Question

很多面对象union分析变成一个面，如何写循环实现

Answer 1

您好，您需要的是将多个面对象使用叠加求交的方式合并成一个面吗，

单纯的迭代循环就可以实现的。

希望可以帮助到您。

Comments

<script type="text/javascript">

    map = L.map('map', {
        crs: L.CRS.EPSG4326,
        center: [40, 117],
        maxZoom: 18,
        zoom: 8
    });

    var 空间分析url="http://localhost:8090/iserver/services/spatialAnalysis-ChengDuShengXian/restjsr/spatialanalyst"


    function UNION (s,o,url) {
        var GeometryOverlayAnalystParameters= new SuperMap.GeometryOverlayAnalystParameters({
            sourceGeometry: s,
            operateGeometry: o,
            operation: SuperMap.OverlayOperationType.UNION
        })
        L.supermap.spatialAnalystService(url).overlayAnalysis(GeometryOverlayAnalystParameters, function (serviceResult) {
                    base=serviceResult.result.resultGeometry

        })


    }


    var base = {
        "type": "Feature",
        "geometry": {
            "type": "Polygon",
            "coordinates": [[[116.25, 40.25],
                [116.25, 39.75],
                [117.25, 39.75],
                [117.25, 40.25],
                [116.25, 40.25]]]
        }
    };
    var l1 = {
        "type": "Feature",
        "geometry": {
            "type": "Polygon",
            "coordinates": [[[116.75, 40.25],
                [116.75, 39.75],
                [117.75, 39.75],
                [117.75, 40.25],
                [116.75, 40.25]]]
        }
    };
    var l2 = {
        "type": "Feature",
        "geometry": {
            "type": "Polygon",
            "coordinates": [[[116.75, 39.75],
                [117.25, 39.75],
                [117.25, 40.75],
                [116.75, 40.75],
                [116.75, 39.75]]]
        }
    };

    var l3 = {
        "type": "Feature",
        "geometry": {
            "type": "Polygon",
            "coordinates": [[[116.75, 40.25],
                [116.75, 39.25],
                [117.25, 39.25],
                [117.25, 40.25],
                [116.75, 40.25]]]
        }
    };



    UNION(base,l1,空间分析url)
    UNION(base,l2,空间分析url)
    UNION(base,l3,空间分析url)
    L.geoJSON(base).addTo(map);


    
    
</script>-->

这样迭代由于异步的原因不能成功，有没有解决方案

---

你如果是已知你面的数量，也就是需要迭代的次数，可以直接在一个里去写循环的。

或者可以参考这个demo：https://iclient.supermap.io/examples/leaflet/editor.html#04_geometryOverlayBatchAnalystService