Contour line generator from survey points

Upload the points file from your survey and get contour lines in seconds, on a TIN mesh you can fix by hand so the terrain looks the way it really is.

Open the free app

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What it includes

Delaunay triangulation

High-performance TIN mesh, with diagonal flipping, added or removed triangles and new points with interpolated elevation.

Breaklines

Ridges, road edges and streams, drawn by hand or taken from a layer of your DXF.

Index and intermediate contours

Interval of your choice, index contours every 5 intervals and smoothing for a clean result.

Elevation labels

Aligned with the contour and kept from overlapping each other.

Slope map

Colors by slope class and arrows showing where water runs.

3D view

See the terrain in 3D with adjustable vertical exaggeration.

From a CAD drawing

You can also start from the contour lines or a TIN in a DXF or DWG, and generate new contours from that surface.

How it works

Import the TXT, CSV or XYZ file and choose the columns.
Review the mesh and add breaklines if needed.
Pick the interval and generate the contour lines.
Export the DXF at the plot scale you need.

FAQ

Which contour interval should I use?

It depends on scale and relief: 0.5 m or 1 m for urban sites and subdivisions, and 2 to 5 m for large or steep areas. You can try several and see the result instantly.

Can the contour lines be corrected?

Contours are generated from the TIN mesh, so you correct them by editing the mesh, the breaklines or the points, and they regenerate instantly.

Try it with your own points

It runs in your browser: no account, nothing to install.