geo

package
v0.0.13-a Latest Latest
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This package is not in the latest version of its module.

 Go to latest Published: Jun 15, 2016 License: MIT Imports: 9 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	EarthRad = 6372800 //meters
	RadToDeg = 180 / math.Pi
	DegToRad = math.Pi / 180
)
View Source 
const (
	PolygonFeature = "polygon"
	LineFeature    = "line"
	PointFeature   = "point"
)

Variables

View Source 
var (
	RtreeMinChildren = 25
	RtreeMaxChildren = 50
)

Functions

func QuadKey 

func QuadKey(c Coordinate, zoom int) tiles.Quadkey

func UnmarshalGeojsonFeature 

func UnmarshalGeojsonFeature(raw string) (feature *geojson.Feature, err error)

Types

type Box 

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

func NewBox 

func NewBox(min, max Coordinate) (box Box, err error)

func (Box) Contains 

func (b Box) Contains(coords ...Coordinate) (in bool)

func (Box) NorthEast 

func (b Box) NorthEast() Coordinate

func (Box) SouthWest 

func (b Box) SouthWest() Coordinate

type BruteFence 

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

func NewBruteFence 

func NewBruteFence() *BruteFence

func (*BruteFence) Add 

func (b *BruteFence) Add(f *Feature)

func (*BruteFence) Get 

func (b *BruteFence) Get(c Coordinate) []*Feature

func (*BruteFence) Size 

func (b *BruteFence) Size() int

type Coordinate 

type Coordinate struct {
	Lat, Lon float64
}

func (Coordinate) Difference 

func (c Coordinate) Difference(o Coordinate) (d Coordinate)

func (Coordinate) Distance 

func (cd Coordinate) Distance(od Coordinate) float64

Distance between coordinates in meters

func (Coordinate) String 

func (c Coordinate) String() string

func (Coordinate) ToRad 

func (c Coordinate) ToRad() Coordinate

func (Coordinate) ToTile 

func (c Coordinate) ToTile(zoom int) (tile tiles.Tile)

func (Coordinate) X 

func (c Coordinate) X() float64

func (Coordinate) Y 

func (c Coordinate) Y() float64

type Feature 

type Feature struct {
	ID         interface{}
	Geometry   []*Shape
	Type       string
	Properties map[string]interface{}
}

func GeojsonFeatureAdapter 

func GeojsonFeatureAdapter(gj *geojson.Feature) (feature *Feature, err error)

Flatten all the points of a feature into single list. This can hel in identifying which tiles are going to be created

func MakeFeature 

func MakeFeature(length int) *Feature

func NewFeature 

func NewFeature(geometryType string, geometry ...*Shape) *Feature

func NewLineFeature 

func NewLineFeature(geometry ...*Shape) *Feature

func NewPointFeature 

func NewPointFeature(geometry ...*Shape) *Feature

func NewPolygonFeature 

func NewPolygonFeature(geometry ...*Shape) *Feature

func (*Feature) AddShape 

func (f *Feature) AddShape(s *Shape)

func (*Feature) Center 

func (f *Feature) Center() (avg Coordinate)

func (*Feature) Contains 

func (f *Feature) Contains(c Coordinate) bool

Only checks as exterior ring TODO account for interior rings

func (*Feature) Tags 

func (f *Feature) Tags(key string) string

type Fence 

type Fence interface {
	Add(f *Feature)
	GetFeatures(f *Feature) []*Feature
	Size() int
}

type GeojsonSource 

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

func NewGeojsonSource 

func NewGeojsonSource(path string, filter []string) *GeojsonSource

func (*GeojsonSource) Publish 

func (gj *GeojsonSource) Publish() (features chan *Feature, err error)

type Rfence 

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

func NewRfence 

func NewRfence() *Rfence

func (*Rfence) Add 

func (r *Rfence) Add(f *Feature)

func (*Rfence) Get 

func (r *Rfence) Get(c Coordinate) []*Feature

func (*Rfence) Size 

func (r *Rfence) Size() int

type Rnode 

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

func (*Rnode) Bounds 

func (n *Rnode) Bounds() *rtreego.Rect

implements rtree.Spatial

func (*Rnode) Feature 

func (n *Rnode) Feature() *Feature

func (*Rnode) Value 

func (n *Rnode) Value() interface{}

type Rtree 

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

func NewRtree 

func NewRtree() *Rtree

func (*Rtree) Contains 

func (r *Rtree) Contains(c Coordinate) []*Rnode

func (*Rtree) Insert 

func (r *Rtree) Insert(s *Shape, data interface{})

func (*Rtree) Intersections 

func (r *Rtree) Intersections(q *Shape) []*Rnode

type Shape 

type Shape struct {
	Coordinates []Coordinate
}

func MakeShape 

func MakeShape(length int) *Shape

func NewShape 

func NewShape(coords ...Coordinate) *Shape

func ShapeFromString 

func ShapeFromString(raw string) (shp *Shape, err error)

[[lon,lat]...]

func (*Shape) Add 

func (s *Shape) Add(c ...Coordinate)

func (*Shape) Append 

func (s *Shape) Append(o *Shape)

func (*Shape) BoundingBox 

func (s *Shape) BoundingBox() Box

func (*Shape) Contains 

func (s *Shape) Contains(c Coordinate) bool

func (*Shape) Edges 

func (s *Shape) Edges() <-chan []Coordinate

func (*Shape) Head 

func (s *Shape) Head() Coordinate

func (*Shape) IsClockwise 

func (s *Shape) IsClockwise() bool

func (*Shape) IsClosed 

func (s *Shape) IsClosed() bool

Only shapes that contain an area can be closed (>3 Coordinates)

func (*Shape) Length 

func (s *Shape) Length() int

Number of coordinates

func (*Shape) Reverse 

func (s *Shape) Reverse()

func (*Shape) Tail 

func (s *Shape) Tail() Coordinate

Source Files

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