WebMercatorTilingScheme

WebMercatorTilingScheme

new

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:

Members

:Ellipsoid

Gets the ellipsoid that is tiled by this tiling scheme.

:Extent

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

:Projection

Gets the map projection used by this tiling scheme.

Methods

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.

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.

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.

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.

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.