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GeographicTilingScheme

GeographicTilingScheme

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A tiling scheme for geometry referenced to a simple GeographicProjection where longitude and latitude are directly mapped to X and Y. This projection is commonly known as geographic, equirectangular, equidistant cylindrical, or plate carrée.

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.extent Extent <optional>
 Extent.MAX_VALUE The extent, in radians, covered by the tiling scheme.
description.numberOfLevelZeroTilesX Number <optional>
 2 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.
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.

Calculates the tile x, y coordinates of the tile containing a given cartographic position.

Parameters:
Name Type Argument 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:
Cartesian2 The specified 'result', or a new object containing the tile x, y coordinates if 'result' is undefined.

Converts tile x, y coordinates and level to a cartographic extent in radians.

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.

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.

<static>

Calculates the tile x, y coordinates of the tile containing a given cartographic position.

Parameters:
Name Type Argument 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:
Cartesian2 The specified 'result', or a new object containing the tile x, y coordinates if 'result' is undefined.

<static>

Converts tile x, y coordinates and level to a cartographic extent in radians.

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.