SHOM maritime altimetric references (RAM)
SHOM maritime altimetric references (RAM)
France's hydrographic service (Shom) publishes Références Altimétriques Maritimes (RAM) — port tidal/altimetric reference data for metropolitan France and overseas — as PDF, Shapefile and CSV on diffusion.shom.fr, with WMS/WMTS/WFS on services.data.shom.fr.
Coverage
French metropolitan and overseas ports covered by the RAM product (Edition 2025 on the checked diffusion page). Exact station count is Not stated as a single total on that page.
Verdict
This is Shom's official open maritime vertical-reference product for agents that need French port tidal/altimetric datums as a hydrographic and berth-access signal. The product page states it is released under Licence Ouverte (version 2.0, Etalab) with DOI 10.17183/MAREE_COURANTS_RAM. Attribute Shom when you reuse it.
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Use in your agent
Probe SHOM RAM product page in memory. Checked against the provider's documentation on Nov 6, 2026.
Access
- No key. HTTPS GET of the diffusion.shom.fr RAM product page.
Request
curl -sS -L -o shom-ram.html 'https://diffusion.shom.fr/references-altimetriques-maritimes-ram.html'Format
Product page HTML describing PDF/Shapefile/CSV packages plus WMS/WMTS/WFS endpoints; not a JSON REST body.
Load into pandas (in memory)
Needs Python 3 with requests and pandas. The provider's terms limit storage or leave it unclear, so this snippet does not write a file.
"""Probe SHOM RAM product page in memory (Licence Ouverte; writes no file)."""
import requests
import pandas as pd
URL = "https://diffusion.shom.fr/references-altimetriques-maritimes-ram.html"
r = requests.get(URL, timeout=30)
r.raise_for_status()
ok = "Licence Ouverte" in r.text or "licence ouverte" in r.text.lower()
df = pd.DataFrame([{"url": URL, "status": r.status_code, "licence_ouverte_mentioned": ok, "bytes": len(r.content)}])
print(df.to_string(index=False))
Run by us on 2026-11-06 (python 3 | requests). Result: RAM product page returned HTTP 200 on 2026-11-06 and states Licence Ouverte 2.0 (Etalab).
Limits
- Not stated numeric rate limit on the checked diffusion.shom.fr page.
Quirks
- Do not host or commit Shom files in the repo; link and download from diffusion.shom.fr only.
- Open-data products use Licence Ouverte or CC BY-SA depending on the product — read the product page.
- This snippet writes no file; it only probes the HTML entry point in memory.
Terms and attribution
- Product page: "Ce produit est diffusé sous Licence Ouverte (version 2.0 d'avril 2017), définie par la mission Etalab."
- Attribute Shom / cite DOI 10.17183/MAREE_COURANTS_RAM when reusing; this probe does not store or cache Shom payloads.
Sources
- https://diffusion.shom.fr/references-altimetriques-maritimes-ram.html: “Licence Ouverte (version 2.0 d'avril 2017)”
- https://alliance.numerique.gouv.fr/licence-ouverte-open-licence/: “Licence Ouverte / Open Licence”
Information and education only. Not financial, investment, legal or tax advice. Listings can be inaccurate, incomplete or out of date and are provided "as is". Free tiers, limits and licenses belong to each provider and can change, so check the provider's own terms before you rely on them. Terms & Disclaimer