geoprojbase

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

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

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.
	Bounds Bounds

	// IsLatLng stores whether the projection is a LatLng based projection (denormalized from above)
	IsLatLng bool
	// The spheroid represented by the SRID.
	Spheroid Spheroid
}

type Spheroid interface {
	Inverse(a, b s2.LatLng) (s12, az1, az2 float64)
	InverseBatch(points []s2.Point) float64
	AreaAndPerimeter(points []s2.Point) (area float64, perimeter float64)
	Project(point s2.LatLng, distance float64, azimuth s1.Angle) s2.LatLng
	Radius() float64
	Flattening() float64
	SphereRadius() float64
}