A TerrainProvider that accesses terrain data in a Cesium terrain format.
参数描述:
| 名称 |
类型 |
描述 |
options |
Object
|
Object with the following properties:
| 名称 |
类型 |
默认值 |
描述 |
url |
Resource
|
String
|
Promise.<Resource>
|
Promise.<String>
|
|
The URL of the Cesium terrain server. |
requestVertexNormals |
Boolean
|
false
|
可选
Flag that indicates if the client should request additional lighting information from the server, in the form of per vertex normals if available. |
requestWaterMask |
Boolean
|
false
|
可选
Flag that indicates if the client should request per tile water masks from the server, if available. |
requestMetadata |
Boolean
|
true
|
可选
Flag that indicates if the client should request per tile metadata from the server, if available. |
ellipsoid |
Ellipsoid
|
|
可选
The ellipsoid. If not specified, the WGS84 ellipsoid is used. |
credit |
Credit
|
String
|
|
可选
A credit for the data source, which is displayed on the canvas. |
|
- Author:
-
属性
Gets an object that can be used to determine availability of terrain from this provider, such as
at points and in rectangles. This function should not be called before
VectorCesiumTerrainProvider#ready returns true. This property may be undefined if availability
information is not available. Note that this reflects tiles that are known to be available currently.
Additional tiles may be discovered to be available in the future, e.g. if availability information
exists deeper in the tree rather than it all being discoverable at the root. However, a tile that
is available now will not become unavailable in the future.
Gets the credit to display when this terrain provider is active. Typically this is used to credit
the source of the terrain. This function should not be called before VectorCesiumTerrainProvider#ready returns true.
Gets an event that is raised when the terrain provider encounters an asynchronous error. By subscribing
to the event, you will be notified of the error and can potentially recover from it. Event listeners
are passed an instance of TileProviderError.
Gets a value indicating whether or not the requested tiles include metadata.
This function should not be called before VectorCesiumTerrainProvider#ready returns true.
Gets a value indicating whether or not the requested tiles include vertex normals.
This function should not be called before VectorCesiumTerrainProvider#ready returns true.
Gets a value indicating whether or not the provider includes a water mask. The water mask
indicates which areas of the globe are water rather than land, so they can be rendered
as a reflective surface with animated waves. This function should not be
called before VectorCesiumTerrainProvider#ready returns true.
Gets a value indicating whether or not the provider is ready for use.
Gets a promise that resolves to true when the provider is ready for use.
Boolean flag that indicates if the client should request metadata from the server.
Metadata is appended to the standard tile mesh data only if the client requests the metadata and
if the server provides a metadata.
Boolean flag that indicates if the client should request vertex normals from the server.
Vertex normals data is appended to the standard tile mesh data only if the client requests the vertex normals and
if the server provides vertex normals.
Boolean flag that indicates if the client should request a watermask from the server.
Watermask data is appended to the standard tile mesh data only if the client requests the watermask and
if the server provides a watermask.
方法
Gets the maximum geometric error allowed in a tile at a given level.
参数描述:
| 名称 |
类型 |
描述 |
level |
Number
|
The tile level for which to get the maximum geometric error. |
返回:
The maximum geometric error.
Determines whether data for a tile is available to be loaded.
参数描述:
| 名称 |
类型 |
描述 |
x |
Number
|
The X coordinate of the tile for which to request geometry. |
y |
Number
|
The Y coordinate of the tile for which to request geometry. |
level |
Number
|
The level of the tile for which to request geometry. |
返回:
Undefined if not supported or availability is unknown, otherwise true or false.
Makes sure we load availability data for a tile
参数描述:
| 名称 |
类型 |
描述 |
x |
Number
|
The X coordinate of the tile for which to request geometry. |
y |
Number
|
The Y coordinate of the tile for which to request geometry. |
level |
Number
|
The level of the tile for which to request geometry. |
返回:
Undefined if nothing need to be loaded or a Promise that resolves when all required tiles are loaded
Requests the geometry for a given tile. This function should not be called before
VectorCesiumTerrainProvider#ready returns true. The result must include terrain data and
may optionally include a water mask and an indication of which child tiles are available.
参数描述:
| 名称 |
类型 |
描述 |
x |
Number
|
The X coordinate of the tile for which to request geometry. |
y |
Number
|
The Y coordinate of the tile for which to request geometry. |
level |
Number
|
The level of the tile for which to request geometry. |
request |
Request
|
可选
The request object. Intended for internal use only. |
返回:
A promise for the requested geometry. If this method
returns undefined instead of a promise, it is an indication that too many requests are already
pending and the request will be retried later.
Throws:
