FCC FIELD GEO API v1
====================
Base: /api/field/v1/geoexport/{token}/{site|project}/{id}
The token scopes access to exactly one site or project. All coordinates WGS84
(EPSG:4326, lon-lat). GET only. Data is live - each request returns current state.

GET {base}                     JSON index of layer endpoints (this schema)
GET {base}/marks               GeoJSON FeatureCollection - every field mark
GET {base}/structures          GeoJSON - plant structures (points)
GET {base}/segments            GeoJSON - construction segments (lines)
GET {base}/cables              GeoJSON - cable runs (lines)
GET {base}/splices             JSON array - per-fiber splice records
GET {base}/photos              JSON array - photo evidence manifest
GET {base}?fmt=kml             KML document (Google Earth / ArcGIS)
GET {base}?fmt=kml&link=1      KML NetworkLink (auto-refresh every 5 min)

marks properties:      uuid, site_id, feature_type, geom_kind (pin|line|polygon),
                       title, trade, length_ft, created_by, company, created_at,
                       attrs (JSON string of type-specific fields)
structures properties: uuid, kind (manhole|handhole|vault|flowerpot|pedestal|pole|
                       cabinet|fdh|splitter|splice_closure|building|cell_site|co_hub|other),
                       client_id, label, attrs, created_at
segments properties:   uuid, method (bore|trench|plow|microtrench|aerial|conduit),
                       length_ft, attrs, confirmed_at, confirmed_by_trade
cables properties:     uuid, cable_id, construction (loose_tube|ribbon|central_tube|drop),
                       fiber_count, fibers_per_tube
splices fields:        closure, cable_a, fiber_a_start, fiber_a_end, cable_b,
                       fiber_b_start, fiber_b_end, status (spliced|crossed|dead|reserved),
                       tube, type, created_at
photos fields:         file (structured: {site}-{type}-{mark}-{slot}-{uid}.{ext}),
                       feature_title, feature_type, slot, slot_index, by, taken_at, url

Fiber color code: TIA-598. Fields are stable within v1 - additions may occur,
removals or renames will not.