GeographicLib安装

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本文介绍GeographicLib C++ API的安装步骤及如何利用该库实现从WGS84坐标系转换到UTM再到MGRS坐标系的操作。包括配置、编译、测试和安装等过程，并提供了具体的代码示例。

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GeographicLib C++ API 官方文档

安装

下载压缩包安装：

GeographicLib-1.51.tar.gz
Unpack the source, running one of
```
  tar xfpz GeographicLib-1.51.tar.gz
```
then enter the directory created with
```
  cd GeographicLib-1.51 
```
Create a separate build directory and enter it, for example,
```
  mkdir BUILD
  cd BUILD 
```
Run cmake, pointing it to the source directory (…). On Linux, Unix, and MacOSX systems, the command is
```
  cmake .. 
```

Build and install the software. In non-IDE environments, run

  make         # compile the library and utilities
  make test    # run some tests
  make install # as root, if CMAKE_INSTALL_PREFIX is a system directory

include in your CMakeLists.txt files

    find_package (GeographicLib REQUIRED)
    add_executable (program source1.cpp source2.cpp)
    target_link_libraries (program ${GeographicLib_LIBRARIES})

实例：WGS84转UTM再转MGRS（部分通用代码省略）

#include <GeographicLib/Geodesic.hpp>
#include <GeographicLib/UTMUPS.hpp>
#include <GeographicLib/MGRS.hpp>

double northing, easting; // UTM坐标

bool northp; // 北半球还是南半球
int izone; // UTM的zone

//WGS84->UTM
UTMUPS::Forward(newGps.lat, newGps.lon, izone, northp, easting, northing);
string zonestr = UTMUPS::EncodeZone(izone, northp);
cout << zonestr << " " << easting << " " << northing << "\n";

//UTM->MGRS
string mgrs;
// int prec=5, 意思是精确到m，如果prec=7，精确到cm，如此类推
MGRS::Forward(izone, northp, easting, northing, 7, mgrs);
// mgrs code转成MGRS坐标
cout << stod(mgrs.substr(5, 7).insert(5, ".")) << " " <<stod(mgrs.substr(12).insert(5, ".")) << "\n";