tiles

package

v0.0.0-...-1f4f1c7 Latest Latest Go to latest Published: Mar 30, 2022 License: MIT Imports: 2 Imported by: 0

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Repository

github.com/brendan-ward/arrowtiler

Links

Open Source Insights

Documentation ¶

Index ¶

Variables
func GeoToMercator(lon float64, lat float64) (x float64, y float64)
func TileRange(zoom uint8, bounds [4]float64) (*TileID, *TileID)
type EncodingConfig
- func NewDefaultEncodingConfig() *EncodingConfig
- func NewEncodingConfig(extent uint16, buffer uint16, precision uint8, simplification uint8, ...) *EncodingConfig
type TileID
- func GeoToTile(zoom uint8, x float64, y float64) *TileID
- func NewTileID(zoom uint8, x uint32, y uint32) *TileID

Constants ¶

This section is empty.

Variables ¶

View Source

var CE float64 = 2.0 * ORIGIN

View Source

var DEG2RAD float64 = math.Pi / 180.0

View Source

var ORIGIN = RE * math.Pi

View Source

var RE float64 = 6378137.0

Functions ¶

func GeoToMercator ¶

func GeoToMercator(lon float64, lat float64) (x float64, y float64)

func TileRange ¶

func TileRange(zoom uint8, bounds [4]float64) (*TileID, *TileID)

TileRange calculates the min tile x, min tile y, max tile x, max tile y tile range for Mercator coordinates xmin, ymin, xmax, ymax at a given zoom level. Assumes bounds have already been clipped to Mercator world bounds.

Types ¶

type EncodingConfig ¶

type EncodingConfig struct {
	Extent                uint16
	Buffer                uint16
	Precision             uint8
	Simplification        uint8
	SimplificationMaxZoom uint8
}

EncodingParams holds parameters used for encoding tiles

func NewDefaultEncodingConfig ¶

func NewDefaultEncodingConfig() *EncodingConfig

func NewEncodingConfig ¶

func NewEncodingConfig(extent uint16, buffer uint16, precision uint8, simplification uint8, simplificationMaxZoom uint8) *EncodingConfig

type TileID ¶

type TileID struct {
	Zoom uint8
	X    uint32
	Y    uint32
}

WebMercator tile, numbered starting from upper left

func GeoToTile ¶

func GeoToTile(zoom uint8, x float64, y float64) *TileID

GeoToTile calculates the tile x,y at zoom that contains longitude, latitude

func NewTileID ¶

func NewTileID(zoom uint8, x uint32, y uint32) *TileID

func (*TileID) GeoBounds ¶

func (t *TileID) GeoBounds() (float64, float64, float64, float64)

func (*TileID) MercatorBounds ¶

func (t *TileID) MercatorBounds() (float64, float64, float64, float64)

func (*TileID) String ¶

func (t *TileID) String() string

Source Files ¶

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