Questo layer mappa i corpi idrici presenti dentro e attorno all'area di interesse: fiumi, torrenti, canali, fossi di drenaggio, canali di marea e laghi da OpenStreetMap, oltre ai mari dalla tabella di riferimento boundaries_seas. Ogni elemento viene disegnato singolarmente con un colore proprio ed e classificato per tipo di acqua (fiume, torrente, lago, canale, fosso, canale di marea, mare) registrato nei suoi metadati, cosi da distinguere i fiumi dai piccoli torrenti, dai canali artificiali e dai canali costieri. Serve a individuare le acque superficiali vicine al sito e a valutarne la distanza dal confine del campo.
Water bodies are retrieved from OpenStreetMap through the Overpass API within a 2.5 km search radius around the area of interest. The Overpass query selects natural=water + water=lake polygons and waterway ways matching river|stream|canal|ditch|drain|tidal_channel. Each feature is classified into a fine-grained water type (river, stream, lake, canal, drain, tidal_channel) mirroring the OSM waterway tag; ditch and drain are merged into drain. Seas are added separately from the internal boundaries_seas reference table. Requests are served by the 3Bee self-hosted Overpass server (Hetzner) with fallback to overpass-api.de and overpass.openstreetmap.fr.
| Code | Provider | Resolution | Year |
|---|---|---|---|
| WRD_OSMXX_99 | OpenStreetMap | vector (rasterized at ~5 m) | continuously updated |
Linear features (rivers, canals, drains) are buffered by about 40 m so they remain visible once rasterized, then each feature is assigned a unique color and rendered at roughly 5 m native resolution (automatically coarsened for very large areas to respect image size limits). For every feature the layer also computes the geodesic distance to the field boundary and its percentage overlap with the field.