Can raster data have an attribute table?
Each raster dataset in a raster catalog can have its own attribute table. The method of storage is simple and easy to manage; however, you could end up with many tables in the database, some of which may be identical (for example, if raster datasets in the catalog have the same attributes).
Why does my raster not have attribute table?
The mechanism to automatically build a raster attribute table is not available in ArcGIS Desktop 9.2, as scanning all pixel values to build a raster attribute table on-the-fly is unnecessary if the unique value renderer is not used for displaying raster data in images that are getting larger.
How big is the attribute table in raster?
By default, the size of a raster attribute table is limited to 65,535 unique values. You can increase this number on the Options dialog box by clicking the Raster Attribute Table tab on the Raster tab. If you make a copy of a raster dataset with a raster attribute table, the raster attribute table will be maintained in the copied raster dataset.
Why is the open attribute table in ArcMap unavailable for some raster?
In ArcGIS Desktop 9.2 and later, the Open Attribute Table function in ArcMap is unavailable for some raster datasets when they do not contain a raster attribute table.
Where is the raster attribute table saved in a geodatabase?
Within a geodatabase, the raster attribute table is saved within the raster dataset and hidden from the user. Within a grid, the raster attribute table is saved as a vat.sdf file inside the grid folder.
How are nodata values calculated in a raster dataset?
The graphic below illustrates a raster dataset with attribute table. You can see that the NoData values are not calculated in the raster attribute table. You can also see the three columns that are calculated by default; the other columns can be added individually or by using a join operation.