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终于把自定义瓦片无偏差的叠加到高德地图上了

2014-05-18 22:50:45| 分类：一道鸡丝 | 标签： |举报 |字号大中小订阅

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终于把高德变形后的数据，自己切图，最后无偏差的定位到高德地图上去了。接下来的事就将一马平川了。这里的高德地图是AMAP。

最后的结果其实很简单：

<% 
	String sx = request.getParameter("x");
	String sy = request.getParameter("y");
	String sz = request.getParameter("z");
	
	long	x = Long.parseLong(sx);
	long	y = Long.parseLong(sy);
	long	z = Long.parseLong(sz);

	y = (long)Math.pow(2,z)-y-1;
    long 	shift = z / 2;
    long 	half = 2 << shift;
    int digits = 1;
    if (half > 10) 
    {
        digits = (int) (Math.log10(half)) + 1;
    }
    
        long halfx = x / half;
        long halfy = y / half;
        
       String	template = String.format("http://localhost:8080/gwcimgroot/test_BJ5W/EPSG_900913_%%02d/%%0%dd_%%0%dd/%%0%dd_%%0%dd.%%s", digits,digits,2*digits,2*digits); 

    String url = String.format(template, z, halfx, halfy, x, y, "png");	    
    response.sendRedirect(url);
%>

但是中间却有血的教训。一个最为关键的地方是：AMAP的地图是EPSG:900913；而不是EPSG:4326。EPSG:900913也就是所谓的Web 墨卡托投影。

最开始犯的错误是切图以EPSG:4326进行，然后以切图后的缓存瓦片目录规则与AMAP自定义图层规则进行映射。结果中间总结的结果总不能完美的使用；而且还带来的一个非常严重的错误的观点：以为高德的地图层级与GeoWebCache的不一致。

中间系统的了解了下所有的投影概念，研究了OpenLayer的例子，看了各类地图的瓦片概念，最后做了个AMAP自定义图层的瓦片定位索引才搞明白。

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