Geotools

Geotools is a PHP geo-related library.

Features

• Accept almost all kind of WGS84 geographic coordinates as coordinates. »
• Support 23 different ellipsoids and it's easy to provide a new one if needed. »
• Convert and format decimal degrees coordinates to decimal minutes or degrees minutes seconds coordinates. »
• Convert decimal degrees coordinates in the Universal Transverse Mercator (UTM) projection. »
• Compute the distance in meter (by default), km, mi or ft between two coordinates using flat, great circle, haversine or vincenty algorithms. »
• Compute the initial and final bearing from the origin coordinate to the destination coordinate in degrees. »
• Compute the initial and final cardinal point (direction) from the origin coordinate to the destination coordinate, read more in wikipedia. »
• Compute the half-way point (coordinate) between the origin and the destination coordinates. »
• Compute the destination point (coordinate) with given bearing in degrees and a distance in meters. »
• Encode a coordinate to a geo hash string and decode it to a coordinate, read more in wikipedia and on geohash.org. »
• Encode a coordinate via the 10:10 algorithm. »
• Polygon class provides methods to check either a poing (coordinate) is in, or on the polygon's boundaries. »
• ... more to come ...

Installation

Geotools can be found on Packagist. The recommended way to install Geotools is through composer.

Run the following on the command line:

php composer require laravie/geotools=~1.0

Usage & API

Coordinate & Ellipsoid

The default geodetic datum is WGS84 and coordinates are in decimal degrees.

Here are the available ellipsoids: AIRY, AUSTRALIAN_NATIONAL, BESSEL_1841, BESSEL_1841_NAMBIA, CLARKE_1866, CLARKE_1880, EVEREST, FISCHER_1960_MERCURY, FISCHER_1968, GRS_1967, GRS_1980, HELMERT_1906, HOUGH, INTERNATIONAL, KRASSOVSKY, MODIFIED_AIRY, MODIFIED_EVEREST, MODIFIED_FISCHER_1960, SOUTH_AMERICAN_1969, WGS60, WGS66, WGS72, and WGS84.

If you need to use an other ellipsoid, just create an array like this:

<?php

$myEllipsoid = \League\Geotools\Coordinate\Ellipsoid::createFromArray([
    'name' => 'My Ellipsoid', // The name of the Ellipsoid
    'a'    => 123.0, // The semi-major axis (equatorial radius) in meters
    'invF' => 456.0 // The inverse flattening
]);

Geotools is built to work with Geocoder. It means it's possible to use the \Geocoder\Model\Address directly but it's also possible to use a string or a simple array with its latitude and longitude.

It supports valid and acceptable geographic coordinates like:

• 40:26:46N,079:56:55W
• 40:26:46.302N 079:56:55.903W
• 40°26′47″N 079°58′36″W
• 40d 26′ 47″ N 079d 58′ 36″ W
• 40.446195N 79.948862W
• 40.446195, -79.948862
• 40° 26.7717, -79° 56.93172

Latitudes below -90.0 or above 90.0 degrees are capped through \League\Geotools\Coordinate\Coordinate::normalizeLatitude().
Longitudes below -180.0 or above 180.0 degrees are wrapped through \League\Geotools\Coordinate\Coordinate::normalizeLongitude().

<?php

use League\Geotools\Coordinate\Coordinate;
use League\Geotools\Coordinate\Ellipsoid;

// from an \Geocoder\Model\Address instance within Airy ellipsoid
$coordinate = new Coordinate($geocoderResult, Ellipsoid::createFromName(Ellipsoid::AIRY));
// or in an array of latitude/longitude coordinate within GRS 1980 ellipsoid
$coordinate = new Coordinate([48.8234055, 2.3072664], Ellipsoid::createFromName(Ellipsoid::GRS_1980));
// or in latitude/longitude coordinate within WGS84 ellipsoid
$coordinate = new Coordinate('48.8234055, 2.3072664');
// or in degrees minutes seconds coordinate within WGS84 ellipsoid
$coordinate = new Coordinate('48°49′24″N, 2°18′26″E');
// or in decimal minutes coordinate within WGS84 ellipsoid
$coordinate = new Coordinate('48 49.4N, 2 18.43333E');
// the result will be:
printf("Latitude: %F\n", $coordinate->getLatitude()); // 48.8234055
printf("Longitude: %F\n", $coordinate->getLongitude()); // 2.3072664
printf("Ellipsoid name: %s\n", $coordinate->getEllipsoid()->getName()); // WGS 84
printf("Equatorial radius: %F\n", $coordinate->getEllipsoid()->getA()); // 6378136.0
printf("Polar distance: %F\n", $coordinate->getEllipsoid()->getB()); // 6356751.317598
printf("Inverse flattening: %F\n", $coordinate->getEllipsoid()->getInvF()); // 298.257224
printf("Mean radius: %F\n", $coordinate->getEllipsoid()->getArithmeticMeanRadius()); // 6371007.772533
// it's also possible to modify the coordinate without creating an other coodinate
$coordinate->setFromString('40°26′47″N 079°58′36″W');
printf("Latitude: %F\n", $coordinate->getLatitude()); // 40.446388888889
printf("Longitude: %F\n", $coordinate->getLongitude()); // -79.976666666667

Convert

It provides methods (and aliases) to convert decimal degrees WGS84 coordinates to degrees minutes seconds or decimal minutes WGS84 coordinates. You can format the output string easily.

You can also convert them in the Universal Transverse Mercator (UTM) projection (Southwest coast of Norway and the region of Svalbard are covered).

<?php

$geotools   = new \League\Geotools\Geotools();
$coordinate = new \League\Geotools\Coordinate\Coordinate('40.446195, -79.948862');
$converted  = $geotools->convert($coordinate);
// convert to decimal degrees without and with format string
printf("%s\n", $converted->toDecimalMinutes()); // 40 26.7717N, -79 56.93172W
printf("%s\n", $converted->toDM('%P%D°%N %p%d°%n')); // 40°26.7717 -79°56.93172
// convert to degrees minutes seconds without and with format string
printf("%s\n", $converted->toDegreesMinutesSeconds('<p>%P%D:%M:%S, %p%d:%m:%s</p>')); // <p>40:26:46, -79:56:56</p>
printf("%s\n", $converted->toDMS()); // 40°26′46″N, 79°56′56″W
// convert in the UTM projection (standard format)
printf("%s\n", $converted->toUniversalTransverseMercator()); // 17T 589138 4477813
printf("%s\n", $converted->toUTM()); // 17T 589138 4477813 (alias)

Here is the mapping:

Decimal minutes	Latitude	Longitude
Positive or negative sign	%P	%p
Direction	%L	%l
Degrees	%D	%d
Decimal minutes	%N	%n

Degrees minutes seconds	Latitude	Longitude
Positive or negative sign	%P	%p
Direction	%L	%l
Degrees	%D	%d
Minutes	%M	%m
Seconds	%S	%s

Distance

It provides methods to compute the distance in meter (by default), km, mi or ft between two coordinates using flat (most performant), great circle, haversine or vincenty (most accurate) algorithms.

Those coordinates should be in the same ellipsoid.

<?php

$geotools = new \League\Geotools\Geotools();
$coordA   = new \League\Geotools\Coordinate\Coordinate([48.8234055, 2.3072664]);
$coordB   = new \League\Geotools\Coordinate\Coordinate([43.296482, 5.36978]);
$distance = $geotools->distance()->setFrom($coordA)->setTo($coordB);

printf("%s\n",$distance->flat()); // 659166.50038742 (meters)
printf("%s\n",$distance->greatCircle()); // 659021.90812846
printf("%s\n",$distance->in('km')->haversine()); // 659.02190812846
printf("%s\n",$distance->in('mi')->vincenty()); // 409.05330679648
printf("%s\n",$distance->in('ft')->flat()); // 2162619.7519272

Point

It provides methods to compute the initial and final bearing in degrees, the initial and final cardinal direction, the middle point and the destination point. The middle and the destination points returns a \League\Geotools\Coordinate\Coordinate object with the same ellipsoid.

<?php

$geotools = new \League\Geotools\Geotools();
$coordA   = new \League\Geotools\Coordinate\Coordinate([48.8234055, 2.3072664]);
$coordB   = new \League\Geotools\Coordinate\Coordinate([43.296482, 5.36978]);
$vertex    =  $geotools->vertex()->setFrom($coordA)->setTo($coordB);

printf("%d\n", $vertex->initialBearing()); // 157 (degrees)
printf("%s\n", $vertex->initialCardinal()); // SSE (SouthSouthEast)
printf("%d\n", $vertex->finalBearing()); // 160 (degrees)
printf("%s\n", $vertex->finalCardinal()); // SSE (SouthSouthEast)

$middlePoint = $vertex->middle(); // \League\Geotools\Coordinate\Coordinate
printf("%s\n", $middlePoint->getLatitude()); // 46.070143125815
printf("%s\n", $middlePoint->getLongitude()); // 3.9152401085931

$destinationPoint = $geotools->vertex()->setFrom($coordA)->destination(180, 200000); // \League\Geotools\Coordinate\Coordinate
printf("%s\n", $destinationPoint->getLatitude()); // 47.026774650075
printf("%s\n", $destinationPoint->getLongitude()); // 2.3072664

Geohash

It provides methods to get the geo hash and its bounding box's coordinates (SouthWest & NorthEast) of a coordinate and the coordinate and its bounding box's coordinates (SouthWest & NorthEast) of a geo hash.

<?php

$geotools       = new \League\Geotools\Geotools();
$coordToGeohash = new \League\Geotools\Coordinate\Coordinate('43.296482, 5.36978');

// encoding
$encoded = $geotools->geohash()->encode($coordToGeohash, 4); // 12 is the default length / precision
// encoded
printf("%s\n", $encoded->getGeohash()); // spey
// encoded bounding box
$boundingBox = $encoded->getBoundingBox(); // array of \League\Geotools\Coordinate\CoordinateInterface
$southWest   = $boundingBox[0];
$northEast   = $boundingBox[1];
printf("http://www.openstreetmap.org/?minlon=%s&minlat=%s&maxlon=%s&maxlat=%s&box=yes\n",
    $southWest->getLongitude(), $southWest->getLatitude(),
    $northEast->getLongitude(), $northEast->getLatitude()
); // http://www.openstreetmap.org/?minlon=5.2734375&minlat=43.2421875&maxlon=5.625&maxlat=43.41796875&box=yes

// decoding
$decoded = $geotools->geohash()->decode('spey61y');
// decoded coordinate
printf("%s\n", $decoded->getCoordinate()->getLatitude()); // 43.296432495117
printf("%s\n", $decoded->getCoordinate()->getLongitude()); // 5.3702545166016
// decoded bounding box
$boundingBox = $decoded->getBoundingBox(); //array of \League\Geotools\Coordinate\CoordinateInterface
$southWest   = $boundingBox[0];
$northEast   = $boundingBox[1];
printf("http://www.openstreetmap.org/?minlon=%s&minlat=%s&maxlon=%s&maxlat=%s&box=yes\n",
    $southWest->getLongitude(), $southWest->getLatitude(),
    $northEast->getLongitude(), $northEast->getLatitude()
); // http://www.openstreetmap.org/?minlon=5.3695678710938&minlat=43.295745849609&maxlon=5.3709411621094&maxlat=43.297119140625&box=yes

10:10

Represent a location with 10m accuracy using a 10 character code that includes features to prevent errors in entering the code. Read more about the algorithm here.

<?php

$tenten = new \League\Geotools\Tests\Geohash\TenTen;
$tenten->encode(new Coordinate([51.09559, 1.12207])); // MEQ N6G 7NY5

Vertex

Represents a segment with a direction. You can find if two vertexes are on the same line.

<?php
	$vertexA->setFrom(48.8234055);
	$vertexA->setTo(2.3072664);

	$vertexB->setFrom(48.8234055);
	$vertexB->setTo(2.3072664);
	$vertexA->isOnSameLine($vertexB);

Polygon

It helps you to know if a point (coordinate) is in a Polygon or on the Polygon's boundaries and if this in on a Polygon's vertex.

First you need to create the polygon, you can provide:

• an array of arrays
• an array of Coordinate
• a CoordinateCollection

<?php

$polygon = new \League\Geotools\Polygon\Polygon([
    [48.9675969, 1.7440796],
    [48.4711003, 2.5268555],
    [48.9279131, 3.1448364],
    [49.3895245, 2.6119995],
]);

$polygon->setPrecision(5); // set the comparision precision
$polygon->pointInPolygon(new \League\Geotools\Coordinate\Coordinate([49.1785607, 2.4444580])); // true
$polygon->pointInPolygon(new \League\Geotools\Coordinate\Coordinate([49.1785607, 5])); // false
$polygon->pointOnBoundary(new \League\Geotools\Coordinate\Coordinate([48.7193486, 2.13546755])); // true
$polygon->pointOnBoundary(new \League\Geotools\Coordinate\Coordinate([47.1587188, 2.87841795])); // false
$polygon->pointOnVertex(new \League\Geotools\Coordinate\Coordinate([48.4711003, 2.5268555])); // true
$polygon->pointOnVertex(new \League\Geotools\Coordinate\Coordinate([49.1785607, 2.4444580])); // false
$polygon->getBoundingBox(); // return the BoundingBox object

Unit Tests

To run unit tests, you'll need the cURL extension and a set of dependencies, you can install them using Composer:

$ php composer.phar install --dev

Once installed, just launch the following command:

$ phpunit --coverage-text

Credits

• Antoine Corcy
• Pascal Borreli
• Phil Sturgeon
• Gabriel Bull
• All contributors

Contributor Code of Conduct

As contributors and maintainers of this project, we pledge to respect all people who contribute through reporting issues, posting feature requests, updating documentation, submitting pull requests or patches, and other activities.

We are committed to making participation in this project a harassment-free experience for everyone, regardless of level of experience, gender, gender identity and expression, sexual orientation, disability, personal appearance, body size, race, age, or religion.

Examples of unacceptable behavior by participants include the use of sexual language or imagery, derogatory comments or personal attacks, trolling, public or private harassment, insults, or other unprofessional conduct.

Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct. Project maintainers who do not follow the Code of Conduct may be removed from the project team.

Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by opening an issue or contacting one or more of the project maintainers.

This Code of Conduct is adapted from the Contributor Covenant, version 1.0.0, available at http://contributor-covenant.org/version/1/0/0/

License

Geotools is released under the MIT License. See the bundled LICENSE file for details.