WebMercatorTilingScheme

new WebMercatorTilingScheme

A tiling scheme for geometry referenced to a WebMercatorProjection, EPSG:3857. This is the tiling scheme used by Google Maps, Microsoft Bing Maps, and most of ESRI ArcGIS Online.

Parameters:

Name	Type	Argument	Default	Description
`description.ellipsoid`	Ellipsoid	<optional>	Ellipsoid.WGS84	The ellipsoid whose surface is being tiled. Defaults to the WGS84 ellipsoid.
`description.numberOfLevelZeroTilesX`	Number	<optional>	1	The number of tiles in the X direction at level zero of the tile tree.
`description.numberOfLevelZeroTilesY`	Number	<optional>	1	The number of tiles in the Y direction at level zero of the tile tree.
`description.extentSouthwestInMeters`	Cartesian2	<optional>		The southwest corner of the extent covered by the tiling scheme, in meters. If this parameter or extentNortheastInMeters is not specified, the entire globe is covered in the longitude direction and an equal distance is covered in the latitude direction, resulting in a square projection.
`description.extentNortheastInMeters`	Cartesian2	<optional>		The northeast corner of the extent covered by the tiling scheme, in meters. If this parameter or extentSouthwestInMeters is not specified, the entire globe is covered in the longitude direction and an equal distance is covered in the latitude direction, resulting in a square projection.

Source:

/Source/Scene/WebMercatorTilingScheme.js

Methods

createLevelZeroTiles

Creates the tile or tiles at level of detail zero, the coarsest, least detailed level.

Returns:

Array An array containing the tiles at level of detail zero, starting with the tile in the northwest corner of the globe and followed by the tile (if any) to its east.

extentToNativeExtent

Transforms an extent specified in geodetic radians to the native coordinate system of this tiling scheme.

Parameters:

Name	Type	Argument	Description
`extent`	Extent		The extent to transform.
`result`	Extent	<optional>	The instance to which to copy the result, or undefined if a new instance should be created.

Returns:

Extent The specified 'result', or a new object containing the native extent if 'result' is undefined.

getEllipsoid

Gets the ellipsoid that is tiled by this tiling scheme.

Returns:

Ellipsoid The ellipsoid.

getExtent

Gets the extent, in radians, covered by this tiling scheme.

Returns:

Extent The extent.

getNumberOfXTilesAtLevel

Gets the total number of tiles in the X direction at a specified level-of-detail.

Parameters:

Name	Type	Description
`level`	Number	The level-of-detail.

Returns:

Number The number of tiles in the X direction at the given level.

getNumberOfYTilesAtLevel

Gets the total number of tiles in the Y direction at a specified level-of-detail.

Parameters:

Name	Type	Description
`level`	Number	The level-of-detail.

Returns:

Number The number of tiles in the Y direction at the given level.

getProjection

Gets the map projection used by this tiling scheme.

Returns:

Projection The map projection.

tileXYToNativeExtent

Converts tile x, y coordinates and level to an extent expressed in the native coordinates of the tiling scheme.

Parameters:

Name	Type	Argument	Description
`x`	Number		The integer x coordinate of the tile.
`y`	Number		The integer y coordinate of the tile.
`level`	Number		The tile level-of-detail. Zero is the least detailed.
`result`	Object	<optional>	The instance to which to copy the result, or undefined if a new instance should be created.

Returns:

Extent The specified 'result', or a new object containing the extent if 'result' is undefined.