  The original Hardenberg's model of biomass patterns in arid and semi-arid
regions is revisited to extend it to more general non flat regions. It is
proposed a technique to study these more generalized (non-flat) regions using
both a conservation criterion and a explicit spatial dependent function $\nu
(x)$. In this paper a study of dynamical stability around system's fixed points
made. Under the idea of predictability via air images a fitted relationship
among dynamical variables at stable fixed points is stablished. Also, is
presented a discrete version of the model, in the form of Cellular Automata
techniques, that allows to neglect the spatial scale and reproduces realistic
stable spatial patterns.
