Global Change Master Directory (GCMD)

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CEOS Cal Val Test Site - Libya 1 - Pseudo-Invariant Calibration Site (PICS)

Entry ID: CEOS_CalVal_Test_Site-Libya1

Summary

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:

Background:

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.
Requirement:

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):
Libya 4 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 Libya 4 test site.

Related URL

Link: View Related Information

Description: Committee on Earth Observation Satellites (CEOS) Working Group on Calibration and Validation (WGCV) Test Sites.

Geographic Coverage

Spatial coordinates

N: 25.76

S: 23.44

E: 14.83

W: 12.19

Data Set Citation

Version: Not provided

Temporal Coverage

Start Date: 1973-01-15

Location Keywords

CONTINENT > AFRICA > NORTHERN AFRICA > LIBYA

Science Keywords

LAND SURFACE > SURFACE THERMAL PROPERTIES

LAND SURFACE > LAND USE/LAND COVER

LAND SURFACE > SURFACE RADIATIVE PROPERTIES > REFLECTANCE

SPECTRAL/ENGINEERING > SENSOR CHARACTERISTICS

Platform

ENVISAT > Environmental Satellite

ERS-1 > European Remote Sensing Satellite-1

Instrument

AATSR > Advanced Along-Track Scanning Radiometer

ATSR > Along Track Scanning Radiometer and Microwave Sounder

Project

CWIC > CEOS WGISS Integrated Catalog

Access Constraints No restrictions.

Use Constraints None.

Data Center

Earth Resources Observation and Science Center, U.S. Geological Survey, U.S. Department of the Interior

Data Center URL: https://www.usgs.gov/centers/eros

Data Center Personnel
Name: GREG STENSAAS Phone: 605-594-2569 Fax: 605-594-6906 Email: stensaas at usgs.gov Contact Address: U.S. Geological Survey, 47914-252nd Street City: Sioux Falls Province or State: SD Postal Code: 57198 Country: USA

Extended Metadata Properties

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Creation and Review Dates

DIF Creation Date: 2012-09-12

Last DIF Revision Date: 2019-03-25

Reformat as ISO 19115 document

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