options |
Object
|
optional
Object with the following properties:
| Name |
Type |
Default |
Description |
rectangle |
Rectangle
|
imageryProvider.rectangle
|
optional
The rectangle of the layer. This rectangle
can limit the visible portion of the imagery provider. |
alpha |
Number
|
function
|
1.0
|
optional
The alpha blending value of this layer, from 0.0 to 1.0.
This can either be a simple number or a function with the signature
function(frameState, layer, x, y, level). The function is passed the
current frame state, this layer, and the x, y, and level coordinates of the
imagery tile for which the alpha is required, and it is expected to return
the alpha value to use for the tile. |
brightness |
Number
|
function
|
1.0
|
optional
The brightness of this layer. 1.0 uses the unmodified imagery
color. Less than 1.0 makes the imagery darker while greater than 1.0 makes it brighter.
This can either be a simple number or a function with the signature
function(frameState, layer, x, y, level). The function is passed the
current frame state, this layer, and the x, y, and level coordinates of the
imagery tile for which the brightness is required, and it is expected to return
the brightness value to use for the tile. The function is executed for every
frame and for every tile, so it must be fast. |
contrast |
Number
|
function
|
1.0
|
optional
The contrast of this layer. 1.0 uses the unmodified imagery color.
Less than 1.0 reduces the contrast while greater than 1.0 increases it.
This can either be a simple number or a function with the signature
function(frameState, layer, x, y, level). The function is passed the
current frame state, this layer, and the x, y, and level coordinates of the
imagery tile for which the contrast is required, and it is expected to return
the contrast value to use for the tile. The function is executed for every
frame and for every tile, so it must be fast. |
hue |
Number
|
function
|
0.0
|
optional
The hue of this layer. 0.0 uses the unmodified imagery color.
This can either be a simple number or a function with the signature
function(frameState, layer, x, y, level). The function is passed the
current frame state, this layer, and the x, y, and level coordinates
of the imagery tile for which the hue is required, and it is expected to return
the contrast value to use for the tile. The function is executed for every
frame and for every tile, so it must be fast. |
saturation |
Number
|
function
|
1.0
|
optional
The saturation of this layer. 1.0 uses the unmodified imagery color.
Less than 1.0 reduces the saturation while greater than 1.0 increases it.
This can either be a simple number or a function with the signature
function(frameState, layer, x, y, level). The function is passed the
current frame state, this layer, and the x, y, and level coordinates
of the imagery tile for which the saturation is required, and it is expected to return
the contrast value to use for the tile. The function is executed for every
frame and for every tile, so it must be fast. |
gamma |
Number
|
function
|
1.0
|
optional
The gamma correction to apply to this layer. 1.0 uses the unmodified imagery color.
This can either be a simple number or a function with the signature
function(frameState, layer, x, y, level). The function is passed the
current frame state, this layer, and the x, y, and level coordinates of the
imagery tile for which the gamma is required, and it is expected to return
the gamma value to use for the tile. The function is executed for every
frame and for every tile, so it must be fast. |
show |
Boolean
|
true
|
optional
True if the layer is shown; otherwise, false. |
maximumAnisotropy |
Number
|
maximum supported
|
optional
The maximum anisotropy level to use
for texture filtering. If this parameter is not specified, the maximum anisotropy supported
by the WebGL stack will be used. Larger values make the imagery look better in horizon
views. |
minimumTerrainLevel |
Number
|
|
optional
The minimum terrain level-of-detail at which to show this imagery layer,
or undefined to show it at all levels. Level zero is the least-detailed level. |
maximumTerrainLevel |
Number
|
|
optional
The maximum terrain level-of-detail at which to show this imagery layer,
or undefined to show it at all levels. Level zero is the least-detailed level. |
|
