Class: TilingScheme

TilingScheme

new TilingScheme()

A tiling scheme for geometry or imagery on the surface of an ellipsoid. At level-of-detail zero, the coarsest, least-detailed level, the number of tiles is configurable. At level of detail one, each of the level zero tiles has four children, two in each direction. At level of detail two, each of the level one tiles has four children, two in each direction. This continues for as many levels as are present in the geometry or imagery source.
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Members

ellipsoid :Ellipsoid

Gets the ellipsoid that is tiled by the tiling scheme.
Type:
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projection :MapProjection

Gets the map projection used by the tiling scheme.
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rectangle :Rectangle

Gets the rectangle, in radians, covered by this tiling scheme.
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Methods

getNumberOfXTilesAtLevel(level) → {Number}

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

getNumberOfYTilesAtLevel(level) → {Number}

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

positionToTileXY(position, level, resultopt) → {Cartesian2}

Calculates the tile x, y coordinates of the tile containing a given cartographic position.
Parameters:
Name Type Attributes Description
position Cartographic The position.
level Number The tile level-of-detail. Zero is the least detailed.
result Cartesian2 <optional>
 The instance to which to copy the result, or undefined if a new instance should be created.
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Returns:
The specified 'result', or a new object containing the tile x, y coordinates if 'result' is undefined.
Type
Cartesian2

rectangleToNativeRectangle(rectangle, resultopt) → {Rectangle}

Transforms an rectangle specified in geodetic radians to the native coordinate system of this tiling scheme.
Parameters:
Name Type Attributes 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.
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Returns:
The specified 'result', or a new object containing the native rectangle if 'result' is undefined.
Type
Rectangle

tileXYToNativeRectangle(x, y, level, resultopt) → {Rectangle}

Converts tile x, y coordinates and level to an rectangle expressed in the native coordinates of the tiling scheme.
Parameters:
Name Type Attributes 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.
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Returns:
The specified 'result', or a new object containing the rectangle if 'result' is undefined.
Type
Rectangle

tileXYToRectangle(x, y, level, resultopt) → {Rectangle}

Converts tile x, y coordinates and level to a cartographic rectangle in radians.
Parameters:
Name Type Attributes 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.
Source:
Returns:
The specified 'result', or a new object containing the rectangle if 'result' is undefined.
Type
Rectangle