What software is linux proj

In Linux, proj is a general coordinate conversion software, a longitude and latitude coordinate to plane projection coordinate conversion library, which can convert geospatial coordinates from one coordinate reference system to another. PROJ supports over a hundred different map projections and can transform coordinates between datums using all but the most obscure geodetic techniques.

The operating environment of this tutorial: CentOS7.6 system, Proj 7.1.0, Dell G3 computer.

What software is proj

PROJ is a general coordinate conversion software, a longitude and latitude coordinate to plane projection coordinate conversion library, which can convert geographic Spatial coordinates are converted from one coordinate reference system (CRS) to another coordinate reference system (CRS). This includes cartographic projections and geodetic transformations.

When developing GIS applications, you may need to calculate the distance between two points using GPS coordinates and measure the azimuth angle of the line connecting the two points. You can use this open source GIS conversion library for conversion.

PROJ includes a command line application for easily converting coordinates from text files or directly from user input. In addition to command line utilities, PROJ also exposes an application programming interface, or API. The API allows developers to use PROJ functionality in their own software without having to implement similar functionality themselves.

PROJ began as a cartography application that allowed users to convert geodetic coordinates to projected coordinates using many different cartographic projections. Over the years, support for benchmark conversion slowly made its way into PROJ as the need became apparent. Today, PROJ supports over a hundred different map projections and can convert coordinates between datums using all but the most obscure geodetic techniques.

Compilation and installation of Proj

Version information

Proj needs to install sqlite3, libtiff, libcurl-devel, etc.

安装 sqlite3 >= 3.11
➜  yum install -y libtiff libtiff-devel.x86_64
➜  yum install -y libcurl-devel.x86_64

Proj official website: https://proj.org /

# 下载源码
➜  wget https://download.osgeo.org/proj/proj-7.1.0.tar.gz

Installation instructions View the INSTALL file in the source code home directory

# 使用最简单的安装方式
# 解压
➜  tar zxf proj-7.1.0.tar.gz
➜  cd proj-7.1.0

# 编译 && 安装
➜  ./configure && make && make install

1. sqlite3 is not installed

➜  ./configure
checking for SQLITE3... configure: error: Package requirements (sqlite3 >= 3.11) were not met:

No package 'sqlite3' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables SQLITE3_CFLAGS
and SQLITE3_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

Error resolution

➜  wget https://www.sqlite.org/2020/sqlite-autoconf-3330000.tar.gz
➜  tar -zxf sqlite-autoconf-3330000.tar.gz

# sqlite3 就使用最简单的编译三部曲安装。
➜  cd sqlite-autoconf-3330000
➜  ./configure && make && make install

# 环境变量
➜  find / -name "pkgconfig" -print
/usr/lib64/pkgconfig
/usr/share/pkgconfig
/usr/local/lib/pkgconfig
/usr/local/lib64/pkgconfig

# 可以设置PKG_CONFIG_PATH
# 或者设置 SQLITE3_CFLAGS SQLITE3_LIBS
➜  export PKG_CONFIG_PATH=/usr/lib64/pkgconfig:/usr/share/pkgconfig:/usr/local/lib/pkgconfig:/usr/local/lib64/pkgconfig:$PKG_CONFIG_PATH

2. libtiff-4 is not installed

➜  ./configure
checking for TIFF... configure: error: Package requirements (libtiff-4) were not met:

No package 'libtiff-4' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables TIFF_CFLAGS
and TIFF_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

Error resolution

➜  yum install -y libtiff libtiff-devel.x86_64

3. curl-config is not installed

checking for curl-config... not-found
configure: error: curl not found. If wanting to do a build without curl support (and thus without built-in networking capability), explictly disable it with --without-curl

Error resolution

➜  yum install -y libcurl-devel.x86_64

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