WebMercatorTilingScheme

new WebMercatorTilingScheme(options)

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.
Name Type Description
options Object optional Object with the following properties:
Name Type Default Description
ellipsoid Ellipsoid Ellipsoid.WGS84 optional The ellipsoid whose surface is being tiled. Defaults to the WGS84 ellipsoid.
numberOfLevelZeroTilesX Number 1 optional The number of tiles in the X direction at level zero of the tile tree.
numberOfLevelZeroTilesY Number 1 optional The number of tiles in the Y direction at level zero of the tile tree.
rectangleSouthwestInMeters Cartesian2 optional The southwest corner of the rectangle covered by the tiling scheme, in meters. If this parameter or rectangleNortheastInMeters 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.
rectangleNortheastInMeters Cartesian2 optional The northeast corner of the rectangle covered by the tiling scheme, in meters. If this parameter or rectangleSouthwestInMeters 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: Core/WebMercatorTilingScheme.js, line 43

Members

ellipsoid :Ellipsoid

Gets the ellipsoid that is tiled by this tiling scheme.
Source: Core/WebMercatorTilingScheme.js, line 74

projection :Projection

Gets the map projection used by this tiling scheme.
Source: Core/WebMercatorTilingScheme.js, line 96

rectangle :Rectangle

Gets the rectangle, in radians, covered by this tiling scheme.
Source: Core/WebMercatorTilingScheme.js, line 85

Methods

getNumberOfXTilesAtLevel(level) → Number

Gets the total number of tiles in the X direction at a specified level-of-detail.
Name Type Description
level Number The level-of-detail.
Returns:
The number of tiles in the X direction at the given level.
Source: Core/WebMercatorTilingScheme.js, line 109

getNumberOfYTilesAtLevel(level) → Number

Gets the total number of tiles in the Y direction at a specified level-of-detail.
Name Type Description
level Number The level-of-detail.
Returns:
The number of tiles in the Y direction at the given level.
Source: Core/WebMercatorTilingScheme.js, line 119

positionToTileXY(position, level, result) → Cartesian2

Calculates the tile x, y coordinates of the tile containing a given cartographic position.
Name Type Description
position Cartographic The position.
level Number The tile level-of-detail. Zero is the least detailed.
result Cartesian optional The instance to which to copy the result, or undefined if a new instance should be created.
Returns:
The specified 'result', or a new object containing the tile x, y coordinates if 'result' is undefined.
Source: Core/WebMercatorTilingScheme.js, line 220

rectangleToNativeRectangle(rectangle, result) → Rectangle

Transforms an rectangle specified in geodetic radians to the native coordinate system of this tiling scheme.
Name Type Description
rectangle Rectangle The rectangle to transform.
result Rectangle optional The instance to which to copy the result, or undefined if a new instance should be created.
Returns:
The specified 'result', or a new object containing the native rectangle if 'result' is undefined.
Source: Core/WebMercatorTilingScheme.js, line 133

tileXYToNativeRectangle(x, y, level, result) → Rectangle

Converts tile x, y coordinates and level to an rectangle expressed in the native coordinates of the tiling scheme.
Name Type 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:
The specified 'result', or a new object containing the rectangle if 'result' is undefined.
Source: Core/WebMercatorTilingScheme.js, line 161

tileXYToRectangle(x, y, level, result) → Rectangle

Converts tile x, y coordinates and level to a cartographic rectangle in radians.
Name Type 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:
The specified 'result', or a new object containing the rectangle if 'result' is undefined.
Source: Core/WebMercatorTilingScheme.js, line 195