element

Documentation

Overview

Package element provides basic types for OSM elements (coords/nodes/ways/relations/etc).

Index

• Constants
• Variables
• func TryCloseWay(refs []int64, nodes []Node, maxGap float64) bool
• type Geometry
• type IdRefs
  • func (idRefs *IdRefs) Add(ref int64)
  • func (idRefs *IdRefs) Delete(ref int64)
• type Member
• type MemberType
• type Node
• type OSMElem
• type Relation
• type Tags
  • func (t *Tags) String() string
• type Way
  • func (w *Way) IsClosed() bool
  • func (w *Way) TryClose(maxGap float64) bool

Constants

const (
	NODE     MemberType = 0
	WAY                 = 1
	RELATION            = 2
)

const RelIdOffset = -1e17

RelIdOffset is a constant we subtract from relation IDs to avoid conflicts with way and node IDs. Nodes, ways and relations have separate ID spaces in OSM, but we need unique IDs for updating and removing elements in diff mode. In a normal diff import relation IDs are negated to distinguish them from way IDs, because ways and relations can both be imported in the same polygon table. Nodes are only imported together with ways and relations in single table imports (see `type_mappings`). In this case we negate the way and relation IDs and aditionaly subtract RelIdOffset from the relation IDs. Ways will go from -0 to -100,000,000,000,000,000, relations from -100,000,000,000,000,000 down wards.

Variables

var MemberTypeValues = map[string]MemberType{
	"node":     NODE,
	"way":      WAY,
	"relation": RELATION,
}

Functions

func TryCloseWay

func TryCloseWay(refs []int64, nodes []Node, maxGap float64) bool

TryCloseWay closes the way if both end nodes are nearly identical. Returns true if it succeeds.

Types

type Geometry

type Geometry struct {
	Geom *geos.Geom
	Wkb  []byte
}

type IdRefs

type IdRefs struct {
	Id   int64
	Refs []int64
}

func (*IdRefs) Add

func (idRefs *IdRefs) Add(ref int64)

func (*IdRefs) Delete

func (idRefs *IdRefs) Delete(ref int64)

type Member

type Member struct {
	Id   int64      `json:"id"`
	Type MemberType `json:"type"`
	Role string     `json:"role"`
	Way  *Way       `json:"-"`
}

type MemberType

type MemberType int

type Node

type Node struct {
	OSMElem
	Lat  float64 `json:"lat"`
	Long float64 `json:"lon"`
}

type OSMElem

type OSMElem struct {
	Id   int64     `json:"-"`
	Tags Tags      `json:"tags,omitempty"`
	Geom *Geometry `json:"-"`
}

type Relation

type Relation struct {
	OSMElem
	Members []Member `json:"members"`
}

type Tags

type Tags map[string]string

func (*Tags) String

func (t *Tags) String() string

type Way

type Way struct {
	OSMElem
	Refs  []int64 `json:"refs"`
	Nodes []Node  `json:"nodes,omitempty"`
}

func (*Way) IsClosed

func (w *Way) IsClosed() bool

func (*Way) TryClose

func (w *Way) TryClose(maxGap float64) bool