G1.06

G1.06 Lack of a common effort in metadata harmonization

Gap detailed description

Metadata is an increasingly central tool in the current web environment, enabling large-scale, distributed management of resources.  Recent years have seen a growth in interaction between previously relatively isolated communities, driven by a need for cross-domain   collaboration and exchange. However, metadata standards have not been able to meet the needs of interoperability between independent standardization communities. Observations without metadata are of very limited use: it is only when accompanied by adequate  metadata (data describing the data) that the full potential of the observations can be  realized. Several efforts have been undertaken to improve the harmonization of metadata across the networks and international programs, but this is still not sufficient.   Harmonization effort in the atmospheric science community is related to the WIGOS   (https://www.wmo.int/wigos)  standard,  currently under development and subsequent implementation at the WMO, and by the ESA Climate Change Initiative (CCI [1]).

Activities within GAIA-CLIM related to this gap

An attempt to address this gap within GAIA-CLIM will be undertaken as part of Task 1.2 whereby metadata will be collected and then delivered in a useable set of formats for a selected set of networks which may plausibly contribute to the Virtual Observatory activity.

GAIA-CLIM task 1.2, deliverable D1.7 – Report on the collection of metadata from existing network and on the proposed protocol for a common metadata format (CNR; M18).

Gap remedy(s)

Remedy

Specific remedy proposed

Within GAIA-CLIM Task 1.2 / WP5 and, in synergy with WIGOS and ESA-CCI representatives, we will provide a unified metadata format (UMDF) that will aim to extend and integrate additional important elements into the WIGOS format (while keeping  the various formats interoperable). After selecting relevant initial candidate metadata formats (ISO, WIGOS, ESA-CCI), the UMDF will be developed. The UMDF shall hold relevant parameters common to all original data formats. In addition, it will preserve the «original MD» as an additional field «original xml» at the end of each database document in a MD collection, thus preserving the ability to export in the original data formats upon request if needed.

Measurable outcome of success

 Use of the proposed UMDF within GAIA-CLIM and by downstream users of the Virtual Observatory.

Achievable outcomes

Technological / organizational viability: medium, this is a demonstration activity but not extremely challenging to be implemented in an efficient way.

Indicative cost estimate: low (<1 million)

Relevance

The proposed UMDF is a significant attempt to improve the metadata harmonization at the international level and its benefit may be expected to be large and affecting many (primarily expert) data users.

Timebound

This UMDF will be defined by September 2016 (deliverable D1.7) and finalized by end of the project within WP5. It will build up from the dialogue established with WIGOS and ESA-CCI (making use of CF convention).  The GAIA-CLIM metadata  will  be used  for all  the  reviewed networks,  but also  for  the all  the  data records that  will  be available  on the  GAIA-CLIM virtual  observatory  (WP5).

A final version of the UMDF will be finally released and implemented by the end of the GAIA-CLIM project (Feb. 2018).

Gap risks to non-resolution.