document available features

docs/src/SUMMARY.md

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 # Summary
 
+- [Features](./features.md)
 - [Architecture](./architecture.md)
 
 # Modules

docs/src/features.md

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+# Software features
+Here is a list of the features available in the metadata catalogue
+
+## Metadata module
+- Automatic ingestion of DWCA datasets published on IPT
+- CSW support to explore/query datasets metadata
+- Metadata exposed in ISO 19139
+
+
+## Dataset module
+Current:
+- Expose vector datasets with OGC API - Features (via PyGEOAPI)
+- Different GDAL providers supported (gpkg, shp, parquet, postgresql, csv)
+- Support DWCA dataset
+- Support on-the-fly operation on vectors
+
+Not supported:
+- Other OGC API standards (Coverage, Maps, Tiles, Processes, Records, Environmental Data Retrieval, STAC)
+
+
+## Maps module
+**NOTE**: The software is intended as a solution for displaying datasets on the web using cloud-optimized formats that don't require GIS servers.
+
+Current:
+- Display vector datasets (via PMTiles)
+- Display raster datasets (via Cloud-Optimized GeoTIFF)
+- Organize layers in hierarchy/groups
+- Layer legends
+- Download of the original dataset
+- Style rendering of raster (via TiTiler)
+- Style rendering of vectors (via Maplibre JS)
+- Zoom to bounding box
+- Description of each layer
+- Description of each group
+- Description of the map
+- Custom logo, title
+- Basemaps
+- APIs for create, edit the map
+- Limited UI for simple edit
+- Basic info popup
+
+Not supported:
+- Query/filter datasets features
+- Dynamic style change
+- Dynamic datasets that change frequently
+- Clusters
+- Analysis
+
+
+It's possible to (re)use the Maps module as a base and to customize it or to develop features based for projects with different requirements.