VAT stands for "value attribute table". It goes with a 16 bit integer grid, with values in the range of -32000 to 32000, or an 8 bit byte with values from 0 - 255. For each value in the grid, it provides a definition of the value, a color to use for display, and the number of points in the grid with that value.
This uses a file with the same name as the grid, and the extension ".VAT.DBF". If the file exists, this will be the default display.
You can switch to this display with a right click on the map window, and change the display parameter, If the ".VAT.DBF". does not exist, you can create it by copying a DBF file with the categories and the names, or the program will create a blank file and you will have to enter to names for the categories.
Edit the category names, and the display colors, by editing the ".VAT.DBF" file.
Get a legend with the File, Legend option.
This option was designed for the Landfire Existing vegetation Type, and might need additional work for other data sets. We have a DBF with the vegetation categories, which you can pick when it asks you to copy a definitions file to create the VAT.DBF file.
It works with the files produced by exporting a Geotiff from ArcGIS.
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last modified 2/26/2021