Question

我有一个使用openlayers V5.3.0的节点映射应用程序。当我尝试将EPSG：4326的几何形状转换为使用proj4.defs定义的投影时，出现以下错误消息： TypeError：无法读取null的属性“ getCode”

如果我将openLayers更改为4.6.4版，则转换几何的代码将起作用。

还有其他人遇到过这个问题吗？

以下HTML演示了该问题。

<html>
<head>
    <meta http-equiv="Cache-Control" content="no-cache">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" >
    <title>Projection Test</title>

    <script
            src="https://code.jquery.com/jquery-2.2.4.min.js"
            integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44="
            crossorigin="anonymous"></script>

   <!-- <script src="https://cdnjs.cloudflare.com/ajax/libs/openlayers/4.6.4/ol-debug.js"></script> -->

    <script src="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.3.0/build/ol.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.5.0/proj4.js"></script>


    <script>proj4.defs("EPSG:28355","+proj=utm +zone=55 +south +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs");</script>

     <script>

         $(document).ready(function() {
             let gJSONOpts = {
                 dataProjection: "EPSG:3857",
                 featureProjection: "EPSG:28355"
             };

             let jsonPt = {
                 "type": "Feature",
                 "id": "GEO_BRM_STOPS.fid--79f50be5_16adc4d0ce7_6a6b",
                 "geometry": {
                     "type": "Point",
                     "coordinates": [16154413.50099648, -4988654.4460995]
                 },
                 "geometry_name": "OBJ"
             };

             let feature = new ol.format.GeoJSON().readFeature(jsonPt.geometry, gJSONOpts);
             let tg = feature.getGeometry().transform('EPSG:28355', "EPSG:4326");
             let out = 'Projected Coordinates: ' + tg.getCoordinates()[0] + ', ' +tg.getCoordinates()[1];

             $("#mapvwr").html(out);

         });
     </script>
</head>
<body>
    <div id="mapvwr">

    </div>
</body>
</html>

将以上内容粘贴到html文件中，然后在浏览器中显示。

取消注释此行：

 <!-- <script src="https://cdnjs.cloudflare.com/ajax/libs/openlayers/4.6.4/ol-debug.js"></script> -->

并注释掉以下行：

<script src="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.3.0/build/ol.js"></script>

要查看正确的结果：

Projected Coordinates: 145.11756553931886, -40.83921285742692

Answer 1

我发现了问题。定义投影后，需要将此添加为脚本ol.proj.proj4.register(proj4);。

我无法将几何图形转换为openlayers 5.3的proj4.defs中定义的投影

1 个答案: