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CEOS Cal Val Test Site - Algeria 3 - Pseudo-Invariant Calibration Site (PICS)

Entry ID: CEOS_CalVal_Test_Sites-Algeria3

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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):
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.

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: 31.36

S: 29.09

E: 10.01

W: 5.22

Temporal Coverage

Start Date: 1972-08-11

Location Keywords

CONTINENT > AFRICA > NORTHERN AFRICA > ALGERIA

Science Keywords

LAND SURFACE > LAND TEMPERATURE

LAND SURFACE > LAND USE/LAND COVER

ISO Topic Category

ENVIRONMENT

GEOSCIENTIFIC INFORMATION

INLAND WATERS

Access Constraints None

Use Constraints The version of RF1 used to compile ERF1 was an early edition of a USGS RF1
translation and was recently updated by EPA (1996). The capability of the
enhanced version of RF1 (ERF1) and the current EPA version has not been
evaluated. The user is referred to the EPA version [see Web address given in
the USEPA (1996) reference] for discussions of streamflow accuracy and general
background on the origin of RF1.

Ancillary Keywords

GIS

Network

Data Set Progress

COMPLETE

Originating Center

USGS

Data Center

Water Resources Maps and GIS Information, Water Resources Division, U.S. Geological Survey, U.S. Department of the Interior

Data Center URL: http://water.usgs.gov/lookup/getgislist

Data Center Personnel
Name: WATER WEBSERVER TEAM - USGS Phone: 703-648-4000;1-800-426-9000 Email: h2oteam at usgs.gov Contact Address: USGS National Center Water Resources Division 12201 Sunrise Valley Drive City: Reston Province or State: VA Postal Code: 20192-0002 Country: USA

Distribution

Distribution Format: Open Geospatial Consortium Web Map Service (WMS)

Fees: Contact Data Center

Distribution Format: Shapefile

Fees: Contact Data Center

Personnel

PAULA DUNBAR

Role: TECHNICAL CONTACT

Role: DIF AUTHOR

Phone: 303-497-6084

Fax: 303-497-6513

Email: Paula.Dunbar at noaa.gov

Contact Address:

NOAA/NESDIS/NGDC E/GC1 325 Broadway

City: Boulder

Province or State: CO

Postal Code: 80305-3328

Country: USA

Creation and Review Dates

DIF Creation Date: 2010-05-13

Last DIF Revision Date: 2011-03-10

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