What is an elevation point cloud?
An elevation point cloud is a set of 3D points — each with an X (easting), Y (northing) and Z (height) value — that together describe the shape of the ground across an area. Connect the points and you get a terrain surface you can build on in BIM or CAD.
Think of it as the ground sampled on a grid: at regular spacing, you record how high the land is. The denser the sampling, the more faithfully the cloud captures slopes, banks, and detail. It's the rawest, most portable way to describe terrain.
What XYZ CSV looks like
The simplest form is a comma-separated text file, one point per line:
X,Y,Z 523450.0,6175320.0,42.18 523462.0,6175320.0,42.05 523474.0,6175320.0,41.91 ...
X and Y are the horizontal position in a projected coordinate system (metres), and Z is the height above the datum. That's all most software needs to rebuild the surface.
Point cloud vs mesh vs contours
| Form | What it is |
|---|---|
| Point cloud | Raw 3D points, no connections |
| Mesh / TIN | Points joined into triangles to form a surface |
| Contours | Lines joining points of equal height |
A point cloud is the most flexible because every tool can triangulate it into a mesh in its own way.
How architects use it
Import the points, triangulate them into a terrain surface, and use that as the site context: grading, cut-and-fill volumes, drainage, and placing the building at the right level. Topo-grapher generates the point cloud from real government elevation data, so you skip surveying and GIS entirely.
Generate a point cloud free ->Frequently asked questions
What is an elevation point cloud?
A set of 3D points, each with an X (easting), Y (northing) and Z (height) value, that together describe the shape of the ground across an area. Connecting the points produces a terrain surface.
What is XYZ CSV format?
A plain text file where each line holds one point's X, Y and Z coordinate separated by commas. It's the simplest interchange format for elevation data and is read by Revit, Rhino, ArchiCAD and most CAD tools.
How do architects use an elevation point cloud?
They import the points into BIM or CAD software and triangulate them into a terrain surface or mesh, which becomes the site context for grading, cut-and-fill, and placing the building.
Further reading
- ASPRS — publisher of the LAS file format spec, the industry standard for LiDAR point clouds.
- USGS 3D Elevation Program — national LiDAR elevation programme; useful reference for how point-cloud terrain is captured and distributed.