Mask

By specifying a mask, you can search for pixels, points, segments or polygons with a certain class name, ID or value. A mask is in fact a simple query to find (retrieve), display or use only those pixels, points, segments or polygons in a map that have certain class names, identifiers or values. A mask contains one or more search strings in which wild cards, asterisks (*) and question marks (?), are allowed. You can enter as many search strings in a mask as you like; separate the strings by commas. For more information, see How to use masks.