geo

README

go-geo

Package geo provides functions of geographic functionality.

Documentation

Overview

Package geo provides functions of geographic functionality.

Index

• func Distance(lat1, lng1, lat2, lng2 float64) float64
• func Distance32(lat1, lng1, lat2, lng2 float32) float32
• func ELng(lng float64) float64
• func ELng32(lng float32) float32
• func EwLng(lng float64) float64
• func EwLng32(lng float32) float32
• type Poly
  • func (p Poly) Contains(point Pt) bool
• type Pt
• type Pt64

Functions

func Distance

func Distance(lat1, lng1, lat2, lng2 float64) float64

Distance calculates distance in miles between two lat/lng values.

func Distance32

func Distance32(lat1, lng1, lat2, lng2 float32) float32

Distance calculates distance in miles between two lat/lng values.

func ELng

func ELng(lng float64) float64

ELng converts lng to a full east longitude value [0, 360)

func ELng32

func ELng32(lng float32) float32

ELng converts lng to a full east longitude value [0, 360)

func EwLng

func EwLng(lng float64) float64

EwLng converts lng to a east/west longitude value [-180, 180)

func EwLng32

func EwLng32(lng float32) float32

EwLng converts lng to a east/west longitude value [-180, 180)

Types

type Poly

type Poly struct {
	Pts [](Pt)
}

Poly is a polygon represented by series of points. The lines of a polygon must be non-intersecting. Every simple polygon must begin and end with the same point. If a point is repeated, it is assumed to complete the polygon. A complex polygon with holesand/or islands is represented by sequential points representing complete simple polygons.

func (Poly) Contains

func (p Poly) Contains(point Pt) bool

Contains performs a point-in-polygon test.

type Pt

type Pt struct {
	Lat, Lng float32
}

Pt is a representation of a 2D point. float32 is used to save 50% of the space - as this can add up with large polygons.

type Pt64

type Pt64 struct {
	Lat, Lng float64
}