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Class: RasterLayer
[ AMD Module Require | Legacy Module Require ]
require(["esri/layers/RasterLayer"], function(RasterLayer) { /* code goes here */ });
Description
(Added at v3.13)
The RasterLayer is used to display image services. It retrieves data from image services and applies client side pixel filtering (e.g., mask, stretch). This layer is particularly useful when you need to interactively change pixel manipulation criteria and get an immediate response.Known limitations:
- Only works on the latest versions of major browsers that support Canvas and typed arrays.
Samples
Search for samples that use this class.Class hierarchy
esri/layers/Layer |_esri/layers/RasterLayer
Constructors
| Name | Summary |
|---|---|
| new RasterLayer(url, options?) | Creates a new RasterLayer object. |
Properties
| Name | Type | Summary |
|---|---|---|
| attributionDataUrl | String | The URL, when available, where the layer's attribution data is stored. |
| className | String | class attribute of the layer's node. |
| credential | Credential | Provides credential information for the layer such as userid and token if the layer represents a resource that is secured with token-based authentication. |
| hasAttributionData | Boolean | When true, the layer has attribution data. |
| id | String | ID assigned to the layer. |
| loadError | Error | Set if the layer failed to load. |
| loaded | Boolean | When the layer is loaded, the value becomes "true", and layer properties can be accessed. |
| maxScale | Number | Maximum visible scale for the layer. |
| minScale | Number | Minimum visible scale for the layer. |
| opacity | Number | Opacity or transparency of layer. |
| pixelFilter | Function | A function that takes a pixelData object as input and processes it. |
| refreshInterval | Number | Refresh interval of the layer in minutes. |
| showAttribution | Boolean | When true, the layer's attribution is displayed on the map. |
| suspended | Boolean | When true, the layer is suspended. |
| url | String | URL to the ArcGIS Server REST resource that represents a map service. |
| visible | Boolean | Visibility of the layer. |
| visibleAtMapScale | Boolean | When true, the layer is visible at the current map scale. |
Methods
| Name | Return type | Summary |
|---|---|---|
| attr(name, value) | Layer | Adds a new attribute or changes the value of an existing attribute on the layer's node. |
| getAttributionData() | Deferred | Asynchrously returns custom data for the layer when available. |
| getContext() | Object | Returns the context of the Canvas. |
| getMap() | Map | Returns reference to the map control the layer is added to. |
| getNode() | HTMLElement | Returns the layer's DOM node. |
| hide() | None | Sets the visibility of the layer to "false". |
| isVisibleAtScale(scale) | Boolean | Returns true if the layer is visible at the given scale. |
| resume() | None | Resumes layer drawing. |
| setImageFormat(imageFormat, doNotRefresh?) | None | Sets the image format. |
| setMaxScale(scale) | None | Set the maximum scale for the layer. |
| setMinScale(scale) | None | Set the minimum scale for the layer. |
| setOpacity(opacity) | None | Sets the opacity of the layer. |
| setPixelFilter(pixelFilter) | None | Sets a pixelFilter on the layer. |
| setRefreshInterval(interval) | Layer | Changes the layer's refresh interval to the given value (in minutes). |
| setScaleRange(minScale, maxScale) | None | Set the scale range for the layer. |
| setUseMapTime(use, doNotRefresh?) | None | Determines if the layer will update its content based on the map's current time extent. |
| setVisibility(isVisible) | None | Sets the visibility of the layer. |
| show() | None | Sets the visibility of the layer to "true". |
| suspend() | None | Suspends layer drawing. |
Events
[ On Style Events | Connect Style Event ]
All On Style event listeners receive a single event object. Additionally, the event object also contains a 'target' property whose value is the object which fired the event.
Events
| Name | Event Object | Summary |
|---|---|---|
| error | {
error: < | Fires when there is a problem retrieving a layer. |
| load | {
layer: < | Fires after layer properties for the layer are successfully populated. |
| opacity-change | {
opacity: < | Fires when the layer opacity has been changed, and returns an object with the opacity value. |
| refresh-interval-change | This event is fired when the layer's refreshInterval is modified. | |
| resume | Fires when a layer resumes drawing. | |
| scale-range-change | Fires when a layer's minScale and/or maxScale is changed. | |
| scale-visibility-change | Fires when a layer's scale visibility changes. | |
| suspend | Fires when a layer suspends drawing. | |
| update | Fires any time a layer has finished loading or updating itself. | |
| update-end | {
error: < | Fires when a layer has finished updating its content. |
| update-start | Fires when a layer begins to update its content. | |
| visibility-change | {
visible: < | Fires when the layer visibility has been changed, and returns an object with a Boolean visible property containing the new visibility value of the layer. |
Constructor Details
Creates a new RasterLayer object.
Parameters:
< |
Required | URL to the ArcGIS Server REST resource that represents a raster layer service. For more information on constructing a URL, see The Services Directory and the REST API. |
< |
Optional | Optional parameters. See options list below. |
options properties: < |
Optional | Sets the layer's draw mode. Set to false if using drawType: "webgl" since pixels are rendered by webgl shaders instead of this layer. |
< |
Optional | Sets the context of the Canvas. Known values: "2d" | "webgl" | "experimental-webgl" | "webgl2" | "experimental-webgl2" |
< |
Optional | Additional parameters defined in an ImageServiceParameters object. |
< |
Optional | Applies a function for visualization or post-processing purposes. |
Sample:
var isRasterLayer = new RasterLayer(isUrl, {
opacity: 1,
pixelFilter: pixelFilter.hillshade, //Class that draws hillshades using a frequent-shader
drawMode: false,
drawType: "experimental-webgl"
});
Property Details
<String
StringThe URL, when available, where the layer's attribution data is stored. (Added at v3.1)
<Credential
CredentialProvides credential information for the layer such as userid and token if the layer represents a resource that is secured with token-based authentication. This value is available after the layer has been loaded i.e.
layer.loaded is true. (Added at v2.5)<Boolean
BooleanWhen true, the layer has attribution data. Use the getAttributionData method to retrieve this data as JSON. (Added at v3.1)
Known values:
true | falseDefault value:
false<String
StringID assigned to the layer. If not assigned, esri.Map assigns value. By default, the ID of the layer is "layer" followed by a number. The ID can be user defined only in the layer constructor.
Sample:
- Setting the layer ID in the layer constructor.
require([ "esri/layers/ArcGISDynamicMapServiceLayer", ... ], function(ArcGISDynamicMapServiceLayer, ... ) { var population = new ArcGISDynamicMapServiceLayer("http://myserver/arcgis/rest/population/MapServer/Layers", {id:"population"}); ... }); - Setting the layer ID after a layer is initialized.
population.id = "population";
- Retrieving the layer ID.
function getMapLayers() { for (var j=0, jl=map.layerIds.length; j<jl; j++) { var currentLayer = map.getLayer(map.layerIds[j]); alert("id: " + currentLayer.id); } }
<Error
ErrorSet if the layer failed to load. (Added at v3.9)
<Boolean
BooleanWhen the layer is loaded, the value becomes "true", and layer properties can be accessed. The onLoad event is also fired.
Known values:
true | false<Number
NumberMaximum visible scale for the layer. If the map is zoomed in beyond this scale, the layer will not be visible. A value of 0 means the layer does not have a maximum scale. (Added at v3.1)
Default value:
0<Number
NumberMinimum visible scale for the layer. If the map is zoomed out beyond this scale, the layer will not be visible. A value of 0 means the layer does not have a visible scale. (Added at v3.1)
Default value:
0<Number
NumberOpacity or transparency of layer. Values range from 0.0 to 1.0, where 0.0 is 100% transparent and 1.0 has no transparency.
Known values:
0.0 - 1.0Default value:
1.0<Function
FunctionA function that takes a pixelData object as input and processes it. The pixelData object contains a pixelBlock property that gives you access to all of the pixels in the raster.
Inside the pixelFilter, you may loop through pixels through the pixelBlock property of the pixelData object and process them. See the RasterLayer sample for an example of how to apply a pixelFilter to a RasterLayer.
(Added at v3.15)<Number
NumberRefresh interval of the layer in minutes. Non-zero value indicates automatic layer refresh at the specified interval. Value of 0 indicates auto refresh is not enabled. (Added at v3.7)
<Boolean
BooleanWhen true, the layer's attribution is displayed on the map. (Added at v3.1)
Known values:
true | falseDefault value:
true<Boolean
BooleanWhen true, the layer is suspended. A layer is considered to be suspended when one of the following is true:
- The layer is hidden.
- The layer is not visible at the current map scale.
- The layer is explicitly suspended by calling the
Layer.suspendmethod.
Known values:
true | false<String
StringURL to the ArcGIS Server REST resource that represents a map service. To obtain the URL, use Services Directory. An example URL for the Street Map service on ArcGIS Online is:
http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer. (Added at v1.2)
http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer. (Added at v1.2)
<Boolean
BooleanWhen true, the layer is visible at the current map scale. (Added at v3.1)
Known values:
true | falseMethod Details
Adds a new attribute or changes the value of an existing attribute on the layer's node. Removes the attribute if the value is
null or undefined. (Added at v3.7)Return type:
LayerAsynchrously returns custom data for the layer when available. (Added at v3.1)
Return type:
DeferredReturns the context of the Canvas. Known values are
CanvasRenderingContext2D | WebGLRenderingContext | WebGL2RenderingContext Return type:
ObjectReturns reference to the map control the layer is added to. Returns
null or undefined if it is not added to a map. (Added at v3.7)Return type:
MapSets the visibility of the layer to "false". The layer is not removed, but it is hidden from view.
Returns true if the layer is visible at the given scale. (Added at v3.1)
Return type:
BooleanParameters:
< |
Required | The scale at which to check if the layer is visible. |
Sets the image format. In general, use
lerc format when needing to use a pixel filter on the raster layer; otherwise use jpeg. Pixel filter may be performed on a jpeg image if the image service is 8 bit and uses lossy compressed data. (Added at v3.14)Set the maximum scale for the layer. (Added at v3.1)
Parameters:
< |
Required | The maximum scale at which the layer is visible. |
Set the minimum scale for the layer. (Added at v3.1)
Parameters:
< |
Required | The minimum scale at which the layer is visible. |
Sets the opacity of the layer. Values range from 0.0 to 1.0, where 0.0 is 100% transparent and 1.0 has no transparency.
Parameters:
< |
Required | Value from 0 to 1, where 0 is 100% transparent and 1 has no transparency. The default value is 1. |
Sample:
layer.setOpacity(0.5);
Sets a pixelFilter on the layer. A pixel filter is a function that takes a pixelData object as input and processes it. The pixelData object contains a pixelBlock property that gives you access to all of the pixels in the raster.
Inside the pixelFilter, you may loop through pixels through the pixelBlock property of the pixelData object and process them. See the RasterLayer sample for an example of how to apply a pixelFilter to a RasterLayer.
(Added at v3.15)Parameters:
< |
Required | The function defining the PixelFilter to set on the layer. It sets the value of the pixelFilter property. |
Changes the layer's refresh interval to the given value (in minutes). Non-zero value sets up automatic layer refresh at the specified interval. Value of 0 stops auto refresh. (Added at v3.7)
Return type:
LayerParameters:
< |
Required | Refresh interval of the layer in minutes. Non-zero value indicates automatic layer refresh at the specified interval. Value of 0 indicates auto refresh is not enabled. |
Set the scale range for the layer. If
minScale and maxScale are set to 0 then the layer will be visible at all scales. (Added at v3.1)Determines if the layer will update its content based on the map's current time extent. (Added at v3.14)
Sets the visibility of the layer. When true, the layer is visible.
Parameters:
< |
Required | Set the visibility of the layer. |
Event Details
[ On Style Events | Connect Style Event ]
Fires when there is a problem retrieving a layer. Should be used in favor of onError. (Added at v3.5)
Event Object Properties:
< |
ArcGIS Server error message returned in a JavaScript error object. |
Fires after layer properties for the layer are successfully populated. This event must be successful before the layer can be added to the map. Should be used in favor of onLoad. (Added at v3.5)
Event Object Properties:
< |
The loaded layer. |
Fires when the layer opacity has been changed, and returns an object with the opacity value. Should be used in favor of onOpacityChange. (Added at v3.5)
Event Object Properties:
< |
Fires when the layer opacity (transparency) changes. A number property named opacity that indicates the new opacity. Values range from 0.0 to 1.0, where 0.0 is 100% transparent and 1.0 has no transparency. |
This event is fired when the layer's
refreshInterval is modified. (Added at v3.7)Fires when a layer's minScale and/or maxScale is changed. Should be used in favor of onScaleRangeChange. (Added at v3.5)
Fires when a layer's scale visibility changes. The scale visibility changes when a layer is initially visible and becomes invisible because the map scale does not intersect the layer's scale range or vice versa. Should be used in favor of onScaleVisibilityChange. (Added at v3.5)
Fires any time a layer has finished loading or updating itself.
For an ArcGISTiledMapServiceLayer,
the event fires when all required tiles have been retrieved and displayed. For an
ArcGISDynamicMapServiceLayer or
ArcGISImageServiceLayer, the event fires
when the map image has been retrieved and displayed. For a GraphicsLayer,
the event fires when all graphics have been redrawn after a pan or zoom.
Deprecated at v2.0. Use update-start and update-end instead. (Added at v3.6)
Fires when a layer has finished updating its content. It is the responsibility of the subclass to determine when this event is fired. Should be used in favor of onUpdateEnd. (Added at v3.5)
Event Object Properties:
< |
Optional argument. The error object is available when an error occurs during the update. |
Fires when a layer begins to update its content. It is the responsibility of the subclass to determine when this event is fired. Should be used in favor of onUpdateStart. (Added at v3.5)
Fires when the layer visibility has been changed, and returns an object with a Boolean visible property containing the new visibility value of the layer. Should be used in favor of onVisibilityChange. (Added at v3.5)
Event Object Properties:
< |
Fires when the layer visibility changes. A boolean property named visible indicates whether or not the layer is visible after visibility changed. |