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:
|
Members
Gets the ellipsoid that is tiled by this tiling scheme.
Gets the map projection used by this tiling scheme.
Gets the rectangle, in radians, covered by this tiling scheme.
Methods
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.
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.
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 |
Cartesian2 | 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.
rectangleToNativeRectangle(rectangle, result) → Rectangle
Transforms a 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.
tileXYToNativeRectangle(x, y, level, result) → Rectangle
Converts tile x, y coordinates and level to a 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.
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.