Question

我尝试使用以下代码添加geojson GeometryCollection（两个多边形在一个功能中）：

var featurecollection = {"type":"Feature", "properties":{"WKR_NR":{"value":"66", "displayName":"WKR_NR"}, "WKR_NAME":{"value":"Altmark", "displayName":"WKR_NAME"}, "LAND_NR":{"value":"15", "displayName":"LAND_NR"}, "LAND_NAME":{"value":"Sachsen-Anhalt", "displayName":"LAND_NAME"}}, "geometry":{"type":"GeometryCollection", "geometries":[{"type":"Polygon", "coordinates":[[[11.82209622587612, 52.34301860166207], [11.817774093487138, 52.334218350541896], [11.807618922039657, 52.334988060217924], [11.790223804374884, 52.3372550858293], [11.78804671117088, 52.35066482829717], [11.80055500070333, 52.35470147787753], [11.819318685600722, 52.34773879534134], [11.82209622587612, 52.34301860166207]]]}, {"type":"Polygon", "coordinates":[[[11.625490226126516, 53.014155173198034], [11.643792593971638, 53.005353749176265], [11.678605317048948, 53.007500272184636], [11.691508960695465, 52.97890177931147], [11.744900087714374, 52.98836377813224], [11.785485168911753, 52.96123819494062], [11.843231838584519, 52.953331343009545], [11.846841832814349, 52.940137809430865], [11.823030489231808, 52.92303250071203], [11.83682008625954, 52.90938467138226], [11.981941169062262, 52.87607203121912], [12.020385227153387, 52.88841247097549], [12.080988158376819, 52.88220894061335], [12.127289816840882, 52.88981664655036], [12.119895693664516, 52.87543803746719], [12.13248219200621, 52.8558211228031], [12.199403343824061, 52.8714428383796], [12.232750317016908, 52.86024742307424], [12.251497497148451, 52.809510687301696], [12.247443721853234, 52.791959611234866], [12.22364885088984, 52.785328135584855], [12.21227265368092, 52.77301936690752], [12.197091298456408, 52.7188147816694], [12.238613424621569, 52.665409856765734], [12.230258850787465, 52.62968330608261], [12.190385960758247, 52.6201934757329], [12.17515906502223, 52.60457261828375], [12.174433832794424, 52.58003052479018], [12.143361062323343, 52.53573113037129], [12.171210063866818, 52.5062636155928], [12.162640316645106, 52.500835395082156], [12.108195830773255, 52.50822883163489], [12.103168497725802, 52.52477556943423], [12.076814313382958, 52.54004044347858], [12.050694924487075, 52.525045881355894], [11.990420550370642, 52.52007883088814], [11.997901831632793, 52.571024464450616], [11.988240632385583, 52.57527707609638], [11.980151608981359, 52.53823974699831], [11.95970542521976, 52.51858066040097], [12.002753238668047, 52.460333327925404], [11.992708877983876, 52.43103249736487], [11.962270843821118, 52.400999345836794], [11.929241869486036, 52.39181373779316], [11.900270801301792, 52.35418951773055], [11.851935108210942, 52.33139272188436], [11.817433924211613, 52.372403339618714], [11.834328379190685, 52.38188020438711], [11.840446842567902, 52.40164092728919], [11.824000038133862, 52.421633313829446], [11.79788329849156, 52.4048537794548], [11.748126546321151, 52.403015286614185], [11.719844059178572, 52.409742937959756], [11.699715351222565, 52.459041056498315], [11.642991884388962, 52.47027254032829], [11.58745520968375, 52.458591499535565], [11.562455406690738, 52.41074571800978], [11.445607147252204, 52.386918975933064], [11.451253714966386, 52.40716604689364], [11.382327026093915, 52.43044308452597], [11.33303944763232, 52.42398398569652], [11.243861916949461, 52.43771185485013], [11.147647875850998, 52.43388371635617], [11.089960257644199, 52.455533659368896], [11.05650628403439, 52.5062061560478], [11.00865540209794, 52.49743833029479], [10.959367089863635, 52.534880501626205], [10.937115198576306, 52.56809668379479], [10.940699738434244, 52.58980058724528], [10.972900452451096, 52.60390715247509], [10.976957812353136, 52.624198440535906], [10.945210633577373, 52.62031889495053], [10.926765054712599, 52.60921629226031], [10.908807605370766, 52.62675394652262], [10.902900060583416, 52.63288635850292], [10.838250804892366, 52.69536905177916], [10.79667724408703, 52.71431343626516], [10.755698500874928, 52.78463211599313], [10.759750766469935, 52.79609356944849], [10.765414355239177, 52.8414963636739], [10.841955892273544, 52.85196752350796], [10.93957634429748, 52.85277462442411], [10.986189746274858, 52.88272387705999], [11.001678908430973, 52.91108170517689], [11.069342325527263, 52.909623974478905], [11.110626400886918, 52.89555950095206], [11.156283854647228, 52.90608086656519], [11.21878208126892, 52.89799790911749], [11.239884606905864, 52.879517541557206], [11.29579804373252, 52.875170703477764], [11.406571977621434, 52.904075444754625], [11.470842953571694, 52.938951093845404], [11.504592143927084, 52.941128094313925], [11.492348754753628, 52.95953308861247], [11.512383406030214, 53.00726268548251], [11.555636882784334, 52.998602963293635], [11.59617386672076, 53.0362803481102], [11.623050800347798, 53.041932006345355], [11.641148205721082, 53.0377603493648], [11.625490226126516, 53.014155173198034]]]}]}, "crs":{"type":"name", "properties":{"name":"urn:ogc:def:crs:OGC:1.3:CRS84"}}};

       var geojson_format = new OpenLayers.Format.GeoJSON({
                'internalProjection': new OpenLayers.Projection("EPSG:900913"),
                'externalProjection': new OpenLayers.Projection("EPSG:4326")
            });
       vectors.addFeatures(geojson_format.read(featurecollection));

多边形显示得非常好，您可以在此处看到：

http://217.16.163.138/flaechen.php

单击多边形后，将触发“serialize”函数，并将geojson代码写入输出框：

        var type = "geojson";
        var pretty = false;
        var str = formats['out'][type].write(feature, pretty);
        str = str.replace(/,/g, ', ');
        document.getElementById('output_featureonly').value = str;

问题在于多边形的投影正在变成一种奇怪的东西。

该代码仅适用于一个要素中的一个多边形。您可以在这里自己尝试：

http://217.16.163.138/flaechen.php

提前致谢弗洛里安

Answer 1

看起来OpenLayers不支持这种类型，或者至少不以这种方式呈现：

http://dev.openlayers.org/docs/files/OpenLayers/Format/GeoJSON-js.html#OpenLayers.Format.GeoJSON.read

对于多个多边形，类型应为'MultiPolygon'：

http://www.geojson.org/geojson-spec.html#multipolygon

尝试将输入减少到最小测试用例，它应该更容易调试。

openlayers geojson GeometryCollection序列化

1 个答案: