Input data

Three types of input data can be used for reconstruction with City4CFD:

• 2D polygons,
• Point clouds,
• Existing building geometries

2D polygons include building footprints and other surfaces such as green areas, water, and roads.

Point cloud is used reconstruct terrain and calculate building heights. In case of a missing terrain point cloud, the terrain will be approximated as a flat surface.

For building reconstruction, you can use the combination of the following data:

• Building footprint polygons and buildings point cloud,
• Building footprint polygons with height/number of floor attribute,

You can import existing geometries in a CityJSON format.

Supported format for each of the data types is written in the table below.

Input data	Format
2D polygons	GeoJSON
Point cloud	XYZ, PLY (binary and ASCII)
Imported geometries	CityJSON (for now)

Information and tips on the preparation of polygons and point clouds can be found in their respective sections.