LanDTM is a program to make, edit and draw Digital Terrain Models, contouring maps and volumes calculations. It's integrated in AutoCAD and BricsCAD CAD, Computer Aided Design, programs. Not only the DTM creation with a reliable delaunay triangulation algorithm but this program it's prepared for civil engineers and surveyors because it has the possibility to include break-lines and to draw the contour lines without smoothing or with a reliable smoothing algorithm and too, you can add labels on the contour lines. The program works in Autocad 2007/2008/2009, Autocad 2010 and BricsCAD v10. I've gotten the 'Protopo' libraries, (a famous spanish engineering civil and surveying program), and I've built this program.