# Mesh Document

## Purpose
3D surface or object meshes for scene visualization or analysis.

## GeoJSON (DB metadata)
```json
{
  "type": "Feature",
  "geometry": {"type": "Point", "coordinates": [30.15, 59.95]},
  "properties": {
    "type": "Mesh",
    "title": "Bridge Model",
    "created_at": "2025-05-12T14:00:00Z",
    "updated_at": "2025-05-12T14:00:00Z",
    "source": {
      "url": "/s3/<bucket>/<ResultKey>/<filename>",
      "type": "Mesh"
    },
    "style": {"scale": 1.0},
    "metadata": {"crs": "EPSG:4978", "units": "meters"}
  }
}
```

## Required properties
- `properties.type` = `Mesh`
- A representative geometry (point/centroid or footprint polygon)
- GLTF/GLB or similar payload

## Publishing workflow
1. Export mesh to GLB.
2. Upload and record URL.
3. Publish Feature with type `Mesh` and link via `properties.source.url`.

## Validation checklist
- Coordinate frame and units documented in `metadata`.
- File opens in the target viewer.

See [Common properties](../common.md) for shared fields like legend, metadata, and classification.
See also: [GeoJSON Strategy](../../Geojson_strategy.md) and [Upload Strategy](../../Upload_strategy.md).