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
Name | Type | Description |
---|---|---|
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
.
Example:
const google = new Cesium.GoogleEarthEnterpriseMapsProvider({
url : 'https://earth.localdomain',
channel : 1008
});
See:
Members
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. This function should not be called before
GoogleEarthEnterpriseMapsProvider#ready
returns true.
The default alpha blending value of this provider, with 0.0 representing fully transparent and
1.0 representing fully opaque.
-
Default Value:
undefined
The default brightness of this provider. 1.0 uses the unmodified imagery color. Less than 1.0
makes the imagery darker while greater than 1.0 makes it brighter.
-
Default Value:
undefined
The default contrast of this provider. 1.0 uses the unmodified imagery color. Less than 1.0 reduces
the contrast while greater than 1.0 increases it.
-
Default Value:
undefined
The default alpha blending value on the day side of the globe of this provider, with 0.0 representing fully transparent and
1.0 representing fully opaque.
-
Default Value:
undefined
The default gamma correction to apply to this provider. 1.0 uses the unmodified imagery color.
-
Default Value:
1.9
The default hue of this provider in radians. 0.0 uses the unmodified imagery color.
-
Default Value:
undefined
defaultMagnificationFilter : TextureMagnificationFilter
The default texture magnification filter to apply to this provider.
-
Default Value:
undefined
defaultMinificationFilter : TextureMinificationFilter
The default texture minification filter to apply to this provider.
-
Default Value:
undefined
The default alpha blending value on the night side of the globe of this provider, with 0.0 representing fully transparent and
1.0 representing fully opaque.
-
Default Value:
undefined
The default saturation of this provider. 1.0 uses the unmodified imagery color. Less than 1.0 reduces the
saturation while greater than 1.0 increases it.
-
Default Value:
undefined
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. This function should
not be called before
GoogleEarthEnterpriseMapsProvider#ready
returns true.
Gets the minimum level-of-detail that can be requested. This function should
not be called before
GoogleEarthEnterpriseMapsProvider#ready
returns true.
Gets the url path of the data on the Google Earth server.
readonly proxy : Proxy
Gets the proxy used by this provider.
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.
readonly rectangle : Rectangle
Gets the rectangle, in radians, of the imagery provided by this instance. This function should
not be called before
GoogleEarthEnterpriseMapsProvider#ready
returns true.
Gets the type of data that is being requested from the provider. This function should
not be called before
GoogleEarthEnterpriseMapsProvider#ready
returns true.
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. This function should
not be called before
GoogleEarthEnterpriseMapsProvider#ready
returns true.
Gets the height of each tile, in pixels. This function should
not be called before
GoogleEarthEnterpriseMapsProvider#ready
returns true.
Gets the width of each tile, in pixels. This function should
not be called before
GoogleEarthEnterpriseMapsProvider#ready
returns true.
readonly tilingScheme : TilingScheme
Gets the tiling scheme used by this provider. This function should
not be called before
GoogleEarthEnterpriseMapsProvider#ready
returns true.
Gets the URL of the Google Earth MapServer.
Gets the version of the data used by this provider. This function should
not be called before
GoogleEarthEnterpriseMapsProvider#ready
returns true.
Methods
getTileCredits(x, y, level) → Array.<Credit>
Gets the credits to be displayed when a given tile is displayed.
Name | Type | Description |
---|---|---|
x |
Number | The tile X coordinate. |
y |
Number | The tile Y coordinate. |
level |
Number | The tile level; |
Returns:
The credits to be displayed when the tile is displayed.
Throws:
-
DeveloperError :
getTileCredits
must not be called before the imagery provider is ready.
pickFeatures(x, y, level, longitude, latitude) → Promise.<Array.<ImageryLayerFeatureInfo>>|undefined
Picking features is not currently supported by this imagery provider, so this function simply returns
undefined.
Name | Type | Description |
---|---|---|
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. |
Returns:
A promise for the picked features that will resolve when the asynchronous
picking completes. The resolved value is an array of
ImageryLayerFeatureInfo
instances. The array may be empty if no features are found at the given location.
It may also be undefined if picking is not supported.
Requests the image for a given tile. This function should
not be called before
GoogleEarthEnterpriseMapsProvider#ready
returns true.
Name | Type | Description |
---|---|---|
x |
Number | The tile X coordinate. |
y |
Number | The tile Y coordinate. |
level |
Number | The tile level. |
request |
Request | optional The request object. Intended for internal use only. |
Returns:
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. The resolved image may be either an
Image or a Canvas DOM object.
Throws:
-
DeveloperError :
requestImage
must not be called before the imagery provider is ready.
Type Definitions
Initialization options for the GoogleEarthEnterpriseMapsProvider constructor
Properties:
Name | Type | Attributes | Default | Description |
---|---|---|---|---|
url |
Resource | String | The url of the Google Earth server hosting the imagery. | ||
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 |
<optional> |
"/default_map" | The path of the Google Earth server hosting the imagery. |
maximumLevel |
Number |
<optional> |
The maximum level-of-detail supported by the Google Earth Enterprise server, or undefined if there is no limit. | |
tileDiscardPolicy |
TileDiscardPolicy |
<optional> |
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 |
<optional> |
The ellipsoid. If not specified, the WGS84 ellipsoid is used. |