RadCalNet
The RADiometric CALibration NETwork
Portail de données
Product
Development, maintenance and updates of the RadCalnet portal for ESA
Skills
Radiometry, calibration
Date
From 2013 to today
The RadCalNet portal
RadCalNet is an initiative of the Working Group on Calibration and Validation of the Committee on Earth Observation Satellites. The RadCalNet service provides satellite operators with SI-traceable Top-of-Atmosphere (TOA) spectral resolution reflectances. This facilitates post-launch radiometric calibration and validation of optical imaging sensor data.
The open access service provides a continuously updated archive of TOA reflectances derived over a network of sites, with associated uncertainties. These are collected at a spectral sampling interval of 10 nm, in the spectral range 380 nm to 2500 nm and at 30 minute intervals. Each individual site is equipped with automated ground-based instruments. These instruments provide continuous measurements of surface reflectance and local environmental/atmospheric conditions necessary to derive TOA reflectance values. The TOA reflectances, provided on this portal, are derived from the surface and atmospheric measurements of the individual sites. This is made possible by using a common method via a central processing system.
Each member site takes responsibility for the quality of the surface and atmospheric measurements provided. Also, each member is subject to rigorous peer review and comparison. These checks ensure consistency from site to site and traceability of the SI.
Web interface of the RadCAlNet tool
The Earth Observation Unit is in charge of the development, maintenance and evolution of the portal. We have participated in many space missions in the framework of RadCalnet: Pleiades HR 1 & 2, CALIPSO, Sentinel-2A & 2B, CSO-1,2 (3 soon), METOP-C/IASI-C, PARASOL, Venms, Megha-Tropiques, Pleiades Neo.
We have been awarded a label of excellence by CNES for our expertise in this field.
The portal provides access to all RadCalNet data sets, allowing users to view and download data acquired by the four instrumented reference test sites.
The portal can be accessed on the website RadCalNet.
What we do :
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- development, maintenance and evolution of the portal
- in-orbit calibration of space-based sensors
- a dedicated acquisition plan
- a set of geometric and radiometric calibration parameters to be downloaded on board
- a configuration of the image processing chain on the ground
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The RadCalNet portal currently has :
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- 521 users including :
- representatives of national space agencies
- private operators of optical
- space sensors
universities
- 2014 days available for calibration since March 2013
- 521 users including :
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Key partner
ESA
Key words
calibration, radiometry, portal, sensor, space, optical, reflectance, CEOS
SCIENCE FOR EARTH CARE
The Earth Observation Unit of Magellium is an expert in optical space missions and geophysical and biophysical applications. The EO unit provides high level of expertise and full capacity on the whole processing chain, enabling it to respond to all projects from the greatest space orders such as ESA and CNES.