OpenCivil3D — survey to CAD, no license required

OpenCivil3D

Contour interval (m) Major every Nth Smooth contours

Vertical exaggeration Sample step (m) Colour

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

Station labels every (m) Theme

High-DPI rendering Simplify while moving

Import survey points

Column format

sn	E	N	Z	code

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

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