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
 

INSPIRE

Identification

File identifier
107bf4e8-ca3e-4bb7-9439-b99f631eee57   XML
Hierarchy level
Dataset
Online resource
Protocol
null
Resource identifier
code
http://id.igeo.pt/cdg/107bf4e8-ca3e-4bb7-9439-b99f631eee57
Metadata language
Portuguese Portuguese
Spatial representation type
Vector
Spatial representation type
Text, table
Encoding
Format
WFS
Version
2.0.0
Specification
Format
WMS
Version
1.3.0
Specification
Format
OGC API - Features
Version
API - Features
Specification
Projection
code
4326
 

Classification of data and services

Topic category
  • Oceans
 

Classification of data and services

Coupled resource
Coupled resource
 
 

Classification of data and services

Coupled resource
Coupled resource
 
 

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
Other keywords
Keywords
Keywords
  • infoMapAccessService , InfoFeatureAccessService , HVD , NODC-PT , Observações , Marés , Observação da Terra e do ambiente
Keywords
Keywords
 
 

Geographic coverage

N
S
E
W


 

Temporal reference

Temporal extent
Temporal extent
Date ( Publication )
2026-05-06
 

Quality and validity

Lineage
N/A
Denominator
0
 

Conformity

Conformity
Conformity
 

Conformity

Conformity
Conformity
 

Restrictions on access and use

Access constraints
Acesso público sem restrições Acesso público sem restrições
Access constraints
Sem restrições. Licença de utilização - CC-BY-4.0 (https://creativecommons.org/licenses/by/4.0/)
 

Restrictions on access and use

 

Responsible organization (s)

Contact for the resource
Organisation name
Instituto Hidrográfico
Email
centrodados@hidrografico.pt
 

Responsible organization (s)

Contact for the resource
Organisation name
Instituto Hidrográfico
Email
centrodados@hidrografico.pt
 

Metadata information

Contact for the metadata
Organisation name
Instituto Hidrográfico
Email
centrodados@hidrografico.pt
Date stamp
2026-07-31T14:46:45
Metadata language
Portuguese Portuguese
Character set
UTF8
 
 

SDS

Conformance class 1: invocable

Access Point URL
Endpoint URL
Technical specification
 

Conformance class 2: interoperable

Coordinate reference system
 
Quality of Service
 
Access constraints
Limitation
 
Use constraints
Limitation
 
Responsible custodian
Contact for the resource
 
 

Conformance class 3: harmonized

 
 

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