The user may define subclasses of this class.
A block raster provides one or more values, corresponding to one or more attributes, for each vertical box situated with respect to an XY grid. Each box is defined in terms of (i) X and Y values determined by its position in a two dimensional grid, and (ii) Z values representing the upper and lower bounds of the box, i.e., the elevations of the top and bottom of the box. Block rasters are practical for example as a means of modelling non-contorted coal seams. The attribute names and values are handled by contents, inherited from Raster.