The Expression template appears in the template list when a raster tile field, of type Tile, has been picked in the Transform pane. The template computes the specified SQL expression that evaluates to a Tile data type.
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Save the tile result of the given expression into the specified tile Result destination, creating new fields using the specified tile data type.
Launch the template by choosing a Tile field and then double-clicking the Expression template. When the template launches we can specify options.
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Example: TileMaskRange Expressions - Using the TileMaskRange SQL tile function within an expression in the Transform pane to mark as missing pixels a desired range of pixel values in a single channel Landsat image. The TileMaskRange function is a fast way to eliminate unwanted black or white regions outside of non-rectangular visible pixel regions, like the black border regions in a rotated Landsat image.
