Google地图空间参考系统 [英] Google maps spatial reference system

问题描述

我发现提示它可能是WGS84，但是，当您输入lat时，Google地图的空间参考系是什么意思？转换到该坐标系后，当我将坐标粘贴到Google地图搜索框时，什么都没有显示。

我正在从GDA MGA 56转换。

样本：

• 输入MGA56坐标：336301,6253363
  
• 预计WGS86的坐标：-33.8473340793201,151.230631835944
  
• 我得到：16834916.928327594 -4008321.1020318186
  

空间坐标系统：

• EPSG：28356 for MGA56


• EPSG：900913 for WGS86 ）

我使用geotools进行转换：

  CoordinateReferenceSystem crsMga56 = CRS.parseWKT（mga56）; 
 CoordinateReferenceSystem crsGmaps = CRS.parseWKT（gmaps）; 
 
坐标坐标=新坐标（336301,6253363）; 
 Point point = new GeometryFactory（）。createPoint（coordinate）; 
 
 MathTransform transform = CRS.findMathTransform（crsMga56，crsGmaps）; 
几何几何= JTS.transform（point，transform）; 
  

我知道转换是不正确的，因为当我使用在线工具时，它给了我正确的坐标。 http：// www.environment.gov.au/cgi-bin/transform/mga2geo_gda.pl?east=336301&north=6253363&zone=56

解决方案

Google使用基于WGS84的球形墨卡托投影。在OpenLayers网站上有写作。

What is Google map's spatial reference system using when you enter a lat, long into the maps search bar?

I've found hints that it might be WGS84 but after converting to that coordinate system, nothing shows up when i paste the coordinates into the google maps search box.

I am converting from GDA MGA 56.

Sample:

• Input MGA56 coords: 336301, 6253363
• Expected WGS86 coords: -33.8473340793201, 151.230631835944
• I get: 16834916.928327594 -4008321.1020318186

Spatial coord systems:

• EPSG:28356 for MGA56
• EPSG:900913 for WGS86 (google maps)

I am using geotools to do the transform:

    CoordinateReferenceSystem crsMga56 = CRS.parseWKT(mga56);
    CoordinateReferenceSystem crsGmaps = CRS.parseWKT(gmaps);

    Coordinate coordinate = new Coordinate(336301, 6253363);
    Point point = new GeometryFactory().createPoint(coordinate);

    MathTransform transform = CRS.findMathTransform(crsMga56, crsGmaps);
    Geometry geometry = JTS.transform(point, transform);

I know the transform is not correct, as when i use an online tool it gives me the correct coords. http://www.environment.gov.au/cgi-bin/transform/mga2geo_gda.pl?east=336301&north=6253363&zone=56

解决方案

Google uses a spherical mercator projection based on WGS84. There's a writeup on the OpenLayers website.

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