geoprojbase

Documentation

Overview

Package geoprojbase is a minimal dependency package that contains basic metadata and data structures for SRIDs and their CRS transformations.

Index

• Variables
• type Bounds
• type Proj4Text
  • func MakeProj4Text(str string) Proj4Text
  • func (p *Proj4Text) Bytes() []byte
  • func (p *Proj4Text) Equal(o Proj4Text) bool
  • func (p *Proj4Text) String() string
• type ProjInfo
  • func Projection(srid geopb.SRID) (ProjInfo, bool)

Variables

var Projections = map[geopb.SRID]ProjInfo{}/* 320 elements not displayed */

Projections is a mapping of SRID to projections. Use the `Projection` function to obtain one. This file is not spell checked.

Types

type Bounds

type Bounds struct {
	MinX float64
	MaxX float64
	MinY float64
	MaxY float64
}

Bounds represents the projected or lat/lng bounds.

type Proj4Text

type Proj4Text struct {
	// contains filtered or unexported fields
}

Proj4Text is the text representation of a PROJ4 transformation.

func MakeProj4Text

func MakeProj4Text(str string) Proj4Text

MakeProj4Text returns a new Proj4Text with spec based on the given string.

func (*Proj4Text) Bytes

func (p *Proj4Text) Bytes() []byte

Bytes returns the raw bytes for the given proj text.

func (*Proj4Text) Equal

func (p *Proj4Text) Equal(o Proj4Text) bool

Equal returns whether the two Proj4Texts are equal.

func (*Proj4Text) String

func (p *Proj4Text) String() string

String returns the string representation of the given proj text.

type ProjInfo

type ProjInfo struct {
	// SRID is the SRID of the projection.
	SRID geopb.SRID
	// AuthName is the authority who has provided this projection (e.g. ESRI, EPSG).
	AuthName string
	// AuthSRID is the SRID the given AuthName interprets the SRID as.
	AuthSRID int
	// SRText is the WKT representation of the projection.
	SRText string
	// Proj4Text is the PROJ4 text representation of the projection.
	Proj4Text Proj4Text

	// Bounds defines the bounds (projected or lat/lng) of the given coordinate system.
	// If nil, no bounds were defined for the given projection.
	Bounds *Bounds
	// IsLatLng stores whether the projection is a LatLng based projection (denormalized from above)
	IsLatLng bool
	// The spheroid represented by the SRID.
	Spheroid *geographiclib.Spheroid
}

ProjInfo is a struct containing metadata related to a given SRID.

func Projection

func Projection(srid geopb.SRID) (ProjInfo, bool)

Projection returns the ProjInfo identifier for the given SRID, as well as an bool indicating whether the projection exists.