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Informations about the package phpgeo
phpgeo - A Simple Geo Library for PHP
phpgeo provides abstractions to geographical coordinates (including support for different ellipsoids) and allows you to calculate geographical distances between coordinates with high precision.
- Requirements
- Documentation
- Installation
- Features
- License
- Examples/Usage
- Distance between two coordinates (Vincenty's Formula)
- Simplifying a polyline
- Polygon contains a point (e.g. "GPS geofence")
- Formatted output of coordinates
- Decimal Degrees
- Degrees/Minutes/Seconds (DMS)
- GeoJSON
- Credits
Requirements
Minimum required PHP version is 7.0.
Documentation
The documentation is available at https://phpgeo.marcusjaschen.de/
API documentation is available as well: https://phpgeo.marcusjaschen.de/api/master
Installation
Using Composer, just add it to your composer.json
by running:
License
Starting with version 2.0.0 phpgeo is licensed under the MIT license. Older versions were GPL-licensed.
Features
Info: Please visit the documentation site for complete and up-to-date documentation!
phpgeo provides the following features (follow the links for examples):
- abstractions of several geometry objects (coordinate/point, line, polyline/GPS track, polygon
- support for different ellipsoids, e. g. WGS-84
- length/distance/perimeter calculations with different implementations (Haversine, Vincenty)
- Geofence calculation, i. e. answering the question "Is this point contained in that area/polygon?"
- formatting and output of geometry objects
(GeoJSON, nice strings, e. g.
18° 54′ 41″ -155° 40′ 42″
) - calculation of bearing angle between two points (spherical or with Vincenty's formula)
- calculation of a destination point for a given starting point, bearing angle, and distance (spherical or with Vincenty's formula)
- calculation of the perpendicular distance between a point and a line
- getting segments of a polyline /polygon,
- reversing direction of polyline/polygon
Examples/Usage
This list is incomplete, please visit the documentation site for the full monty of documentation and examples!
Distance between two coordinates (Vincenty's Formula)
Use the calculator object directly:
or call the getDistance()
method of a Coordinate object by injecting a calculator object:
Simplifying a polyline
Polylines can be simplified to save storage space or bandwidth. Simplification is done with the Ramer–Douglas–Peucker algorithm (AKA Douglas-Peucker algorithm).
Polygon contains a point (e.g. "GPS geofence")
phpgeo has a polygon implementation which can be used to determinate if a point is contained in it or not.
A polygon consists of at least three points. Points are instances of the Coordinate
class.
Warning: The calculation gives wrong results if the polygons has points on both sides of the 180/-180 degrees meridian.
Formatted output of coordinates
You can format a coordinate in different styles.
Decimal Degrees
Degrees/Minutes/Seconds (DMS)
GeoJSON
Development
Run Tests
Before submitting a pull request, please be sure to run all checks and tests and ensure everything is green.
To run the checks and tests, it's the easiest to use the provided Composer scripts:
- lint PHP files for syntax errors:
composer ci:lint
- run static analysis with Psalm and report errors:
composer ci:psalm
- run unit tests with PHPUnit:
composer ci:tests
To run all checks and tests at once, just use composer ci
.
Of course, it's possible to use the test runners directly, e. g. for PHPUnit:
Psalm:
Miscellaneous
@clemdesign created a TypeScript port of phpgeo.
Credits
- Marcus Jaschen [email protected]
- Chris Veness - JavaScript implementation of the Vincenty formula for distance calculation
- Ersts,P.J., Horning, N., and M. Polin[Internet] Perpendicular Distance Calculator(version 1.2.2) Documentation. American Museum of Natural History, Center for Biodiversity and Conservation. Available from http://biodiversityinformatics.amnh.org/open_source/pdc. Accessed on 2013-07-07.
- W. Randolph Franklin, PNPOLY - Point Inclusion in Polygon Test Documentation
- Richard Barnes Polyline GeoJSON Formatter
- Paul Vidal Polygon Implementation