geo

package module
Version: v0.0.0-...-39cb6ef Latest Latest
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Published: Sep 25, 2018 License: MIT Imports: 8 Imported by: 3

README

geo

release-candidate  Build Status

TODO

$ go install github.com/scheibo/geo

The generated GoDoc can be viewed at godoc.org/github.com/scheibo/geo.

Documentation

Index

Constants

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const EARTH_RADIUS = 6371008.8 // m
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const MAX_LOCATIONS_PER_REQUEST = 512

MAX_LOCATIONS_PER_REQUEST is the maximum number of 'lat,lng' pairs the Google Maps API allows in a single request.

Variables

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var AverageDirection = AverageBearing

AverageDirection is an alias for AverageBearing.

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var AverageDirectionZ = AverageBearingZ

AverageDirection is an alias for AverageBearing.

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var Centroid = Average

Centroid is an alias for Average.

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var CentroidZ = AverageZ

CentroidZ is an alias for AverageZ.

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var DEGREES_TO_RADIANS = math.Pi / 180.0
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var Direction = Bearing

Direction is an alias for Bearing.

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var GeographicMidpoint = Average

GeographicMidpoint is an alias for Average.

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var GeographicMidpointZ = AverageZ

GeographicMidpointZ is an alias for AverageZ.

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var GreatCircleDistance = Distance

GreatCircleDistance is an alias for Distance.

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var HaversineDistance = Distance

HaversineDistance is an alias for Distance.

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var RADIANS_TO_DEGREES = 180.0 / math.Pi

Functions

func AverageBearing

func AverageBearing(pts []LatLng) float64

AverageBearing computes the mean bearing for the set of points pts. See: https://en.wikipedia.org/wiki/Mean_of_circular_quantities

func AverageBearingZ

func AverageBearingZ(lles []LatLngEle) float64

AverageBearingZ computes the mean bearing for the set of points pts.

func Bearing

func Bearing(p1, p2 LatLng) float64

Bearing computes the bearing/direction to travel from p1 to p2 in degrees. See: http://www.movable-type.co.uk/scripts/latlong.html

func Coordinate

func Coordinate(coord float64) string

func Distance

func Distance(p1, p2 LatLng) float64

Distance calculates the Haversine distance between two points in metres. See: http://www.movable-type.co.uk/scripts/latlong.html

func EncodePolyline

func EncodePolyline(lls []LatLng) string

EncodePolyline returns a new encoded Polyline from the given LatLng points.

func EncodeZPolyline

func EncodeZPolyline(lles []LatLngEle) string

EncodeZPolyline returns a new encoded ZPolyline from the given LatLngEle points.

Types

type Client

type Client struct {
	// contains filtered or unexported fields
}

Client may be used to access methods which rely upon the Google Maps API.

func NewClient

func NewClient(key ...string) (*Client, error)

NewClient returns a new client that can access the Google Maps API.

func (*Client) Elevation

func (c *Client) Elevation(lls []LatLng) ([]LatLngEle, error)

Elevation determines the elevation for each 'lat,lng' pair in ll.

type LatLng

type LatLng struct {
	Lat float64 `json:"lat"`
	Lng float64 `json:"lng"`
}

LatLng represents a 'latitude,longitude' pair.

func Average

func Average(lls []LatLng) LatLng

Average returns a LatLng object representing the average of the given points.

func DecodePolyline

func DecodePolyline(s string) ([]LatLng, error)

DecodePolyline converts a polyline encoded string to an array of LatLng objects

func LatLngs

func LatLngs(lles []LatLngEle) []LatLng

LatLngs converts lles from LatLngEles to LatLngs.

func ParseLatLng

func ParseLatLng(s string) (LatLng, error)

ParseLatLng will parse a string representation of a 'lat,lng' pair.

func ParseLatLngs

func ParseLatLngs(s string) ([]LatLng, error)

ParseLatLngs parses a string of | separated 'lat,lng' pairs.

func (*LatLng) String

func (ll *LatLng) String() string

type LatLngEle

type LatLngEle struct {
	Lat float64 `json:"lat"`
	Lng float64 `json:"lng"`
	Ele float64 `json:"ele",omitempty`
}

LatLngEle represents a 'latitude,longitude,elevation' triple.

func AverageZ

func AverageZ(lles []LatLngEle) LatLngEle

AverageZ returns a LatLngEle object representing the average of the given points.

func DecodeZPolyline

func DecodeZPolyline(s string) ([]LatLngEle, error)

DecodeZPolyline converts a z-polyline encoded string to an array of LatLngEle objects

func ParseLatLngEle

func ParseLatLngEle(s string) (LatLngEle, error)

ParseLatLngEle will parse a string representation of a 'lat,lng,ele' triples.

func ParseLatLngEles

func ParseLatLngEles(s string) ([]LatLngEle, error)

ParseLatLngEles parses a string of | separated 'lat,lng,ele' triples.

func (*LatLngEle) LatLng

func (lle *LatLngEle) LatLng() LatLng

func (*LatLngEle) String

func (lle *LatLngEle) String() string

type Polyline

type Polyline struct {
	Points string `json:"points"`
}

Polyline represents a list of lat,lng points encoded as a byte array. See: https://developers.google.com/maps/documentation/utilities/polylinealgorithm

func (*Polyline) Decode

func (p *Polyline) Decode() ([]LatLng, error)

Decode converts this encoded Polyline to an array of LatLng objects.

type ZPolyline

type ZPolyline struct {
	Points string `json:"points"`
}

ZPolyline represents a list of lat,lng,ele points encoded as a byte array, extending the standard polyline encoding algorithm.

func (*ZPolyline) Decode

func (p *ZPolyline) Decode() ([]LatLngEle, error)

Decode converts this encoded ZPolyline to an array of LatLngEle objects.

Source Files

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