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Vendor clonix
Package geokit
Short Description Geo-Toolkit for PHP
License MIT
Homepage https://github.com/jsor/geokit

Keywords geo geometry geography

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Informations about the package geokit

Geokit

Geokit is a PHP toolkit to solve geo-related tasks like:

Distance calculations.
Heading, midpoint and endpoint calculations.
Rectangular bounding box calculations.

Installation
Reference
- Math
  - Distance calculations
  - Transformations
  - Other calculations
- Distance
- Position
- BoundingBox
- Polygon
License
Credits

Installation

Install the latest version with Composer.

Check the Packagist page for all available versions.

Reference

Math

A Math instance can be used to perform geographic calculations on Position and BoundingBox instances.

The World Geodetic System 1984 (WGS84) is exclusively used as the coordinate reference system.

Distance calculations

A math instance provides two methods to calculate the distance between 2 points on the Earth's surface:

distanceHaversine(Geokit\Position $from, Geokit\Position $to): Calculates the approximate sea level great circle (Earth) distance between two points using the Haversine formula.
distanceVincenty(Geokit\Position $from, Geokit\Position $to): Calculates the geodetic distance between two points using the Vincenty inverse formula for ellipsoids.

Both methods return a Distance instance.

Transformations

The circle() method calculates a closed circle Polygon given a center, radius and steps for precision.

Other calculations

Other useful methods are:

heading(Geokit\Position $from, Geokit\Position $to): Calculates the (initial) heading from the first point to the second point in degrees.
midpoint(Geokit\Position $from, Geokit\Position $to): Calculates an intermediate point on the geodesic between the two given points.
endpoint(Geokit\Position $start, float $heading, Geokit\Distance $distance): Calculates the destination point along a geodesic, given an initial heading and distance, from the given start point.

Distance

A Distance instance allows for a convenient representation of a distance unit of measure.

A Distance can also be created from a string with an optional unit.

Position

A Position is a fundamental construct representing a geographical position in x (or longitude) and y (or latitude) coordinates.

Note, that x/y coordinates are kept as is, while longitude/latitude are normalized.

Longitudes range between -180 and 180 degrees, inclusive. Longitudes above 180 or below -180 are normalized. For example, 480, 840 and 1200 will all be normalized to 120 degrees.
Latitudes range between -90 and 90 degrees, inclusive. Latitudes above 90 or below -90 are normalized. For example, 100 will be normalized to 80 degrees.

BoundingBox

A BoundingBox instance represents a rectangle in geographical coordinates, including one that crosses the 180 degrees longitudinal meridian.

It is constructed from its left-bottom (south-west) and right-top (north-east) corner points.

With the expand() and shrink() methods, you can expand or shrink a BoundingBox instance by a distance.

The toPolygon() method converts the BoundingBox to an equivalent Polygon instance.

Polygon

A Polygon instance represents a two-dimensional shape of connected line segments and may either be closed (the first and last point are the same) or open.

License

Credits

Geokit has been inspired and/or contains ported code from the following libraries:

All versions of geokit with dependencies

PHP Build Version

Package Version

Version v2.0 Release 10. Jul 2020
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