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如何利用Skyline的TerraExplorer Pro 6.5提供的API接口实现矢量图层数据的动态投影

2013-11-12 11:29 579 查看

Skyline 支持国内常见的地图投影坐标系，包括WGS84、Beijing54、西安80、2000坐标系等，也可以自定义坐标系，比如一些做过参数变换加密的坐标系等。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript">
function Test() {
try {
var sg = CreateSGObj();
//alert(sg.CoordServices.SourceCoordinateSystem.WellKnownText);
ConvertPos(-635585.73259, 4582417.28002);
}
catch (e) {
alert(e);
}
}

function ConvertPos(x,y) {
try {
var sg = CreateSGObj();
var fCoord = CreateCoord1();
//alert(fCoord.WellKnownText);
var tCoord = CreateCoord2();
//alert(tCoord.WellKnownText);
var Coord2D = sg.CoordServices.Reproject(fCoord, tCoord, x, y);
alert(Coord2D);
sg.Navigate.FlyTo(Coord2D);
}
catch (e) {
alert(e);
}
}

function CreateCoord1() {
var sg = CreateSGObj();
return sg.CoordServices.CreateCoordinateSystem("PROJCS[\"Xian 1980 \/ 3-degree Gauss-Kruger CM 132E\",GEOGCS[\"Xian 1980\",DATUM[\"Xian_1980\",SPHEROID[\"IAG 1975\",6378140,298.257,AUTHORITY[\"EPSG\",\"7049\"]],AUTHORITY[\"EPSG\",\"6610\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],AUTHORITY[\"EPSG\",\"4610\"]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"latitude_of_origin\",0],PARAMETER[\"central_meridian\",132],PARAMETER[\"scale_factor\",1],PARAMETER[\"false_easting\",500000],PARAMETER[\"false_northing\",0],UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],AXIS[\"X\",NORTH],AXIS[\"Y\",EAST],AUTHORITY[\"EPSG\",\"2389\"]]");
}

function CreateCoord2() {
var sg = CreateSGObj();
//return sg.CoordServices.CreateCoordinateSystem("GEOGCS['WGS84 Coordinate System',DATUM['WGS 1984',SPHEROID['WGS1984',6378137,298.257223563],TOWGS84[0,0,0,0,0,0,0],AUTHORITY['EPSG','6326']],PRIMEM['Greenwich',0],UNIT['degree',0.0174532925199433],AUTHORITY['EPSG','4326'],AUTHORITY['SBMG','LAT-LONG,LAT-LONG,WGS84,METERS']]");
return sg.CoordServices.SourceCoordinateSystem;
}

//------------------------------------------------------------
// 创建sgworld对象  赵贺 2011.04.07.
//------------------------------------------------------------
function CreateSGObj() {
var obj = $("sgworld");
if (obj == null) {
obj = document.createElement('object');
document.body.appendChild(obj);
obj.name = "sgworld";
obj.id = "sgworld";
obj.classid = "clsid:3a4f9197-65a8-11d5-85c1-0001023952c1";
}
return obj;
}
function $(id) {
return window.document.getElementById(id);
}
</script>
</head>
<body >
<input id="Button1" type="button" value="button" onclick="Test()" />
<OBJECT ID="TerraExplorer3DWindow" CLASSID="CLSID:3a4f9192-65a8-11d5-85c1-0001023952c1" width="600px" height="400px" ></OBJECT>
<OBJECT ID="TerraExplorerInformationWindow" CLASSID="CLSID:3a4f9193-65a8-11d5-85c1-0001023952c1" width="300px" height="400px" ></OBJECT>
</body>
</html>

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