使用 GeometryService 计算 WMTS 图层地图范围答案

【问题标题】：Calculate WMTS layer map extent with GeometryService使用 GeometryService 计算 WMTS 图层地图范围
【发布时间】：2013-12-01 19:05:53
【问题描述】：

我有 WMTS 背景层、WMS 层和图形层中的点数组。这些点具有用于计算地图范围的 wgs84latlng 坐标。

不工作：

当使用 GeometryService 计算范围时，wms 图层很好地投影在其顶部，只是它的位置向上移动，并且与 GeometryService 计算的 GraphicsLayer 中点的位置不对应...

服务：

    <esri:GeometryService id="geometryService"
                          concurrency="last"
                          fault="geometryService_faultHandler(event)"
                          projectComplete="projectCompleteHandler(event)"
                          showBusyCursor="true"
                          url="http://sampleserver6.arcgisonline.com/arcgis/rest/services/Utilities/Geometry/GeometryServer"/>

    <esri:GeometryService id="geometryService2"
                          concurrency="last"
                          fault="geometryService_faultHandler(event)"
                          projectComplete="projectCompleteHandler2(event)"
                          showBusyCursor="true"
                          url="http://sampleserver6.arcgisonline.com/arcgis/rest/services/Utilities/Geometry/GeometryServer"/>

层：

    <esri:ArcGISTiledMapServiceLayer id="arcgisonlineLayer" load="{trace(arcgisonlineLayer.version)}" 
                                     url="http://services.arcgisonline.nl/arcgis/rest/services/Basiskaarten/PDOK_BRT/MapServer"/>   

    <esri:WMSLayer url="{wmsLayerUrl}">
        <esri:visibleLayers>
            <s:ArrayList>
                <fx:String>0</fx:String><!-- GTG vlakken -->
                <fx:String>1</fx:String><!-- GTG lijnen -->
                <!--<fx:String>2</fx:String>--><!-- Provinciale wegen-->
                <fx:String>3</fx:String><!-- GTG punten -->
                <fx:String>4</fx:String><!-- Kilometrering -->
                <fx:String>5</fx:String><!-- Kilometrering -->
                <fx:String>6</fx:String><!-- Kilometrering -->
                <fx:String>7</fx:String><!-- Kilometrering -->
                <fx:String>8</fx:String><!-- Beheergebied -->
                <!--<fx:String>9</fx:String>--><!-- Eigendomsgebied -->
                <!--<fx:String>10</fx:String>--><!-- Onderhoudsgebied -->
            </s:ArrayList>
        </esri:visibleLayers>
    </esri:WMSLayer>

    <esri:GraphicsLayer id="lichtpuntLayer"  />

计算范围：

public function set mapItemBounds(value:Object):void
        {
            _mapItemBounds = value as LatLngBounds;

            if(_mapItemBounds)
            {
                var wmExtent:WebMercatorExtent = new WebMercatorExtent(
                    _mapItemBounds.getSouthWest().lng(),
                    _mapItemBounds.getSouthWest().lat(),
                    _mapItemBounds.getNorthEast().lng(),
                    _mapItemBounds.getNorthEast().lat());
                var outSR:SpatialReference = new SpatialReference(28992);
                const projectParameters:ProjectParameters = new ProjectParameters;
                projectParameters.geometries = [ wmExtent];
                projectParameters.outSpatialReference = outSR;
                geometryService.project(projectParameters);

            }
        }

计算地图上的位置点

override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
        {
            super.updateDisplayList(unscaledWidth, unscaledHeight);

            if(mapItemsProject) { 
                mapItemsProject = false;
                var mapItemGeometryArr:Array = new Array();
                for each(var mapItem:IMapItem in mapItems) {
                    var latlng:LatLng = new LatLng(mapItem.wgs84Lat, mapItem.wgs84Lon);
                    mapItemGeometryArr.push(latlng.mapPoint())
                }

                var outSR:SpatialReference = new SpatialReference(28992);
                const projectParameters:ProjectParameters = new ProjectParameters;
                projectParameters.geometries =  mapItemGeometryArr;
                projectParameters.outSpatialReference = outSR;
                geometryService2.project(projectParameters);
            }

工作正常：

...在使用默认 arcgisonline.com worldSteetMap 时进行比较。

层：

<esri:ArcGISTiledMapServiceLayer id="serviceLayer"
        url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer" 
        visible="{viewModeButtonBar.selectedIndex == 0}"/>

    <esri:ArcGISTiledMapServiceLayer 
        url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer"
        visible="{viewModeButtonBar.selectedIndex == 1}"/>  

    <!--PDOK layer is incompatable with lichtpuntLayer and id="map". If lichtpuntLayer and another map in declarations it will show up-->
    <!--<esri:ArcGISTiledMapServiceLayer visible="true"
        url="http://services.arcgisonline.nl/arcgis/rest/services/Basiskaarten/PDOK_BRT/MapServer"/>-->


    <esri:WMSLayer url="{wmsLayerUrl}">
        <esri:visibleLayers>
            <s:ArrayList>
                <fx:String>0</fx:String><!-- GTG vlakken -->
                <fx:String>1</fx:String><!-- GTG lijnen -->
                <!--<fx:String>2</fx:String>--><!-- Provinciale wegen -->
                <fx:String>3</fx:String><!-- GTG punten -->
                <fx:String>4</fx:String><!-- Kilometrering -->
                <fx:String>5</fx:String><!-- Kilometrering -->
                <fx:String>6</fx:String><!-- Kilometrering -->
                <fx:String>7</fx:String><!-- Kilometrering -->
                <fx:String>8</fx:String><!-- Beheergebied -->
            </s:ArrayList>
        </esri:visibleLayers>
    </esri:WMSLayer>

    <esri:GraphicsLayer id="lichtpuntLayer"/>

计算范围：

        public function set mapItemBounds(value:Object):void
        {
            _mapItemBounds = value as LatLngBounds;

            if(_mapItemBounds)
            {
                map.extent = new WebMercatorExtent(
                    _mapItemBounds.getSouthWest().lng(),
                    _mapItemBounds.getSouthWest().lat(),
                    _mapItemBounds.getNorthEast().lng(),
                    _mapItemBounds.getNorthEast().lat());
            }
        }

有人知道为什么这不起作用吗？

【问题讨论】：

标签： apache-flex adobe arcgis esri wms

【解决方案1】：

因为这是一个具有 RD_New 结构的平铺地图，所以当您发送它们时，您还需要让 GeometryService 在纬度点上执行 DatumTransform；在我的情况下“Amersfoort_To_WGS_1984_2008_MB”。我还必须将 wkid 设置为 108457 并将 transformForward 设置为 false（默认）。

            var projectParameters:ProjectParameters = new ProjectParameters();
            var datumTransform: DatumTransform = new DatumTransform();
            datumTransform.wkid = 108457;
            datumTransform.wkt = "Amersfoort_To_WGS_1984_2008_MB";
            projectParameters.outSpatialReference = new SpatialReference(28992);
            projectParameters.datumTransform = datumTransform;
            projectParameters.transformForward = false;
            projectParameters.geometries = [ webMercatorExtent ];
            geometryService1.project(projectParameters)

【讨论】：