OpenCivil3D — survey to CAD, no license required

OpenCivil3D

Surface & contours

Contour interval (m) Major every Nth Smooth contours

Profile

Vertical exaggeration Sample step (m) Colour

Cross-sections

Interval (m) Half-width (m) Sample step (m) Vertical exaggeration

Display

Station labels every (m) Theme

Performance

High-DPI rendering Simplify while moving

Import survey points

Column format

sn	E	N	Z	code

Import DXF

Pick the layers that carry your contour / elevation data.

	Layer	Polylines	Points	Z range

Use polyline vertices as surface points (build TIN) Also import POINT entities as survey points

Import Custom Points

Custom points are placed on the map only (not added to the surface / TIN). Load from CSV, TXT or XLSX.

Column format

X/E	Y/N	Z/Elev	code

Line from coordinates

Type one X,Y pair per line — or paste straight from AutoCAD: select the line, run LIST, and copy the text output (LINE and POLYLINE both work). Extra columns such as Z are ignored.

Import survey points

Import DXF

Import Custom Points

Line from coordinates

Export DXF