wiki:udg/ecoms

Version 59 (modified by gutierjm, 9 years ago) (diff)

--

The SPECS-EUPORIAS Data Server

Different sector-specific impact activities to be undertaken in SPECS and EUPORIAS projects require a reduced number of variables (typically at surface) from different data sources (mainly seasonal forecasts, reanalysis, and observations). The SPECS-EUPORIAS Data Server has been established by the Santander Meteorology Group (UC-CSIC) as part of the data management activities in these projects to provide a unique access for these impact-relevant variables, gathered from existing datasets. The data portal is based on a THREDDS data server providing metadata and data access using OPeNDAP and other remote data access protocols. Moreover, a user-friendly R package has also been developed for exploring and remotely accessing subsets of data, thus reducing the burden of data access in these activities. This package will be also a key component for other tasks of the projects based on R, including the validation and downscaling packages to be developed within SPECS and sector-specific calibration and modeling tools to be developed in EUPORIAS.

This trac/wiki page provides an up-to-date description of the SPECS-EUPORIAS Data Server, including information of the available datasets and the documentation and code of the R data access package. This page is currently under construction, but both a first tutorial describing the basic functioning and a first version of the R package (a R function) are already available:

Dataset catalog: http://www.meteo.unican.es/tds5/catalogs/system4/System4Datasets.html

R code: loadSystem4.R

Tutorial: PDF file

Contents (under development):

    Error: Page SpecsEuporias does not exist

  1. Data Server?
  2. R Package for Data Access?
  3. Other interfaces for Data Access?

Introduction and Motivation

The impact activities on seasonal timescales involved in SPECS and EUPORIAS projects require the use of different data sources (mainly seasonal forecasts, reanalysis, and observations). These activities include the calibration, downscaling, and modelling of sector-specific indices in agriculture, energy, health, etc., building on meteorological information. Typically, only a reduced subset of surface variables (precipitation, temperatures, mean sea level pressure, etc.) or in a reduced number of vertical levels (circulation and termodynamic drivers at, e.g., 850, 500, 200 hPa) is required for these activities. The SPECS-EUPORIAS Data Portal has been established by the Santander Meteorology Group (UC-CSIC) to gather the relevant information from existing datasets in order to provide a unique homogenized access to data for the SPECS and EUPORIAS partners (in particular for impact-users).

The SPECS-EUPORIAS Data Portal is based on a THREDDS Data Server (TDS) providing metadata and data access using OPeNDAP and other remote data access protocols. Moreover, since the R language (http://www.r-project.org) has been adopted for some key tasks in these projects (including the development of comprehensive validation and statistical-downscaling packages) a user-friendly R package has been developed to explore and access the data portal. This package can be used in R programs to remotely access subsets of data, thus reducing the burden of data access (versions for Python and Matlab are also available under request). This package will be continuously updated (keep informed at the documentation URL above) as part of the data management activities to build a data bridge for impact users and for the R developments to be done in these projects.

This document briefly describes the current state of the data portal, which has initially focused on data from the ECMWF's System4 seasonal model, as agreed in the downscaling parallel session of the kick-off meeting.

Example of Data Analysis with R

References

Attachments (18)