To construct a GoogleEarthEnterpriseMapsProvider, call
Provides tiled imagery using the Google Earth Imagery API.
Notes: This imagery provider does not work with the public Google Earth servers. It works with the
Google Earth Enterprise Server.
By default the Google Earth Enterprise server does not set the
Cross-Origin Resource Sharing headers. You can either
use a proxy server which adds these headers, or in the /opt/google/gehttpd/conf/gehttpd.conf
and add the 'Header set Access-Control-Allow-Origin "*"' option to the '<Directory />' and
'<Directory "/opt/google/gehttpd/htdocs">' directives.
This provider is for use with 2D Maps API as part of Google Earth Enterprise. For 3D Earth API uses, it
is necessary to use GoogleEarthEnterpriseImageryProvider.fromUrl. Do not call the constructor directly.
GoogleEarthEnterpriseImageryProvider
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
options |
GoogleEarthEnterpriseMapsProvider.ConstructorOptions | Object describing initialization options |
Throws:
-
RuntimeError : Could not find layer with channel (id) of
options.channel. -
RuntimeError : Could not find a version in channel (id)
options.channel. -
RuntimeError : Unsupported projection
data.projection.
使用示例:
const google = await Cesium.GoogleEarthEnterpriseMapsProvider.fromUrl("https://earth.localdomain", 1008);参考:
成员(属性)
Gets or sets the URL to the Google Earth logo for display in the credit.
Gets the imagery channel (id) currently being used.
readonly credit : Credit
Gets the credit to display when this imagery provider is active. Typically this is used to credit
the source of the imagery.
readonly errorEvent : Event
Gets an event that is raised when the imagery 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 images provided by this imagery provider
include an alpha channel. If this property is false, an alpha channel, if present, will
be ignored. If this property is true, any images without an alpha channel will be treated
as if their alpha is 1.0 everywhere. When this property is false, memory usage
and texture upload time are reduced.
Gets the maximum level-of-detail that can be requested.
Gets the minimum level-of-detail that can be requested.
Gets the url path of the data on the Google Earth server.
readonly proxy : Proxy
Gets the proxy used by this provider.
readonly rectangle : Rectangle
Gets the rectangle, in radians, of the imagery provided by this instance.
Gets the type of data that is being requested from the provider.
readonly tileDiscardPolicy : TileDiscardPolicy
Gets the tile discard policy. If not undefined, the discard policy is responsible
for filtering out "missing" tiles via its shouldDiscardImage function. If this function
returns undefined, no tiles are filtered.
Gets the height of each tile, in pixels.
Gets the width of each tile, in pixels.
readonly tilingScheme : TilingScheme
Gets the tiling scheme used by this provider.
Gets the URL of the Google Earth MapServer.
Gets the version of the data used by this provider.
方法
static Cesium.GoogleEarthEnterpriseMapsProvider.fromUrl(url, options) → Promise.<GoogleEarthEnterpriseMapsProvider>
Creates a tiled imagery provider using the Google Earth Imagery API.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
url |
Resource | String | The url of the Google Earth server hosting the imagery. |
options |
GoogleEarthEnterpriseMapsProvider.ConstructorOptions | 可选 Object describing initialization options |
返回值:
The created GoogleEarthEnterpriseMapsProvider.
Throws:
-
RuntimeError : Could not find layer with channel (id) of
options.channel. -
RuntimeError : Could not find a version in channel (id)
options.channel. -
RuntimeError : Unsupported projection
data.projection.
使用示例:
const google = await Cesium.GoogleEarthEnterpriseMapsProvider.fromUrl("https://earth.localdomain", 1008);getTileCredits(x, y, level) → Array.<Credit>
Gets the credits to be displayed when a given tile is displayed.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
x |
number | The tile X coordinate. |
y |
number | The tile Y coordinate. |
level |
number | The tile level; |
返回值:
The credits to be displayed when the tile is displayed.
Picking features is not currently supported by this imagery provider, so this function simply returns
undefined.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
x |
number | The tile X coordinate. |
y |
number | The tile Y coordinate. |
level |
number | The tile level. |
longitude |
number | The longitude at which to pick features. |
latitude |
number | The latitude at which to pick features. |
返回值:
Undefined since picking is not supported.
requestImage(x, y, level, request) → Promise.<ImageryTypes>|undefined
Requests the image for a given tile.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
x |
number | The tile X coordinate. |
y |
number | The tile Y coordinate. |
level |
number | The tile level. |
request |
Request | 可选 The request object. Intended for internal use only. |
返回值:
A promise for the image that will resolve when the image is available, or
undefined if there are too many active requests to the server, and the request should be retried later.
定义的类型
Initialization options for the GoogleEarthEnterpriseMapsProvider constructor
属性:
| 属性名称 | 类型 | 可选 | 默认值 | 描述信息 |
|---|---|---|---|---|
channel |
number | The channel (id) to be used when requesting data from the server. The channel number can be found by looking at the json file located at: earth.localdomain/default_map/query?request=Json&vars=geeServerDefs The /default_map path may differ depending on your Google Earth Enterprise server configuration. Look for the "id" that is associated with a "ImageryMaps" requestType. There may be more than one id available. Example: { layers: [ { id: 1002, requestType: "ImageryMaps" }, { id: 1007, requestType: "VectorMapsRaster" } ] } | ||
path |
string |
<可选> |
"/default_map" | The path of the Google Earth server hosting the imagery. |
maximumLevel |
number |
<可选> |
The maximum level-of-detail supported by the Google Earth Enterprise server, or undefined if there is no limit. | |
tileDiscardPolicy |
TileDiscardPolicy |
<可选> |
The policy that determines if a tile
is invalid and should be discarded. To ensure that no tiles are discarded, construct and pass
a NeverTileDiscardPolicy for this parameter. |
|
ellipsoid |
Ellipsoid |
<可选> |
Ellipsoid.default | The ellipsoid. If not specified, the default ellipsoid is used. |