Bonsai Add-on Importing geospatial data

From Wiki.OSArch

Goal

Creating a 3D model of a building site with contours.

What you'll need

  • 3D elevation data (in my case .las scan)
  • 2D data (in this case .shp landregister borders)
  • BlenderGIS
  • Sverchok
  • Cloudcompare

Workflow

Get the data

Decide on geographical metadata

  • CRS representedy by EPSG number
  • Project origin in your CRS

Get land registry map and elevation data. A list of public sources:

If the CRS of some of your data differs to the one you want to work with, you have to transform it. QGis is grat for this.

Prepare the data

The first step to combining any geographical data, is to make sure it uses the same crs as your project. So make sure you download the correct version, or reproject it using qgis. BlenderGIS can only import dxf or shp. Czech server provides land registry map as .shp, so that's solved. The DMR 5G laser scan is provided as .las point cloud so we'll use Cloudcompare to move it tou our pcs and convert it to a mesh:

  1. start Cloudcompare and open the las file. When asked to transform the coordinates input your project origin as a shift: Screenshot 2025-03-29 140322.png
  2. Convert it to a mesh surface with Edit > mesh > Delaunay 2.5D XY Plane
  3. Edit > Edit global shift and scale > set to 0 (this removes the reference to the original CRS and sets origin of your mesh to your project origin)
  4. Save as some mesh file Blender can read, I use .obj
  5. Import in Blender, in case of .obj you have to specify directions of your pcs axes (usually Forward Y, Up Z)

Set up IfcProject with BlenderGIS

  1. Create new Bonsai project

Import everything

Generate contours

Add annotations

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