EPSG4326TileHelper

Provides coordinate conversion utilities between EPSG:4326 (WGS84) and tile coordinates. More...

Public Types
enum class	TileLocation {   e_center , e_north_east , e_south_west , e_south_east ,   e_north_west }
	Specifies a position within a map tile. More...

Public Member Functions
fltp08	tile_x_to_EPSG4326_lon_deg (uint04 x, uint04 z, fltp08 percent_x, fltp08 scale_factor=1.0) const
	Converts a tile X coordinate to longitude using a fractional position.
fltp08	tile_x_to_EPSG4326_lon_deg (uint04 x, uint04 z, TileLocation location, fltp08 scale_factor=1.0) const
	Converts a tile X coordinate to longitude in degrees.
fltp08	tile_y_to_EPSG4326_lat_deg (uint04 y, uint04 z, fltp08 percent_y, fltp08 scale_factor=1.0) const
	Converts a tile Y coordinate to latitude using a fractional position.
fltp08	tile_y_to_EPSG4326_lat_deg (uint04 y, uint04 z, TileLocation location, fltp08 scale_factor=1.0) const
	Converts a tile Y coordinate to latitude in degrees.

Static Public Member Functions
static uint01	CalcZoom (Bounds< 2, fltp08 > lat_long_bounds_wgs84_dd, Vector< 2, uint04 > size)
	Calculates the optimal zoom level for a geographic bounds and pixel size.
static EPSG4326TileHelper &	DefaultHelper ()
	Returns the singleton helper instance.
static fltp08	EPSG4326 (uint01 dim, fltp08 lon_deg, uint01 z, fltp08 scale_factor=1.0)
	Converts a geographic coordinate to tile space.
static Bounds< 2, fltp08 >	TileSpace (Bounds< 2, fltp08 > lat_long_bounds, Vector< 2, uint04 > size, fltp08 scale_factor=1.0)
	Computes the tile space bounds for a geographic bounding box.

Detailed Description

Provides coordinate conversion utilities between EPSG:4326 (WGS84) and tile coordinates.

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Definition at line 163 of file WebMercatorTiledImageManager.h.

Member Enumeration Documentation

TileLocation

enum class EPSG4326TileHelper::TileLocation

strong

Specifies a position within a map tile.

Enumerator
e_center	Center of the tile.
e_north_east	North-east corner.
e_south_west	South-west corner.
e_south_east	South-east corner.
e_north_west	North-west corner.

Definition at line 167 of file WebMercatorTiledImageManager.h.

Member Function Documentation

CalcZoom()

uint01 EPSG4326TileHelper::CalcZoom ( Bounds< 2, fltp08 > lat_long_bounds_wgs84_dd, Vector< 2, uint04 > size )

static

Calculates the optimal zoom level for a geographic bounds and pixel size.

Parameters

[in]	lat_long_bounds_wgs84_dd	The geographic bounds in WGS84 decimal degrees.
[in]	size	The desired pixel dimensions.

Returns

The optimal zoom level.

DefaultHelper()

EPSG4326TileHelper & EPSG4326TileHelper::DefaultHelper ( )

static

Returns the singleton helper instance.

Returns

A reference to the default EPSG4326TileHelper.

EPSG4326()

fltp08 EPSG4326TileHelper::EPSG4326 ( uint01 dim, fltp08 lon_deg, uint01 z, fltp08 scale_factor = 1.0 )

static

Converts a geographic coordinate to tile space.

Parameters

[in]	dim	The dimension (0 = longitude, 1 = latitude).
[in]	lon_deg	The coordinate in degrees.
[in]	z	The zoom level.
[in]	scale_factor	The scale factor.

Returns

The tile-space coordinate.

tile_x_to_EPSG4326_lon_deg() [1/2]

fltp08 EPSG4326TileHelper::tile_x_to_EPSG4326_lon_deg	(	uint04	x,
		uint04	z,
		fltp08	percent_x,
		fltp08	scale_factor = 1.0 ) const

Converts a tile X coordinate to longitude using a fractional position.

Parameters

[in]	x	The tile X index.
[in]	z	The zoom level.
[in]	percent_x	The fractional position within the tile (0.0 to 1.0).
[in]	scale_factor	The scale factor.

Returns

The longitude in degrees.

tile_x_to_EPSG4326_lon_deg() [2/2]

fltp08 EPSG4326TileHelper::tile_x_to_EPSG4326_lon_deg	(	uint04	x,
		uint04	z,
		TileLocation	location,
		fltp08	scale_factor = 1.0 ) const

Converts a tile X coordinate to longitude in degrees.

Parameters

[in]	x	The tile X index.
[in]	z	The zoom level.
[in]	location	The position within the tile.
[in]	scale_factor	The scale factor.

Returns

The longitude in degrees.

tile_y_to_EPSG4326_lat_deg() [1/2]

fltp08 EPSG4326TileHelper::tile_y_to_EPSG4326_lat_deg	(	uint04	y,
		uint04	z,
		fltp08	percent_y,
		fltp08	scale_factor = 1.0 ) const

Converts a tile Y coordinate to latitude using a fractional position.

Parameters

[in]	y	The tile Y index.
[in]	z	The zoom level.
[in]	percent_y	The fractional position within the tile (0.0 to 1.0).
[in]	scale_factor	The scale factor.

Returns

The latitude in degrees.

tile_y_to_EPSG4326_lat_deg() [2/2]

fltp08 EPSG4326TileHelper::tile_y_to_EPSG4326_lat_deg	(	uint04	y,
		uint04	z,
		TileLocation	location,
		fltp08	scale_factor = 1.0 ) const

Converts a tile Y coordinate to latitude in degrees.

Parameters

[in]	y	The tile Y index.
[in]	z	The zoom level.
[in]	location	The position within the tile.
[in]	scale_factor	The scale factor.

Returns

The latitude in degrees.

TileSpace()

Bounds< 2, fltp08 > EPSG4326TileHelper::TileSpace ( Bounds< 2, fltp08 > lat_long_bounds, Vector< 2, uint04 > size, fltp08 scale_factor = 1.0 )

static

Computes the tile space bounds for a geographic bounding box.

Parameters

[in]	lat_long_bounds	The geographic bounds in degrees.
[in]	size	The desired output size.
[in]	scale_factor	The scale factor.

Returns

The tile-space bounding box.

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The documentation for this class was generated from the following file:

• ArialTileFetcher/Headers/WebMercatorTiledImageManager.h