geo

package

v0.7.0 Latest Latest Go to latest Published: Dec 8, 2016 License: Apache-2.0 Imports: 11 Imported by: 0

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Repository

github.com/akhenakh/dgraph

Links

Open Source Insights

Documentation ¶

Index ¶

Constants
func EarthAngle(dist float64) s1.Angle
func FilterUids(uids *task.List, values []*task.Value, q *QueryData) *task.List
func IndexTokens(g *types.Geo) ([]string, error)
func Intersects(l1 *s2.Loop, l2 *s2.Loop) bool
func IsGeoFunc(str string) bool
type Area
- func EarthArea(a float64) Area
- func (a Area) String() string
type Length
- func EarthDistance(angle s1.Angle) Length
- func (l Length) String() string
type QueryData
- func GetTokens(funcArgs []string) ([]string, *QueryData, error)
- func (q QueryData) MatchesFilter(g types.Geo) bool
type QueryType

Constants ¶

View Source

const (
	// MinCellLevel is the smallest cell level (largest cell size) used by indexing
	MinCellLevel = 5 // Approx 250km x 380km
	// MaxCellLevel is the largest cell leve (smallest cell size) used by indexing
	MaxCellLevel = 16 // Approx 120m x 180m
	// MaxCells is the maximum number of cells to use when indexing regions.
	MaxCells = 18
)

View Source

const EarthRadiusMeters = 1000 * 6371

EarthRadiusMeters is the radius of the earth in meters (in a spherical earth model).

Variables ¶

This section is empty.

Functions ¶

func EarthAngle ¶

func EarthAngle(dist float64) s1.Angle

EarthAngle converts a to distance on earth in meters to an angle

func FilterUids ¶

func FilterUids(uids *task.List, values []*task.Value, q *QueryData) *task.List

FilterUids filters the uids based on the corresponding values and QueryData.

func IndexTokens ¶

func IndexTokens(g *types.Geo) ([]string, error)

IndexTokens returns the tokens to be used in a geospatial index for the given geometry. If the geometry is not supported it returns an error.

func Intersects ¶

func Intersects(l1 *s2.Loop, l2 *s2.Loop) bool

Intersects returns true if the two loops intersect.

func IsGeoFunc ¶

func IsGeoFunc(str string) bool

IsGeoFunc returns if a function is of geo type.

Types ¶

type Area ¶

type Area float64

Area denotes an area on Earth

func EarthArea ¶

func EarthArea(a float64) Area

EarthArea converts an area on the unit sphere to an area on earth in sq. meters.

func (Area) String ¶

func (a Area) String() string

String converts the area to human readable units

type Length ¶

type Length float64

Length denotes a length on Earth

func EarthDistance ¶

func EarthDistance(angle s1.Angle) Length

EarthDistance converts an angle to distance on earth in meters.

func (Length) String ¶

func (l Length) String() string

String converts the length to human readable units

type QueryData ¶

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

QueryData is internal data used by the geo query filter to additionally filter the geometries.

func GetTokens ¶

func GetTokens(funcArgs []string) ([]string, *QueryData, error)

GetTokens returns the corresponding index keys based on the type of function.

func (QueryData) MatchesFilter ¶

func (q QueryData) MatchesFilter(g types.Geo) bool

MatchesFilter applies the query filter to a geo value

type QueryType ¶

type QueryType byte

QueryType indicates the type of geo query.

const (
	// QueryTypeWithin finds all points that are within the given geometry
	QueryTypeWithin QueryType = iota
	// QueryTypeContains finds all polygons that contain the given point
	QueryTypeContains
	// QueryTypeIntersects finds all objects that intersect the given geometry
	QueryTypeIntersects
	// QueryTypeNear finds all points that are within the given distance from the given point.
	QueryTypeNear
)

Source Files ¶

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