GeoLibre Desktop Architecture

Overview

GeoLibre Desktop is an npm workspaces monorepo. The UI is a React app hosted by Tauri v2. Map rendering uses MapLibre GL JS in the browser webview, with deck.gl used for advanced raster, point cloud, and 3D overlays. Application state lives in a Zustand store (@geolibre/core).

flowchart LR
  UI[React UI] --> Store[Zustand Store]
  Store --> MapPkg[MapController]
  MapPkg --> ML[MapLibre GL JS]
  Plugins[Built-in plugins] --> Store
  Plugins --> ML
  UI --> Tauri[Tauri Plugins]
  Tauri --> FS[File System]
  Proc[Processing] --> Store
  Proc -.-> Sidecar[FastAPI optional]

Packages

Package	Responsibility
@geolibre/core	Domain types, project JSON schema, global store
@geolibre/map	MapLibre lifecycle, layer sync, GeoJSON, raster, tile, MBTiles, control, and selection styling
@geolibre/ui	Shared UI primitives (shadcn-style)
@geolibre/processing	Client-side algorithm registry
@geolibre/plugins	Plugin interface and built-in plugins
geolibre-desktop	Shell layout, Tauri I/O, composition

State flow

1. User adds data through the Add Data menu, the Tauri dialog, browser file picker, drag and drop, or a built-in plugin control.
2. Local vector data is parsed directly or converted to GeoJSON with DuckDB-WASM Spatial, then passed to addGeoJsonLayer in the store.
3. Tile, service, raster, ArcGIS, MBTiles, and plugin-backed layers create GeoLibreLayer records with source metadata and native MapLibre layer ids when applicable.
4. MapCanvas subscribes to layers, then MapController.syncLayers updates MapLibre sources and layers and keeps the layer control in sync.
5. Style panel and layer panel updates change layer state, then map sync updates paint, visibility, opacity, ordering, and removal.
6. Attribute table selections update the highlighted feature source and can zoom the map to the selected feature.
7. Desktop save uses projectFromStore and writes .geolibre.json to disk.

DuckDB-WASM

Vector file import uses DuckDB-WASM for formats that need conversion before MapLibre can render them:

INSTALL spatial;
LOAD spatial;

GeoParquet is read with DuckDB's Parquet reader after loading Spatial. Other local vector formats are passed to Spatial ST_Read when the WebAssembly extension can load the GDAL-backed reader. Zipped Shapefiles are parsed with shpjs first, then DuckDB Spatial is tried if that parser cannot read the file. KMZ archives are unzipped in the browser and their KML files are passed through the same DuckDB Spatial KML reader.

Advanced Add Data workflows

The v0.7.0 Add Data surface includes native dialogs for XYZ, WMS, WFS, vector files, GeoJSON URLs, vector tile sources, delimited text, raster tile templates, COG and GeoTIFF rasters, MBTiles, ArcGIS FeatureServer or VectorTileServer layers, and GPX waypoints, tracks, and routes. The Components plugin wraps maplibre-gl-components panels for FlatGeobuf, PMTiles, Zarr, LiDAR, and Gaussian splats, then mirrors added layers into the GeoLibre store so the Layer panel, project format, and layer control can reason about them.

Local MBTiles tiles are read through a custom MapLibre protocol backed by Tauri commands. Remote rasters are fetched through the desktop backend when needed, and the local development server includes a raster proxy for selected release assets that need CORS handling.

Python sidecar

The FastAPI app in backend/geolibre_server backs the v0.7 Whitebox toolbox through a managed local processing sidecar. The desktop app starts the sidecar on demand, communicates over 127.0.0.1, and keeps the heavier Python processing stack outside the browser bundle.

Future processing releases are expected to expand the same sidecar pattern for GDAL, Rasterio, GeoPandas, DuckDB Spatial SQL, Leafmap, GeoAI, and SamGeo workflows.

Security

• Tauri CSP allowlists tile and style hosts (OpenFreeMap, CARTO).
• File access uses dialog-selected paths only.