Definitions for "Height field"
a function that takes as input a two dimensional point and returns a value representing the orthagonal distance to a surface
a set of height distance values sampled at a finite set of sample points in a two-dimensional parameter domain
a two-dimensional bitmap where the value at a point is interpreted as the height at that point
Keywords:  efficent, mountains, fast, complex, way
a fast and efficent way to generally create mountains or other complex surfaces
Keywords:  topographic, map, kind
a kind of topographic map
Keywords:  raster, elevation, model
a raster elevation model