How to develop a dem map

[Antonio Rodríguez Verdugo]

Hi all,

I'm trying to develop a dem map, but instead of altitudes, I want to
display animal and plant population densities. I've tried with v.digit to
create a contour map, then v.to.rast, and then r.surf.contour. But I do not
get a good result. I think my problem is in the v.digit module, I don't
know exactly how to define the lines or areas regarding  densities.

Thanks in advance

Antonio Rodríguez V
IRNAS-CSIC
Sevilla, Spain