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CEOS Cal Val Test Site - Libya 4 - Pseudo-Invariant Calibration Site (PICS)

Entry ID: CEOS_CalVal_Test_Site-Libya4

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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 PROJECT HOME PAGE

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

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: 28.65

S: 28.45

E: 23.5

W: 23.3

Temporal Coverage

Start Date: 1972-11-16

Location Keywords

CONTINENT > AFRICA > NORTHERN AFRICA > LIBYA

Data Resolution

Latitude Resolution: 1.1 km - 17.6 km
Longitude Resolution: 1.1 km - 17.6 km
Horizontal Resolution Range: 10 km - < 50 km or approximately .09 degree - < .5 degree
Temporal Resolution: about 15 orbits/day
Temporal Resolution Range: Daily - < Weekly

Science Keywords

ATMOSPHERE > AEROSOLS > AEROSOL EXTINCTION

ATMOSPHERE > AEROSOLS > AEROSOL PARTICLE PROPERTIES

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

ENVIRONMENT

Platform

TERRA > Earth Observing System, TERRA (AM-1)

Instrument

Cameras

MISR > Multi-Angle Imaging SpectroRadiometer

Project

EOSDIS > Earth Observing System Data Information System

ESIP > Earth Science Information Partners Program

MISR > Multi-angle Imaging SpectroRadiometer

CWIC > CEOS WGISS Integrated Catalog

Ancillary Keywords

COLUMN AEROSOL OPTICAL DEPTH

OPTICAL DEPTH

Data Center

Atmospheric Science Data Center, Science Directorate, Langley Research Center, NASA

Data Center URL: http://eosweb.larc.nasa.gov/
Dataset ID: MISR Level 2 Aerosol parameters V002

Data Center Personnel
Name: ASDC USER SERVICES Phone: 757-864-8656 Email: larc-asdc-uds at lists.nasa.gov Contact Address: NASA Langley Atmospheric Science Data Center User and Data Services NASA Langley Research Center Mail Stop 157D City: Hampton Province or State: VA Postal Code: 23681-2199 Country: USA