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Metocean Web Application

PosMet: LR's Global Metocean Data Portal.

Lloyd's Register's PosMet web application provides easy access to hindcast and forecast Metocean data for any offshore Position across the globe.

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Overview

The primary objective of PosMet is to maximize the user’s knowledge and understanding of metocean conditions for a site location, through the prism of an intuitive web application.

Multi-parameter global metocean data are published at 1 and 3-hour intervals respectively by the National Oceanic and Atmospheric Administration (NOAA) in the US and by Copernicus, the European Union’s Earth Observation Programme. Both data platforms are widely used in the maritime and offshore energy sectors.

As soon as each model update is published, PosMet downloads the data files and decodes the constituent parameters which are then stored within LR’s cloud-hosted metocean data lake, with spatial resolution of up to 0.083° lat and lon. More than 7 years of hind-cast metocean data is now available.

Metocean Parameters

  • Significant Wave Height
  • Maximum Wave Height
  • Wave Period
  • Swell Height
  • Swell Period
  • Wave Direction
  • Wave Speed
  • Wind Speed
  • Wind Direction
  • Tidal Height
  • Tidal Current Speed and Direction
  • Ocean Current Speed and Direction

Data Sources (Models)

  • EU Copernicus
  • NOAA Wave Watch 3
  • NCEP National Centre for Environmental Prediction
  • Global System Forecast Model (GFS)
  • Oregon State University Tidal Inversion Model (OTIS)

Metocean Observations

PosMet also includes access to over 600 global metocean observations sites, delivering up-to-the-minute wind speed and wave height data which may also be as a useful validation of the Copernicus and NOAA model data. Observation data sources include:

  • US National Data Buoy Center
  • UK Met Office
  • UK Channel Coast Observatory

Tidal Observations

Users can access global tidal height, speed and direction predictions, computed using the Ohio State University OTIS model.

Core Functionality

Whilst the metocean data published by EU Copernicus and NOAA is in the public domain, each update is made within large and complex exchange formats.

As soon as each new dataset is published, the PosMet back end harvests the file and decodes and stores the parameters within the metocean data lake. The parameter data is then immediately available to users within the intuitive front end PosMet web application.

New Metocean Data Sources

PosMet users will automatically gain access to further metocean datasets as they become available and added to the data lake.

Site Selection

The user can select a Site Location through point and click upon a comprehensive energy sector basemap or hydrographic chart layer. An Observation Site is similarly selected, from those available on the web map.

Data Presentation

Selected metocean parameter data are presented as time series and directivity plots across user selected year/month combinations. Nudge buttons enable previous or subsequent months to be loaded. A 'Print' function generates a PDF report.

PosMet Time Series Presentation
PosMet Time Series Presentation

Data Export

Selected data may be exported as a CSV file for further analysis within applications such as Excel.

API Service

PosMet communicates with it's data lake using a restful Applications Programming Interface (API). Using this architecture, the metocean data may be incorporated into third party applications.

Example Use Case

In the offshore energy sector, a regular requirement is to assess the likely duration of a planned offshore survey or site investigation project, where the sea and weather conditions may have a significant degree of impact on project duration and cost.

Using PosMet, the user can select the project Site Location and the planned month for the operation. The required metocean parameter(s) can then be selected, for example Significant Wave Height, which can then be replayed for the selected month for each of the past 7 years.

Users can enter vessel workability thresholds, including significant wave height, wind speed and swell period. This allows the amount of workable weather and weather standby to be assessed.

Similarly, where a project has been completed, the as-experienced metocean data for the site location during the project can be reviewed. Selecting a local Observation Site provides useful comparisons and supports validation of the Copernicus and Wave Watch 3 model data.

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