A maritime HGTFS feed built from CLIWOC, the Climatological Database for the World's Oceans — ~287,000 dated ship-logbook positions, 1662–1855. It renders as animated sea lanes in the HGTFS viewer, alongside the railway feeds.
| file | rows | |
|---|---|---|
agency.txt |
8 | flag nations (NL, UK, ES, FR, SE, US, DE, DK) |
routes.txt |
8 | one water route per flag (route_type = 1000) |
stops.txt |
14,656 | 1° grid nodes (sea-lane waypoints) |
network_edges.txt |
111,985 | dated sea-lane segments |
route_operators.txt, historical_sources.txt, events.txt, feed_info.txt |
operators, provenance, context |
- A voyage is one contiguous run of CLIWOC's
IDcolumn (each ID is one voyage). - Every fix is snapped to a 1° grid cell, so waypoints shared between voyages merge into reusable nodes (this is the "sea-lanes" density view).
- Consecutive distinct cells within a voyage become an edge, keyed by
(cellA, cellB, flag)and dated to the earliest observed traversal —date_openedis a lower bound (open_by_<year>), the same HGTFS uncertainty model the rail feeds use. - Flag nationality (
C1) → agency/operator; edges are coloured by flag. - Segments longer than 10° (logbook gaps / jumps) are dropped, not drawn.
<viewer-url>?repo=openhistorymap/cliwoc
It is also merged into the global feed at
hgtfs/aggregate (?repo=hgtfs/aggregate).
The 160 MB source TSV is not committed. Download it, then rebuild:
wget https://media.githubusercontent.com/media/stvno/stvno.github.io/master/page/cliwoc/CLIWOC21.tsv
python3 build_cliwoc_hgtfs.py CLIWOC21.tsv # writes hgtfs/ + hgtfs.zip (stdlib only)Tunables at the top of build_cliwoc_hgtfs.py: GRID_DEG (cell size),
MAX_EDGE_DEG (max drawn segment).
- This is the coded (ICOADS/IMMA) CLIWOC variant: positions + flag, but no ship names or named ports, so nodes are grid coordinates, not harbours.
- Coverage is dominated by Dutch, British and Spanish logs; it reflects what was digitised, not all historical traffic.
- Edges are observed traversals, dated by first sighting — a lane's true first use predates the log.
CLIWOC — García-Herrera, Können, Wheeler, Prieto, Jones, Koek et al. (2005),
https://cliwoc.org/. TSV mirror: stvno/stvno.github.io.