# Concepts

Background and design explanations for how VoxCity represents the world. These
pages help you understand *why* the model behaves the way it does, rather than
walking through a specific task.

```{toctree}
:maxdepth: 1

voxel_model
coordinate_systems
```

```{toctree}
:hidden:

coordinate_systems_ja
```

- {doc}`voxel_model` — how VoxCity turns geospatial layers into a 3D voxel grid.
- {doc}`coordinate_systems` — the coordinate and geodesy conventions used
  internally (a full Japanese deep-dive is also available in
  {doc}`coordinate_systems_ja`).