Displays raster data in a map or scene. 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.
The unique identifying string for the layer, for example 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.
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.