Question

我正在尝试将地理坐标系转换为Esri Webmercator，但是当我进行转换时，结果x和y的值为0000003232112222 ...和00000012665321 .... 这是非常奇怪的，因为坐标不存在。

var positions = [];
positions.push(x, y);

var g = new esri.geometry.Point(positions);
g = esri.geometry.geographicToWebMercator(g);
x = g.x;
y = g.y;

Answer 1

您实际上不必转换latitide /经度来将点添加到webmercator中的底图。

您可以使用纬度/经度直接创建Point（并且API将在内部以几种不同的方式进行从地理位置到webmercator的转换）。这是从版本3。3（2013年1月）开始提供的。

var point = new Point(-98, 38); // note that longitude(x) comes before the latitude(y).

// or as an array
var point = new Point([-98, 38]);

// or as an object
var point = new Point({latitude: 38, longitude: -98});

https://developers.arcgis.com/javascript/3/jsapi/point-amd.html#point4

Answer 2

您应该在geographicToWebMercator模块中尝试esri/geometry/webMercatorUtils方法。请详细查看documentation。

        //a point in GCS_WGS_1984(wkid is 4326)
        var point = new Point(-118.15, 33.80, new SpatialReference({
            wkid: 4326
        }));

        var pointWebMercator = webMercatorUtils.geographicToWebMercator(point);

        alert("the point in 102100 is ( " + pointWebMercator.x + "," + pointWebMercator.y + " )");

现场演示：

＆＃13;

<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no" />
    <title>Converting geographic WGS 84 to Web Mercator 102100</title>
    <link rel="stylesheet" href="https://js.arcgis.com/3.20/esri/css/esri.css">
    <style>
        html,
        body,
        #map {
            height: 100%;
            margin: 0;
            padding: 0;
        }
    </style>
    <script src="https://js.arcgis.com/3.20/"></script>
    <script>
        var map;

        require(["esri/map", "esri/geometry/Point", "esri/SpatialReference", "esri/geometry/webMercatorUtils", "dojo/domReady!"], function (Map, Point, SpatialReference, webMercatorUtils) {
            map = new Map("map", {
                basemap: "topo", //For full list of pre-defined basemaps, navigate to http://arcg.is/1JVo6Wd
                center: [-122.45, 37.75], // longitude, latitude
                zoom: 13
            });

            //a point in GCS_WGS_1984(wkid is 4326)
            var point = new Point(-118.15, 33.80, new SpatialReference({
                wkid: 4326
            }));

            var pointWebMercator = webMercatorUtils.geographicToWebMercator(point);

            alert("the point in 102100 is ( " + pointWebMercator.x + "," + pointWebMercator.y + " )");
        });
    </script>
</head>

<body>
    <div id="map"></div>
</body>

</html>

＆＃13;

希望它可以帮助你。

将地理WGS 84转换为Web Mercator 102100

2 个答案: