

}

（3）求得关系：

        void geometryService_RelationCompleted(object sender, RelationEventArgs e)
        {
            List<GeometryRelationPair> results = e.Results;
            GraphicsLayer pointLayer = MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer;
            foreach (GeometryRelationPair pair in results)
            {
                if (pointLayer.Graphics[pair.Graphic1Index].Attributes["Relation"] == null)
                {
                    pointLayer.Graphics[pair.Graphic1Index].Attributes["Relation"] =
                    string.Format("Within Polygon {0}", pair.Graphic2Index);
                }
                else
                {
                    pointLayer.Graphics[pair.Graphic1Index].Attributes["Relation"] +=
                    "," + pair.Graphic2Index.ToString();
                }

                //if (polygonLayer.Graphics[pair.Graphic2Index].Attributes["Relation"] == null)
                //{
                //    polygonLayer.Graphics[pair.Graphic2Index].Attributes["Relation"] =
                //    string.Format("Contains Point {0}", pair.Graphic1Index);
                //}
                //else
                //{
                //    polygonLayer.Graphics[pair.Graphic2Index].Attributes["Relation"] +=
                //    "," + pair.Graphic1Index.ToString();
                //}
            }

}