Arc
Displays data from a ArcGIS Map service using pre-generated tiles. ArcGIS tiled layers consume image tiles provided by an ArcGIS map service or a tile package. Raster tiles are cached by the server at various scales instead of dynamically generating map images at the request of the client application. The client requests the tiles needed at a particular map extent. You can use the ExportTileCacheTask class to generate and download tiles from the service, creating a tile package (.tpk/.tpkx) for use locally on the device. Alternatively, you can use ArcGIS Pro to create a map tile package and provision it to the device. You can tell if an ArcGIS map server is hosting a compatible ArcGISTiledLayer when "Single Fused Map Cache" is true in the ArcGIS REST Services Directory.
Functional characteristics ArcGIS tiled layers do not support reprojection, query, select, identify, or editing.
Performance characteristics Tiled image layers (those that derive functionality from the ImageTiledLayer class) provide fast display of geographic imagery stored in raster files. These rasters typically contain image data acquired from satellite, aircraft, or drones. The resolution of such imagery can be very high, providing a detailed view. With increased resolution comes increased file sizes and potentially slower performance.
Raster tiling is a process that resamples the pixel size at different scales to create images with the appropriate resolution for each scale. The tiling process creates level-of-detail pyramids to efficiently manage how much detail you see as you zoom in and out on the map. Typically, as you zoom closer to the Earth's surface, you want to see greater detail of the geographic information. Tiled image layers allow you to see just the information you need very quickly based on the level-of-detail pyramid at a particular scale, rather than having to load a single large image at once.
Tiles are generated by the server when the service is created. Requests for tiles are made on multiple threads and handled asynchronously. The size of each returned tile increases as the resolution or complexity of the image in the tile increases. For example, high-resolution imagery tiles can be result in larger file sizes than topographic mapping for the same area and map extent.
See also
Constructors
Creates an ArcGIS Tiled Layer object from an item.
Creates an ArcGIS Tiled Layer object from a tile cache.
Creates an ArcGIS Tiled Layer object. If the specified URI is a portal item URL (see PortalItem.PortalItem(String) for the supported URL formats), the underlying PortalItem will be created and accessible through Layer.getItem(). Use this object to create an ArcGIS tiled layer.
Types
Functions
Cancels loading metadata for the Loadable object.
Clones the ArcGISTiledLayer.
Fetches the list of legend info.
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.
Sets the attribution string for the image tiled layer. Set the attribution string for the image tiled layer.
Properties
An API key is a unique key used to authorize access to specific services and resources in ArcGIS Online. It is also used to monitor access to those services.
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.