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Web Viewer Bundle

NullCad can export a self-contained .ncweb bundle for a companion browser/phone viewer — useful for reviewing a survey project in the field without running the full desktop application.

What’s in the bundle

.ncweb is a ZIP archive containing:

  • manifest.json — CRS, extent, camera position, layer list.
  • features.geojson — geometry as GeoJSON, with styles resolved (colors, line weights, etc.) at export time so the viewer doesn’t need to replicate NullCad’s full styling logic.
  • resources/ — embedded resources (e.g. reference images) needed by the viewer.

Exporting

File ▸ Export ▸ Web Viewer Bundle…, then choose an output location for the .ncweb file.

The viewer

The companion viewer is a TypeScript Progressive Web App (PWA), designed for field/phone use — it opens a .ncweb bundle and renders the exported geometry with the resolved styles, without needing network connectivity once loaded.

Keeping exporter and viewer in sync

The .ncweb format is produced by the Rust exporter (src/gis_io/native/web_bundle.rs) and consumed by the separate viewer/ TypeScript project. Because the format is shared between two independently built codebases, changes to the bundle’s schema need to land on both sides together.