Geocode

A library of utility functions related to geo-coordinates used across a few different projects.

Provides functions for performing common activities such as:

Calculate distance between two coordinates using Vincenty's formula.
Check if a point falls within a bounding polygon.
Look up the street address for a specified geo-coordinate using positionstack.
Look up the geo-coordinate for a specified street address using positionstack.
Compute the centroid of a set of geo-coordinates.
Cluster a set of coordinates using k-means algorithm.
Convert coordinates into Open Location Code.

A simple shell application (geocodesh) is also available for quickly invoking some of the interfaces provided by the library. Please note that operations involving use of the positionstack API needs an environment variable POSITION_STACK_KEY to be set with the API key.

Examples

Examples of the library and CLI utility.

CLI

Library

#include <geocode/geocode.hpp> int main() { const auto key = std::getenv( "POSITION_STACK_KEY" ); const auto address = spt::geocode::address( 41.9215927, -87.6953278, key ); const auto point = spt::geocode::fromAddress( "565 5 Ave, Manhattan, New York, NY, USA", key ); const auto points = std::array{ spt::geocode::Point{ .latitude = 63.8066559, .longitude = -83.6791916 }, spt::geocode::Point{ .latitude = 60.244442, .longitude = -149.6915436 }, }; const auto centroid = spt::geocode::centroid( std::span<const spt::geocode::Point>{ points } ); const auto points = std::vector<spt::geocode::Point>{ {63.8066559, -83.6791916}, {41.9461021, -87.6977005}, {41.9215927, -87.6953278}, {41.9121971, -87.6807251}, {60.244442, -149.6915436}, {41.8827209, -87.6352386}, {41.8839951, -87.6347198}, {41.8830872, -87.6359787}, {41.883255, -87.6354523}, {41.8830147, -87.6354752}, {41.881218, -87.6351395}, {41.8841934, -87.6364594}, {41.8837547, -87.6352844}, {41.8826141, -87.6353912}, {41.8827934, -87.6357727}, {41.8830872, -87.6352005}, {41.8839989, -87.632843}, {41.8855286, -87.6347198}, {41.8848267, -87.6368179}, {41.943203, -87.7009201} }; const auto clustered = spt::geocode::cluster( points, 32, 3 ); const auto p1 = spt::geocode::Point{ .latitude = 51.752021, .longitude = -1.257726 }; const auto p2 = spt::geocode::Point{ .latitude = 51.507351, .longitude = -0.127758 }; const auto [d, a] = spt::geocode::distance( p1, p2 ); const auto point = spt::geocode::Point{ .latitude = 63.8066559, .longitude = -83.6791916 }; const auto str = spt::geocode::toLocationCode( point ); const auto p = spt::geocode::fromLocationCode( str ); }

Build

Build the library using cmake:

git clone https://github.com/sptrakesh/geocode.git cd geocode cmake -DCMAKE_PREFIX_PATH="/usr/local/boost;/usr/local/cpr" \ -DCMAKE_BUILD_TYPE=Release \ -DCMAKE_INSTALL_PREFIX=/usr/local/spt \ -DOPENSSL_ROOT_DIR=/opt/homebrew/opt/openssl \ -S . -B build cmake --build build -j12 sudo cmake --install build

Last modified: 21 January 2025