CEOS Cal Val Test Site - Algeria 3 - Pseudo-Invariant Calibration Site (PICS)Entry ID: CEOS_CalVal_Test_Sites-Algeria3
Abstract: On the background of these requirements for sensor calibration, intercalibration and product validation, the subgroup on Calibration and Validation of the Committee on Earth Observing System (CEOS) formulated the following recommendation during the plenary session held in China at the end of 2004, with the goal of setting-up and operating an internet based system to provide sensor data, protocols ... and guidelines for these purposes:
Reference Datasets are required to support the understanding of climate change and quality assure operational services by Earth Observing satellites. The data from different sensors and the resulting synergistic data products require a high level of accuracy that can only be obtained through continuous traceable calibration and validation activities.
Initiate an activity to document a reference methodology to predict Top of Atmosphere (TOA) radiance for which currently flying and planned wide swath sensors can be intercompared, i.e. define a standard for traceability. Also create and maintain a fully accessible web page containing, on an instrument basis, links to all instrument characteristics needed for intercomparisons as specified above, ideally in a common format. In addition, create and maintain a database (e.g. SADE) of instrument data for specific vicarious calibration sites, including site characteristics, in a common format. Each agency is responsible for providing data for their instruments in this common format. Recommendation : The required activities described above should be supported for an implementation period of two years and a maintenance period over two subsequent years. The CEOS should encourage a member agency to accept the lead role in supporting this activity. CEOS should request all member agencies to support this activity by providing appropriate information and data in a timely manner.
Pseudo-Invariant Calibration Sites (PICS):
Algeria 3 is one of six CEOS reference Pseudo-Invariant Calibration Sites (PICS) that are CEOS Reference Test Sites. Besides the nominally good site characteristics (temporal stability, uniformity, homogeneity, etc.), these six PICS were selected by also taking into account their heritage and the large number of datasets from multiple instruments that already existed in the EO archives and the long history of characterization performed over these sites. The PICS have high reflectance and are usually made up of sand dunes with climatologically low aerosol loading and practically no vegetation. Consequently, these PICS can be used to evaluate the long-term stability of instrument and facilitate inter-comparison of multiple instruments.
Purpose: To facilitate and coordinate calibration and validation data over the Algeria 3 test site.
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Start Date: 1972-08-11
Quality The 'version 004' or 'collection 004' product is better than 'version
001' and earlier versions. The quality of this version 004 product is
... established as 'Validated' . This means its accuracy has
been estimated using a small number of independent measurements
obtained from selected locations and time periods and ground-truth/field
program efforts. Product images look reasonable when compared to other
spaceborne instruments or comparable data in limited situations. Scientific
use should be performed with caution with careful reference to QA
statements provided with each product.
Access Constraints Available to public to gain familiarity with the data format and
Use Constraints This Data set (version 004/collection 004) is of 'Validated'
Quality. This data is appropriate for use in scientific publications.
Before using it in any publication please the contact science team
representative for the known problems and updates.
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DIF Creation Date: 2003-04-03
Last DIF Revision Date: 2010-09-22