Terrain data for a single tile. This type describes an
interface and is not intended to be instantiated directly.
Members
credits : Array.<Credit>
An array of credits for this tile.
The water mask included in this terrain data, if any. A water mask is a rectangular
Uint8Array or image where a value of 255 indicates water and a value of 0 indicates land.
Values in between 0 and 255 are allowed as well to smoothly blend between land and water.
Methods
Computes the terrain height at a specified longitude and latitude.
| Name | Type | Description |
|---|---|---|
rectangle |
Rectangle | The rectangle covered by this terrain data. |
longitude |
number | The longitude in radians. |
latitude |
number | The latitude in radians. |
Returns:
The terrain height at the specified position. If the position
is outside the rectangle, this method will extrapolate the height, which is likely to be wildly
incorrect for positions far outside the rectangle.
Determines if a given child tile is available, based on the
TerrainData#childTileMask. The given child tile coordinates are assumed
to be one of the four children of this tile. If non-child tile coordinates are
given, the availability of the southeast child tile is returned.
| Name | Type | Description |
|---|---|---|
thisX |
number | The tile X coordinate of this (the parent) tile. |
thisY |
number | The tile Y coordinate of this (the parent) tile. |
childX |
number | The tile X coordinate of the child tile to check for availability. |
childY |
number | The tile Y coordinate of the child tile to check for availability. |
Returns:
True if the child tile is available; otherwise, false.
upsample(tilingScheme, thisX, thisY, thisLevel, descendantX, descendantY, descendantLevel) → Promise.<TerrainData>|undefined
Upsamples this terrain data for use by a descendant tile.
| Name | Type | Description |
|---|---|---|
tilingScheme |
TilingScheme | The tiling scheme of this terrain data. |
thisX |
number | The X coordinate of this tile in the tiling scheme. |
thisY |
number | The Y coordinate of this tile in the tiling scheme. |
thisLevel |
number | The level of this tile in the tiling scheme. |
descendantX |
number | The X coordinate within the tiling scheme of the descendant tile for which we are upsampling. |
descendantY |
number | The Y coordinate within the tiling scheme of the descendant tile for which we are upsampling. |
descendantLevel |
number | The level within the tiling scheme of the descendant tile for which we are upsampling. |
Returns:
A promise for upsampled terrain data for the descendant tile,
or undefined if too many asynchronous upsample operations are in progress and the request has been
deferred.
Gets a value indicating whether or not this terrain data was created by upsampling lower resolution
terrain data. If this value is false, the data was obtained from some other source, such
as by downloading it from a remote server. This method should return true for instances
returned from a call to
TerrainData#upsample.
Returns:
True if this instance was created by upsampling; otherwise, false.