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Naiad

Naiad project

A great effort has been undertaken by several projects (Medspiration, GHRSST, Mersea, soon MyOcean) in order to provide an homogeneous access to satellite swath data, relying on common specification and technologies for metadata, data content, format (NetCDF) and access (ftp, OpenDAP). This effort, while making much easier the life of users and the development of applications requiring and merging these data streams, is still to be strengthened when considering the optimization of the data flow : full resolution swath data are still very voluminous, bandwidth consuming and complicate to manage, due to their sampling pattern, especially when focusing on very regional areas. It is of high interest for applications and users to download only the relevant data for their need, filtering out for instance cloud contaminated sea surface temperature images or swath sections not crossing the area of interest.

This issue as well as the need to intercompare and collocate data from multiple different sources are some of the reasons why we designed the Naiad system, from which we developed the data indexing concept which opens wider perspectives and applications. Thanks to this content and feature oriented cataloging of the data, Naiad is not just a data extraction or visualization interface but also an expanding knowledge database that can be used by scientists focusing on specific events or conditions.

What is Naiad system?

The purpose of NAIAD is to solve the main issues encountered with satellite data and to provide users with a fast and flexible tool to select and extract data within massive archives that match exactly its needs or interest.

What is data indexing?

Data indexing is the core aspect of Naiad that allows more advanced and focused queries in a reasonable amount of time and without needing huge storage or bandwith resources.

Available indexes

StormWatch index

Floyd hurricane as seen by QuikSCAT on 14-Sept-1999 at 10:21 UTC

Scatterometers are satellite embedded microwave radar specially designed to measure the sea surface wind speed and direction under all weather and cloud conditions. Since the launch of ERS-1 in 1991, sea surface winds have been continuously measured at global scale thanks to an uninterrupted series of missions such as ERS-2; ADEOS-1, QuikSCAT, ADEOS-2 and now METOP-A. We have scanned the complete archive of some of these missions (currently ERS-1, ERS-2, QuikSCAT and METOP-A) in order to identify and register a complete index of all storm observations. Users with a focus on extreme wind events can now access through Naiad this extensive catalogue which spans over more than 17 years. This work was supported by ESA, as part of the enhancement of the legacy of ERS missions.