Polygon Styling
Control how GeoJSON polygon layers are displayed — fill colour, classification, extrusion (3D height), stroke, and labels.
Classification, extrusion, stroke, and label controls appear when the layer's style Mode is set to Advanced. The default Standard mode shows a simplified set of fill, outline, and stroke-width controls only.
Fill colour
Three colouring modes (same as point markers):
| Mode | Description |
|---|---|
| Manual | Single colour for all polygons |
| From dataset | Map a string field to colours per category |
| Gradient | Map a numeric field to a colour ramp |
Fill opacity slider — 0% (fully transparent) to 100% (fully opaque).
Material presets
Material presets apply a ready-made surface style to polygon fills. Use them when you want common planning materials to read clearly without building a colour and texture style from scratch.
Available presets include Water, Vegetation, Pavement, Construction hatch, Boundary hatch, and Parcel grid. Solid presets set colour and opacity. Hatch and grid presets add a repeated texture pattern on top of the fill.
| Setting | Description |
|---|---|
| Material | Select the preset, or choose None to return to manual styling |
| Scale | Changes the spacing of hatch or grid textures |
| Intensity | Controls how strongly the preset colour or texture appears |
Material presets are saved with scenario snapshots and public shares, so reviewers see the same vector styling when a scenario is restored or shared.
The layer Opacity slider works together with the preset's own transparency. For example, a semi-transparent water or hatch preset keeps its material transparency while the layer slider fades the whole layer in or out.
Classification
Classification controls whether polygon styling is applied only to the terrain surface or also to 3D buildings and other classified scene geometry.
| Option | Description |
|---|---|
| Apply to buildings | When enabled, polygon colour and opacity can also appear on buildings that intersect the polygon area. This is on by default |
Turn Apply to buildings off when you want polygons to stay on the ground and avoid tinting nearby 3D buildings.
Extrusion (3D height)
Extrude polygons upward to create 3D shapes.
| Mode | Description |
|---|---|
| None | Polygons are flat on the ground |
| Fixed height | All polygons extruded to the same height (0–2000 m) |
| From dataset | Height driven by a numeric attribute. Set min/max height range, optional overrides, and base height offset |
Extrude building footprints by their height attribute to create a quick 3D city model.
Stroke
- Enable/disable toggle
- Colour — stroke colour picker
- Opacity — 0–100%
- Width — stroke thickness
- Style — solid, dashed, or dotted
- Dash length — controls dash spacing (when dashed style is selected)
Labels
- Enable/disable toggle
- Field — which attribute to display as the label
- Font size — text size
Performance with large polygon datasets
When a GeoJSON layer contains more than 3,000 polygon and line features combined, the platform automatically switches to a batched high-performance renderer. You do not need to do anything — the switch is transparent.
- Clicking features, toggling visibility, and colour, width, and opacity styling continue to work as normal
- Hatch/grid fills and dashed outlines are simplified to their preset solid colour in batched mode
- Changing the opacity slider on a very large layer may take a moment to apply
- Scenario snapshots capture and restore batched layers correctly
See Performance with large datasets in the Layers Overview for full details.