Breadcrumb Home DFTG Computer-Aided Drafting and Design DFTG-2421 DFTG-2421: Topographical Drafting Download Catalog PDF Download Page PDF Program DFTG Computer-Aided Drafting and Design Lecture Hours 3 Lab Hours 3 Credit Hours 4 Course Type N Plotting of surveyor’s field notes. Includes drawing elevations, contour lines, plan and profiles, and laying out traverses. Prerequisites DFTG-1409.