|GBOV (Ground-Based Observations for Validation), as part of the Copernicus Global Land Service (see below), aims at facilitating the use of observations from operational ground-based monitoring networks and their comparison to Earth Observation products through the following objectives:
1. Collection of multi-year ground-based observations of high relevance for the understanding of land surface processes from existing global networks. This ground-based observations (Reference Measurements;RMs) will be collected over a series of selected sites organized through international research networks (such as SurfRad, AERONET, FluxNet, NEON, ARM, BSRN, TERN, OZFlux, USRCN …). Please, click here to access more details on the list of RMs available. In the the first stage of the project, about 50 core validation sites will be considered.
2. Upgrade of existing sites with new instrumentation or establishing entirely new monitoring sites to close thematic or geographic gaps. This part of the project will be implemented in a second phase.
3.Implementation and maintenance of a database for the distribution of reference measurements (RMs) and the corresponding Land Products (LPs). The focus of GBOV is on providing the information required for in depth quality assessment of the products offered through the global component of the Copernicus Land Monitoring Service (CLMS), i.e. the Copernicus Global Land Service (CGLS).
|Copernicus is the European Union’s Earth Observation and Monitoring program, delivering free access to operational data and information services in a wide range of application areas. To be of real use in environmental monitoring and decision-making, it is essential to ensure that satellite-derived products such as offered through Copernicus are of high quality and consistency. By comparison with the corresponding in situ observations, their quality can be better understood, facilitating sensible and meaningful application.
Over the last decades, operational ground-based monitoring sites have been established as part of wider thematic observation networks, providing a wealth of information highly relevant for validation and quality assurance purposes. However, the practical use of the such gained in situ observations is hampered by a number of issues such as access restrictions, insufficient standardization, inconsistent quality, or lack of spatial or temporal coverage.
About GBOV data access
Yes, you have to register and login in order to download GBOV products on this page (http://data.gbov.acri.fr/index.php?action=dataaccessLP) and this page (http://data.gbov.acri.fr/index.php?action=dataaccessRM)
You can read the GBOV data policy here : http://data.gbov.acri.fr/public/docs/GBOV_Data_Policy_v1.2.pdf
This policy must be read and accept before downloading GBOV products.
About GBOV products
The GBOV service shall primarily allow the quality control of the main land products CGLS products (top-of-canopy reflectances, surface albedo, fAPAR, LAI, fCover, LST and soil moisture) providing collections of multiple years of ground-based RMs and derived land Products (LPs). Obviously, the information offered through GBOV may also be used for a wide range of applications beyond the CGLS.
The RMs products are delivered in a .CSV file and a metadata .TXT file.
The LP1, LP2, LP6 and LP7 are delivered in .CSV format with the relative .TXT metadata file.
The LP3, LP4 and LP5 are delivered as .TIF images with the associated .TXT readme file and a .TXT metafile.
For more information about the products format and content, please refer to the section 4 of the Product User Manual (available in the Products page).