Raster data is a picture, but the pixel values stored in it may represent some geographical significance (such as altitude, temperature, pollutant concentration, etc.). ). In most cases, raster data has no attribute table.

For single-band integer ESRI grid data, if its pixel value range is less than 65438+ million (maximum-minimum

For single-band integer data that does not meet the above conditions, VAT will not be created automatically, but ArcGIS will create a virtual attribute table for it.

For floating-point data, the condition for establishing a virtual property table is that there are less than 25 unique values.

The most effective way to manipulate raster data is to use map algebra to process raster pixel values.