PROJ.4库和OSGB36 [英] PROJ.4 library and OSGB36

问题描述

希望你很好

我正在尝试使用proj.4库将经纬度坐标转换为OSGB36 x和y.

I am trying to convert lat/long coordinates to OSGB36 x and y using the proj.4 library.

还有其他人成功做到了吗?我需要填写srcPrj4String和destPrj4String变量，例如

Has anyone else successfully done this? I need to fill the srcPrj4String and destPrj4String variables, e.g.

string srcPrj4String ="+ proj = longlat + ellps = WGS84 + datum = WGS84 + no_defs";
string destPrj4String ="+ proj = utm + zone = 11 + ellps = GRS80 + datum = NAD83 + units = m";

string srcPrj4String = "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs";
string destPrj4String = "+proj=utm +zone=11 +ellps=GRS80 +datum=NAD83 +units=m";

但是我不知道OSGB36应该是destPrj4String是什么-我知道基准应该是+ datum = OSGB36，但是我尝试的所有方法都不起作用

but I can't figure out the what the destPrj4String should be with OSGB36 - i know the datum should be +datum=OSGB36, but everything I try, doesn't work

有什么想法吗?

非常感谢

leddy

推荐答案

获取它:

string srcPrj4String = "+proj=longlat +ellps=WGS84 +towgs84=0,0,0 +no_defs";
string destPrj4String = "+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +towgs84=446.448,-125.157,542.060,0.1502,0.2470,0.8421,-20.4894 +units=m +no_defs";

欢呼！

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