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Global ocean lagrangian trajectories based on AVISO velocities, v2.2

Latest Data Update: 2021-07-07
Status: Ongoing
Online Status: ONLINE
Publication State: Citable
Publication Date: 2021-08-19
DOI Publication Date: 2021-09-08
Download Stats: last 12 months
Dataset Size: 8.04K Files | 6TB


The National Centre for Earth Observation (NCEO) Long Term Science Single Centre (LTSS) Global Ocean Lagrangian Trajectories (OLTraj) provide 30-day forward and backward Lagrangian trajectories based on AVISO (Satellite Altimetry Data project) surface velocities. Each trajectory represents the path that a water mass would move along starting at a given pixel and a given day. OLTraj can be thus used to implement analyses of oceanic data in a Lagrangian framework. The purpose of OLTraj is to allow non-specialists to conduct Lagrangian analyses of surface ocean data.

The dataset has global coverage and spans 1998-2019 with a daily temporal resolution. The trajectories were generated starting from zonal and meridional model velocity fields that were integrated using the LAMTA (6-hour time step - part of ) as described in Nencioli et al., 2018 and SPASSO (Software package for and adaptive satellite-based sampling for ocean graphic cruises containing LAMTA) software user guide. Please see the documentation section below for further information.

Version 2.2 is a higher resolution version of V2.0 and also has double value for time variables to permit access via THREDDS

Citable as:  Dall'Olmo, G.; Nencioli, F. (2021): Global ocean lagrangian trajectories based on AVISO velocities, v2.2. NERC EDS Centre for Environmental Data Analysis, 08 September 2021. doi:10.5285/5c2b70d069cb467ab73e80b84c3e395a.
Abbreviation: Not defined
Keywords: AVISO, Global, Ocean Lagrangian Trajectories, LAMTA, zonal, meridional model, OLTraj_SEALEVEL_GLO_PHY_L4_REP_OBSERVATIONS_008_047


Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data were produced by the NCEO Plymouth Marine Laboratory project team and supplied for archiving at the Centre for Environmental Data Analysis (CEDA).

Data Quality:
Validated by Plymouth Marine Laboratory Science Team
File Format:

Process overview

This dataset was generated by the computation detailed below.

NCEO OLTraj V2.2


The trajectories were generated starting from zonal and meridional model velocity fields from the AVISO project; please see the Global ocean gridded L4 sea surface heights and derived variables reprocessed reference in the documentation section for more details on the dataset. The output of which was integrated using the LAMTA package (6-hour time step) as previously described in Nencioli et al., 2018 (also available in the documentation section).

The computing is similar to that of OLTraj v2.0 but is of higher resolution and supports double value for time variables instead of int64

Input Description


Output Description


Software Reference


  • var_id: lat
  • var_id: lon
  • var_id: time
  • var_id: trajlat
  • var_id: trajlon

Co-ordinate Variables

Temporal Range
Start time:
End time:
Geographic Extent