Where do you get a mosaic dataset from?
A mosaic dataset is created in a geodatabase and can have raster datasets added to it directly, or it can be created—wholly or using a selection—from a raster catalog or mosaic dataset.
How are raster data statistics calculated in ArcMap?
For example, in ArcMap, when a raster dataset without statistics is first added to the data frame, default statistics are calculated from a subset of the dataset when they are needed to render the raster dataset. These statistics are temporary and are not stored with the raster dataset.
What happens when you add a mosaic to ArcMap?
When you add a mosaic dataset to ArcMap, it will be added as a custom group layer. By default, you will see a Boundary, Footprint, and Image layer. If the spatial reference systems of the data and the mosaic dataset or user are based on different spheroids, you may need to define a specific geographic transformation.
When do you calculate statistics for a mosaic?
When you calculate statistics for a mosaic dataset, the base pixels are examined; that is, the source raster datasets with the lowest pixel sizes are examined and the statistics are generated across the entire mosaic. This is why it is recommended that you use a skip factor.
Can you change the default method of mosaicking?
However, if you’re viewing the mosaic dataset as a data source and not modifying it for the benefit of others, you can change the mosaic method from the Image layer. This way, you only impact your display and do not permanently impact others when viewing or accessing the mosaic dataset. There is always a default mosaic method.
How are The rasters arranged in a mosaic?
The mosaic methods include the following: Closest to Center—Enables rasters to be sorted based the ZOrder, then PixelSize, and then by a default order where rasters that have their centers closest to the view center are placed on top. In this example, 12 rasters are displayed using the Closest to Center mosaic method.