Class ImageTiledLayer

  • All Implemented Interfaces:
    LayerContent, Loadable
    Direct Known Subclasses:
    ArcGISTiledLayer, ServiceImageTiledLayer, WmtsLayer

    public abstract class ImageTiledLayer
    extends ImageAdjustmentLayer
    A base class for layers that display cached maps. You would typically work with one or more subclasses of this class.

    ImageTiledLayer defines a base class for layers that display tiled map services and cached image services. This is an abstract class that can be derived in a custom class to implement a local tile data scheme. To implement a custom ImageTiledLayer, for example to load your own local tile data, you should derive from this type and supply the data for each tile as it is requested.

    Additionally, implementers must also supply a TileInfo that describes the tiling scheme, and an Envelope that defines the layer extent.

    Implement this class if you want to create a custom tiled layer where the cached images cannot be referenced by a simple URI. If your images can be referenced by a simple URI, you should instead implement ServiceImageTiledLayer.

    See Also:
    Layer, ServiceImageTiledLayer, ArcGISTiledLayer, WmtsLayer, WebTiledLayer, OpenStreetMapLayer
    • Constructor Detail

      • ImageTiledLayer

        protected ImageTiledLayer​(TileInfo tileInfo,
                                  Envelope fullExtent)
        Creates an ImageTiledLayer based on tile info and full extent. This constructor needs to be called by any custom layers that extend ImageTiledLayer.
        tileInfo - info about the tiling scheme
        fullExtent - full extent of the layer
        IllegalArgumentException - if tileInfo is null
        IllegalArgumentException - if fullExtent is null
    • Method Detail

      • setBufferSize

        public void setBufferSize​(ImageTiledLayer.BufferSize bufferSize)
        Sets the buffer size. This is used to indicate whether or not tiles outside of the current visible extent should be fetched. This can be none, small, medium or large.
        bufferSize - the new buffer size
      • getNoDataTileBehavior

        public ImageTiledLayer.NoDataTileBehavior getNoDataTileBehavior()
        Gets the ImageTiledLayer.NoDataTileBehavior for the ImageTiledLayer. Determines how a tile request that returns 'NoData' is resampled.

        Zooming in can result in tile requests with no tiles at the requested level of detail. In this case, there are options that control what to display where the tile should be.

        Sometimes, to see the effect on the map when setting the ImageTiledLayer.NoDataTileBehavior property, the Layer.getMaxScale() value must also be explicitly set. The Layer.getMaxScale() property may need to be smaller than the level-of-detail setting that was used to create the tiled images in ArcGIS Pro or ArcGIS Desktop. For example, consider an operational image tile layer showing forest cover that was created with the level-of-detail assumption that it was to be viewed above a scale of 5000 (meaning you will not see 'NoData' until you zoom closer to the Earth than a 5000 scale). However, you want to be able to zoom in closer to the Earth surface, say down to 3000 or 300. By setting the Layer.setMaxScale(double) property to a number smaller than 5000, you will be able to zoom in closer to the Earth and see the effects of changing the ImageTiledLayer.NoDataTileBehavior enumerations.
        the NoDataTileBehavior for the ImageTiledLayer
      • getTileInfo

        public TileInfo getTileInfo()
        Returns information on the tile scheme used by the layer.
        information on the tile scheme used by the layer
      • getTile

        protected abstract byte[] getTile​(TileKey tileKey)
        Gets the encoded bytes that represents a tile for the given tile key. The encoding must match TileInfo specified in the constructor ImageTiledLayer(TileInfo, Envelope).
        tileKey - key for the expected tile
        the encoded bytes that represent the tile for the given tile key