![]() Overviews generally begin where raster pyramids stop. They are created to allow you to view all the rasters contained in the entire mosaic dataset, not just for each raster. You can create them to cover only a specific area or only at specific resolutions. ![]() However, they differ greatly, because you can control many of the parameters used to create them. They are lower-resolution images created to increase display speed and reduce CPU usage since fewer rasters are examined to display the mosaicked image. With mosaic datasets, like a raster catalog, you can build pyramids for each raster dataset however, you can also build overviews for the mosaic dataset.Īt a basic level, mosaic dataset overviews are like raster dataset pyramids. You cannot build pyramids on a raster catalog however, you can build them on each raster dataset within the raster catalog. Without pyramids, the entire dataset must be read from disk and resampled to a smaller size. ArcMap uses the appropriate level of resolution to quickly draw the entire dataset. ovr file, with the same file name as your raster dataset. Pyramids are additional copies of your original raster dataset that have been successively resampled in decreasing levels of resolution, created as an. The best way to improve and reduce the time it takes to display a large raster dataset is by creating pyramids. Performance tuning for faster drawing Creation of pyramids and overviews The default number of images can be manipulated on the Display tab of the raster catalog's Layer Properties dialog box. To increase display efficiency, this occurs automatically if more than nine images are in the current extent. When you are working with raster catalogs, ArcMap can display your raster catalog as a wireframe (showing an outline of the dimensions for each raster dataset). You can uncheck the Image layer and check on the Footprint or Boundary layers to see either the extents of each raster or the extent of the mosaic dataset. Layer with a minimum of three layers: Boundary, Footprint, and Layer that appears in the table of contents as a special group When you add a mosaic dataset to ArcMap, it is added as a mosaic Learn about accelerated raster rendering Footprints or wireframe Using the accelerated renderer, youĬan smoothly and seamlessly pan and zoom around the data in the display. When working with any raster layer, such as a raster dataset, mosaic dataset, or image service (not raster catalog), you can increase the layer's display performance using accelerated raster rendering. Using faster drawing methods Accelerated renderer There are also geoprocessing tools that can permanently improve the display of your raster data. The Image Analysis window and Effects toolbar provide quick access to modify some properties of your displayed raster data. For instance, you can change the brightness and contrast of your raster and display the raster transparently over other layers. This includes providing faster drawing methods, enhancements, and retaining calculated raster dataset statistics. Enhancing the appearance of the raster dataĪrcMap provides tools to improve the display of a raster.
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