6257ddba78
The big change is that the GeoJSON package has been completely rewritten to fix a few of geometry calculation bugs, increase performance, and to better follow the GeoJSON spec RFC 7946. GeoJSON updates - A LineString now requires at least two points. - All json members, even foreign, now persist with the object. - The bbox member persists too but is no longer used for geometry calculations. This is change in behavior. Previously Tile38 would treat the bbox as the object's physical rectangle. - Corrections to geometry intersects and within calculations. Faster spatial queries - The performance of Point-in-polygon and object intersect operations are greatly improved for complex polygons and line strings. It went from O(n) to roughly O(log n). - The same for all collection types with many children, including FeatureCollection, GeometryCollection, MultiPoint, MultiLineString, and MultiPolygon. Codebase changes - The pkg directory has been renamed to internal - The GeoJSON internal package has been moved to a seperate repo at https://github.com/tidwall/geojson. It's now vendored. Please look out for higher memory usage for datasets using complex shapes. A complex shape is one that has 64 or more points. For these shapes it's expected that there will be increase of least 54 bytes per point. |
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| .. | ||
| .appveyor.yml | ||
| .gitignore | ||
| .travis.yml | ||
| LICENSE | ||
| README.md | ||
| README.tmpl | ||
| asm_x86.s | ||
| base32.go | ||
| benchmark_test.go | ||
| decodecases_test.go | ||
| example_test.go | ||
| extensive_test.go | ||
| geohash.go | ||
| geohash_test.go | ||
| geohash_x86.go | ||
| neighbors_testcases_test.go | ||
| stubs.s | ||
| testcases_test.go | ||
| util_test.go | ||
README.md
geohash
Go geohash library offering encoding and decoding for string and integer geohashes.
Install
Fetch the package with
go get github.com/mmcloughlin/geohash
And import it into your programs with
import "github.com/mmcloughlin/geohash"
Usage
func Decode
func Decode(hash string) (lat, lng float64)
Decode the string geohash to a (lat, lng) point.
func DecodeCenter
func DecodeCenter(hash string) (lat, lng float64)
DecodeCenter decodes the string geohash to the central point of the bounding box.
func DecodeInt
func DecodeInt(hash uint64) (lat, lng float64)
DecodeInt decodes the provided 64-bit integer geohash to a (lat, lng) point.
func DecodeIntWithPrecision
func DecodeIntWithPrecision(hash uint64, bits uint) (lat, lng float64)
DecodeIntWithPrecision decodes the provided integer geohash with bits of precision to a (lat, lng) point.
func Encode
func Encode(lat, lng float64) string
Encode the point (lat, lng) as a string geohash with the standard 12 characters of precision.
func EncodeInt
func EncodeInt(lat, lng float64) uint64
EncodeInt encodes the point (lat, lng) to a 64-bit integer geohash.
func EncodeIntWithPrecision
func EncodeIntWithPrecision(lat, lng float64, bits uint) uint64
EncodeIntWithPrecision encodes the point (lat, lng) to an integer with the specified number of bits.
func EncodeWithPrecision
func EncodeWithPrecision(lat, lng float64, chars uint) string
EncodeWithPrecision encodes the point (lat, lng) as a string geohash with the specified number of characters of precision (max 12).
func Neighbor
func Neighbor(hash string, direction Direction) string
Neighbor returns a geohash string that corresponds to the provided geohash's neighbor in the provided direction
func NeighborInt
func NeighborInt(hash uint64, direction Direction) uint64
NeighborInt returns a uint64 that corresponds to the provided hash's neighbor in the provided direction at 64-bit precision.
func NeighborIntWithPrecision
func NeighborIntWithPrecision(hash uint64, bits uint, direction Direction) uint64
NeighborIntWithPrecision returns a uint64s that corresponds to the provided hash's neighbor in the provided direction at the given precision.
func Neighbors
func Neighbors(hash string) []string
Neighbors returns a slice of geohash strings that correspond to the provided geohash's neighbors.
func NeighborsInt
func NeighborsInt(hash uint64) []uint64
NeighborsInt returns a slice of uint64s that correspond to the provided hash's neighbors at 64-bit precision.
func NeighborsIntWithPrecision
func NeighborsIntWithPrecision(hash uint64, bits uint) []uint64
NeighborsIntWithPrecision returns a slice of uint64s that correspond to the provided hash's neighbors at the given precision.
type Box
type Box struct {
MinLat float64
MaxLat float64
MinLng float64
MaxLng float64
}
Box represents a rectangle in latitude/longitude space.
func BoundingBox
func BoundingBox(hash string) Box
BoundingBox returns the region encoded by the given string geohash.
func BoundingBoxInt
func BoundingBoxInt(hash uint64) Box
BoundingBoxInt returns the region encoded by the given 64-bit integer geohash.
func BoundingBoxIntWithPrecision
func BoundingBoxIntWithPrecision(hash uint64, bits uint) Box
BoundingBoxIntWithPrecision returns the region encoded by the integer geohash with the specified precision.
func (Box) Center
func (b Box) Center() (lat, lng float64)
Center returns the center of the box.
func (Box) Contains
func (b Box) Contains(lat, lng float64) bool
Contains decides whether (lat, lng) is contained in the box. The containment test is inclusive of the edges and corners.
func (Box) Round
func (b Box) Round() (lat, lng float64)
Round returns a point inside the box, making an effort to round to minimal precision.
type Direction
type Direction int
Direction represents directions in the latitute/longitude space.
const (
North Direction = iota
NorthEast
East
SouthEast
South
SouthWest
West
NorthWest
)
Cardinal and intercardinal directions