Last updated on Apr 24, 2026.
Topography imports ground point data from LAS or LAZ files and turns it into Revit terrain. It helps you choose coordinate handling, reduce density where needed, and decide whether the output should be a TopoSurface or a Toposolid.
Use it when a point-cloud survey needs to become a manageable terrain model inside Revit.
Getting started
Overview
The Topography workflow starts with a LAS or LAZ file, filters the useful points, applies coordinate offsets, and then creates terrain geometry in Revit. The tool is focused on ground-point workflows rather than a full point-cloud authoring environment.
In the confirmed behavior, the import emphasizes classification 2 ground points and gives you control over density and optional high-detail zones.
Requirements
- A supported Revit version with Topography installed.
- A LAS or LAZ file that contains the survey data you want to use.
- Enough local storage for temporary processing and output files.
- A clear decision on whether the project should receive a TopoSurface or a Toposolid result.
Install and uninstall
Deploying to multiple machines? This section covers standard local installation. For automated deployment by IT administrators or BIM managers, see the Silent Installer Guide.
Install
- Close Revit.
- Run the Topography installer with administrator rights.
- Complete the installer steps.
- Start Revit and confirm the command is available.
Uninstall
- Close Revit.
- Use the Windows uninstall entry for Topography.
- Confirm removal and reopen Revit after uninstall completes.
Import workflow
Load the point cloud
- Open Topography from the ribbon.
- Select the LAS or LAZ file to process.
- Review the file bounds and available point information.
- Choose the initial output type before generating the model.
Offsets and density
Coordinate handling is one of the most important parts of the import. Use automatic offsets when the survey workflow is already well understood, and switch to manual offsets when the incoming coordinates need closer control.
- Review automatic versus manual offset mode before generating the terrain.
- Reduce point density when the survey contains more detail than the project needs.
- Use a high-density zone only where the model genuinely needs extra local accuracy.
Generate the terrain
Once the point set and offsets look correct, create the final Revit terrain. Choose TopoSurface or Toposolid according to the project standard and the Revit version in use.
Zones and output
High-density zones
Use a high-density zone only where the site needs extra definition, such as around detailed design work. Avoid applying maximum detail everywhere unless the full model really needs it.
CSV export and storage
The tool can also write processed points to CSV. This is useful when the point processing needs to be reviewed outside Revit or reused in another workflow.
Troubleshooting and FAQ
The import is too heavy
Cause: The source data is denser than the model requires.
Fix: Reduce the density and use high-detail zones only where the added detail matters.
The terrain is positioned incorrectly
Cause: The offset mode does not match the incoming coordinate system.
Fix: Recheck automatic versus manual offsets and rerun the import with the correct positioning method.
The result looks limited in trial mode
Cause: Trial behavior can restrict density and related advanced options.
Fix: Confirm whether the current installation is licensed when you need the full terrain workflow.
Does Topography use every point in the cloud?
No. The confirmed workflow emphasizes ground points, especially classification 2, so the terrain is built from the point set intended for site modeling.