Engineering Drawing And Plans2D
Civil and Topographic Plans - Terrain, Alignment and Earthwork - Topographic Map
Detailed interpretation of survey-based terrain, contours, profiles, vertical curves, cross-sections, stationing, and earthwork mass balance.
Open the complete lessonTopographic Contour, Slope and Section Studio
Sample one deterministic terrain surface through contours, drainage direction, and a matching section profile.
- Spot elevation
- 176.5 m
- Local slope
- 23.8%
- Downslope azimuth
- 298°
- Profile average grade
- 1.93%
- Profile relief
- 94.6 m
- Contours drawn
- 17
Interpretation: tighter contour spacing indicates steeper terrain. Valley contours generally point uphill while water follows the downhill gradient.
Contour interpolation
Contour segments reuse one precomputed terrain grid, avoiding repeated terrain sampling when only the contour interval changes.
Spot slope
Local slope uses deterministic finite differences over 25 m east and north.
Section profile
The section samples the same terrain function, preserving map-profile consistency.
Classroom terrain only. Survey datum, breaklines, TIN construction, interpolation, contour smoothing, hydrology, and grading decisions require controlled project data.