RasterLayer

A layer that can visualize raster data (from a raster data source). In its simplest form, raster data consists of a matrix of cells (or pixels) organized into rows and columns (or a grid) where each cell contains a value representing information. Raster layer can support these main types of raster data sources:

  • Raster files - path to a file on the device

  • Remote ArcGIS Image services, see ImageServiceRaster

  • Raster files within GeoPackages, see GeoPackageRaster

  • Mosaic datasets, see MosaicDatasetRaster

You can change how a raster layer is visualized by creating a RasterRenderer and applying it to the layer. Each raster layer supports identify on its individual cells when it is displayed in a MapView or SceneView. The raster layer adopts the loadable pattern; many of its properties are initialized asynchronously. See Loadable for more information.

If a raster dataset has just one value associated with each cell it is called a single-band raster. For example, in a digital elevation model (DEM) each cell contains one value representing the elevation at that location.

A satellite image, however, commonly has multiple bands representing different wavelengths of the electromagnetic spectrum. Landsat imagery, for example, contains seven bands that represent data from the visible and infrared parts of the spectrum. Rasters are particularly useful for remote sensing tasks, such as monitoring vegetation and seeing through smoke to analyze an active fire.

Raster datasets can be quite large. The size of the dataset depends on the following:

  • The geographic extent of the data

  • The size of the cells used (resolution)

  • The number of bands

As with any data consumed locally, file size can be an issue for storage as well as for transferring datasets over the network.

Since

200.1.0

See also

ImageServiceRaster
GeoPackageRaster
MosaicDatasetRaster

Constructors

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constructor(item: Item)

Creates a raster layer from the specified image service portal item.

constructor(raster: Raster)

Creates a raster layer from the specified raster data source.

Properties

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The raster data source for this layer.

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The raster renderer used for this layer.

Inherited properties

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The attribution text for the layer.

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The brightness of the layer.

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open override val canChangeVisibility: Boolean

A flag indicating whether the layer content's visibility can be changed. A flag indicating whether the layer content visibility can be changed. Will return false if an error occurs.

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The contrast of the layer.

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The description for the layer.

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The full extent of this layer, which is the extent where all layer data is contained. You can use this to zoom to all of the data contained in this layer. For feature layers, the extent is retrieved from its FeatureTable.extent.

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open override val fullTimeExtent: StateFlow<TimeExtent?>

The full time extent of the layer. If the layer, such as an ArcGISMapImageLayer, has sublayers with different time extents, fullTimeExtent is a union of its sublayer's time extents.

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The gamma of the layer.

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var id: String

The unique identifying string for the layer, as specified in a map or scene. The id is used by other parts of this API to refer to a specific Layer, such as in a set of FeatureFenceParameters or a FacilityLayerDefinition. If not supplied, all layers will be assigned a unique id when created.

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True if the layer supports identify, false otherwise. The value of this property may not be correct until the layer is in a fully loaded state.

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open override var isPopupEnabled: Boolean

A flag indicating whether the PopupDefinition defined on the PopupSource is enable / disable. Will return false if an error occurs.

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open override var isTimeFilteringEnabled: Boolean

True if the layer filters data based on its GeoView.timeExtent, false otherwise. This is only applicable if the layer's TimeAware.supportsTimeFiltering value is true. If the GeoView.timeExtent value is null, no time filtering is applied and all content is rendered.

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open override var isVisible: Boolean

The layer content's visibility. The layer content visibility. Will return false if an error occurs.

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val item: Item?

The item the layer has been created from.

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open override val loadStatus: StateFlow<LoadStatus>

The load status.

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The maximum scale for the layer. The maximum scale at which this layer is visible. If the map or scene is zoomed in beyond this scale, the layer will not be visible. A value of 0 means there is no maximum scale threshold and the layer will be visible at the smallest scale available for the map or scene. If the value is nil, there is no maximum scale. All of the connected map and scene views will be updated.

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The minimum scale for the layer. The minimum scale at which this layer is visible. If the map or scene is zoomed out beyond this scale, the layer will not be visible. A value of 0 means there is no minimum scale threshold and the layer will be visible at the largest scale available for the map or scene. If the value is nil, there is no minimum scale. All of the connected map and scene views will be updated.

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open override var name: String

The name of this layer.

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The opacity for the layer. The opacity of this layer as a value between 0 (fully transparent) and 1 (fully opaque). The default opacity value is 1.

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open override var popupDefinition: PopupDefinition?

The pop-up definition. The PopupDefinition associated with the popup source. A null if an error occurs or if the popup source is not associated with a pop-up definition.

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open override var showInLegend: Boolean

A flag indicating whether the layer content participates in the legend. A flag indicating whether the layer content is shown in the legend.

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The spatial reference of the layer.

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open override val subLayerContents: StateFlow<List<LayerContent>>

The sub layer contents of a layer content.

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open override val supportsTimeFiltering: Boolean

True if the layer supports filtering data based on its time values, false otherwise.

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open override val timeInterval: TimeValue?

The suggested time slider step size for this time aware layer. You can use this information to set the step size for a time slider control. The value is null if no time interval is suggested. The author of the layer's data typically configures this property if the data has been collected on a regular basis. For example, the daily position of a hurricane.

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open override var timeOffset: TimeValue?

The amount of time by which the temporal values of this layer's data points are offset when displaying it in a GeoView. The time offset is subtracted from the time extent set on the layer's GeoView. This is useful if you want to overlay data in multiple layers that lies within different temporal extents. For example, if you want to compare data in one layer for a certain year with data in the same layer from the subsequent year, you can create two layers that reference the same data's service endpoint but set the TimeValue in one of the layers to be one year.

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val visibilityChanged: SharedFlow<Boolean>

Callback invoked when the visibility of the layer changes.

Functions

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open override fun clone(): RasterLayer

Clones the RasterLayer.

Inherited functions

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open override fun cancelLoad()

Cancels loading metadata for the Loadable object.

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open operator override fun equals(other: Any?): Boolean
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open suspend override fun fetchLegendInfos(): Result<List<LegendInfo>>

Fetches the list of legend info.

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open override fun hashCode(): Int
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open override fun isVisibleAtScale(scale: Double): Boolean

Returns the layer content's effective visibility at the specified scale. Returns the effective layer content visibility. This effective visibility takes care of the effective visibility of the parents at the specified scale. Will return false if an error occurs.

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open suspend override fun load(): Result<Unit>

Loads the metadata for the object.

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open suspend override fun retryLoad(): Result<Unit>

Loads or retries loading metadata for the object.