Trispace resolves the requirement to effect three dimensional terrain studies through the generation of: digital elevation plans, contoured elevation plans, dynamic sections, three dimensional views, distances or areas and volume calculations. Thus this program becomes a useful tool both in geological fields due to the extreme facility in creation of longitudinal sections, as in the more strictly topographical one as it imposes no limits regarding either triangulation points nor on the number of sections. Further thanks to its integration into geotechnic and geological GeoStru programs it allows the resolution of computational problems connected with Slope Stability and Rock Fall.