Tide Gauge Stations Network – Observations

This Geographic Dataset (GD) contains the geographic locations of the active and historical tide gauge stations operated by the Portuguese Hydrographic Institute, as well as their near-real-time (NRT) sea surface height (SSH) observations.

The SSH observations (http://vocab.nerc.ac.uk/collection/P07/current/CF15N1/) are provided in Coordinated Universal Time (UTC, ISO 8601) and are referenced to the Hydrographic Zero (ZH, EPSG:10349). Quality control (QC) flags comply with the vocabulary available at https://vocab.nerc.ac.uk/collection/L20/current/.

The processing levels follow an internal convention. Level L1 corresponds to data without quality control (QC). Level L2 corresponds to data that have undergone automatic QC (e.g., range checks, spike detection, and temporal consistency tests).

Active tide gauge stations:

tide_obs_stations_nrt

Available datasets:

tide_obs_data_nrt_l1 – Near-real-time (NRT) data without QC (L1), sampled every 10 or 60 seconds, with a latency of 1 minute and a rolling time window of 8 days.

tide_obs_data_nrt_l2 – Near-real-time (NRT) data with automatic QC (L2), sampled every 5 minutes, with a latency of 1 day and a rolling time window of 15 days.

Historical tide gauge stations:

tide_obs_stations_hist

To access the complete observation time series, or specific historical periods, a request should be sent to cedencia.dados@hidrografico.pt.

This dataset is part of the High-Value Datasets (HVD) identified under Implementing Regulation (EU) 2023/138 of Directive (EU) 2019/1024 on open data and the reuse of public sector information.

Citation:

Instituto Hidrográfico (2026): Rede de estações maregráficas - Observações. https://doi.org/10.71683/107bf4e8-ca3e-4bb7-9439-b99f631eee57

 
Citation proposal
(2026) . Tide Gauge Stations Network – Observations. https://snig.dgterritorio.gov.pt/rndg/srv/api/records/107bf4e8-ca3e-4bb7-9439-b99f631eee57
 

Simple

Date ( Publication )
2026-05-06
Identifier
http://id.igeo.pt/cdg/107bf4e8-ca3e-4bb7-9439-b99f631eee57
Credit
Instituto Hidrográfico (https://www.hidrografico.pt/)

  Point of contact

Maintenance and update frequency
As needed
Keywords
Keywords
  • infoMapAccessService , InfoFeatureAccessService , HVD , NODC-PT , Observações , Marés , Observação da Terra e do ambiente
Keywords
Keywords
theme.Seadatanet Parameter Disciplines.rdf theme.Seadatanet Parameter Disciplines.rdf ( Theme )
  • Oceanografia física Oceanografia física Physical oceanography
GEMET - INSPIRE themes, version 1.0 GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Características oceanográficas Características oceanográficas Oceanographic geographical features
Access constraints
Other restrictions
Other constraints
Acesso público sem restrições Acesso público sem restrições
Use constraints
Other restrictions
Other constraints
Sem restrições. Licença de utilização - CC-BY-4.0 (https://creativecommons.org/licenses/by/4.0/)
Spatial representation type
Vector
Spatial representation type
Text, table
Denominator
0
Metadata language
Portuguese Portuguese
Character set
UTF8
Topic category
  • Oceans
N
S
E
W


Extent type code
true
Geographic identifier
PT
Reference system identifier
EPSG / 4326
Distribution format
  • WFS (2.0.0 )

    Specification

  • WMS (1.3.0 )

    Specification

  • OGC API - Features (API - Features )

    Specification

  Point of contact

OnLine resource
https://webgeo4.hidrografico.pt/geoserver/oceanography/tide_obs_stations_nrt/ows?service=WFS&version=2.0.0&request=GetCapabilities  
OnLine resource
https://webgeo4.hidrografico.pt/geoserver/oceanography/tide_obs_stations_nrt/ows?service=WMS&version=1.3.0&request=GetCapabilities  
OnLine resource
https://api-features.hidrografico.pt/collections/tide_obs_nrt  
Hierarchy level
Dataset

Conformance result

Date ( Publication )
2010-12-08
Explanation
Ver a especificação citada.
Pass
false
Statement
N/A

gmd:MD_Metadata

File identifier
107bf4e8-ca3e-4bb7-9439-b99f631eee57   XML
Metadata language
Portuguese Portuguese
Character set
UTF8
Hierarchy level
Dataset
Hierarchy level name
Conjunto de dados geográficos (Não enquadráveis no INSPIRE)
Date stamp
2026-07-31T14:46:45
Metadata standard name
ISO 19115 Sistema de Metadados dos Açores

  Point of contact

 
 

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