Abstract

Since 1984 the Committee on Earth Observation Satellites (CEOS) Working Group on Calibration and Validation (WGCV) has acted as a forum for international co-operation for calibration and validation activities. WGCV has two objectives. These are “sensor-specific calibration and validation”, and “geophysical parameter and derived product validation”. Calibration is defined by WGCV as the process of quantitatively defining the system response to known, controlled signal inputs, and validation is the process of assessing by independent means the quality of the data products derived from the system outputs. International co-operation underpins this work and is at the heart of a new CEOS initiative, the Integrated Global Observing Strategy (IGOS). The IGOS objectives are to derive greater benefit from earth observing systems, to identify gaps in current system planning, to increase the range of Earth observation applications and improve the integration of global observation activities. With the advent of the IGOS, WGCV has embarked on a new three-year work plan. The main elements of improving co-ordination and communication and implementation of validation activities are described in this paper.

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