Description:

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.

Links:

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Temporal Extent:

Start: 1973-01-15T00:00:00.000Z

Spatial Extent:

Minimum Bounding Rectangle: 23.44 12.19 25.76 14.83

USGS_LTA Short Name: CEOS_CalVal_Test_Site-Libya1 Version ID: Not provided Unique ID: C1220566868-USGS_LTA

Description:

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): Mauritania 2 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.

Links:

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• undefined

Temporal Extent:

Start: 1972-09-26T00:00:00.000Z

Spatial Extent:

Minimum Bounding Rectangle: 18.92 -10.42 22.67 -7.52

USGS_LTA Short Name: CEOS_CalVal_Test_Sites-Mauritania2 Version ID: Not provided Unique ID: C1220566953-USGS_LTA

Description:

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. Instrumented Sites: Tuz Golu, Turkey is one of eight instrumented sites that are CEOS Reference Test Sites. The CEOS instrumented sites are provisionally being called LANDNET. These instrumented sites are primarily used for field campaigns to obtain radiometric gain, and these sites can serve as a focus for international efforts, facilitating traceability and inter-comparison to evaluate biases of in-flight and future instruments in a harmonized manner.  In the longer-term it is anticipated that these sites will all be fully automated and provide surface and atmospheric measurements to the WWW in an autonomous manner reducing some of the cost of a manned campaign, at present three can operate in this manner.

Links:

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Temporal Extent:

Start: 1972-10-06T00:00:00.000Z

Spatial Extent:

Minimum Bounding Rectangle: 37.69 30.69 40 35.79

USGS_LTA Short Name: CEOS_CalVal_Test_Site-Tuz_Golu-Turkey Version ID: Not provided Unique ID: C1220567092-USGS_LTA

Description:

The National Environment Research Council (NERC) Satellite Station at Dundee University (UK) server address on the WWW is 'http://www.sat.dundee.ac.uk/'. The Natural Environment Research Council, established by Royal Charter in 1965, has responsibility for planning, encouraging and carrying out research in the physical and biological sciences which explain the natural processes of the environment. The NERC satellite station at Dundee University has been systematically recording HRPT data from NOAA satellites on a daily basis since the launch of the prototype 3rd generation NOAA satellite TIROS-N in October 1978. It also recorded data from the CZCS on NIMBUS-7 between August 1979 and the end of the mission in December 1986. SeaWiFS, NIMBUS-7's replacement was launched on 1st August 1997 and Dundee is receiving and archiving this data. MODIS data from EOS AM/PM satellites (Terra, Aqua) will also be archived. HRPT data is stored on magnetic tape and optical disk and is available from Dundee for all NOAA satellite passes from 1978 onwards. Formats include raw data on exabytes and CD-ROMs, processed images, high quality enhanced photographic enlargments, photographic browse files etc. Data is also available over the network from the web site. The quicklook archive contains sampled images from every NOAA satellite pass received at Dundee. The images are sampled to contain the complete pass in each of the 5 AVHRR channels plus a Normalized Difference Vegetation Index. The images are also corrected for earth curvature and have a grid overlay showing coastlines and latitude/longitude lines. Browsing the archive to search for specific areas or features is made easier with access to our database of all passes we have received. Thumbnail images allow those with slow network connections to view a series of small images for quick comparisons or when searching for major features.

Links:

• Metadata link
• Metadata link
• DUNDEE_UK

Temporal Extent:

Start: 1978-01-01T00:00:00.000Z

Spatial Extent:

Minimum Bounding Rectangle: 20 -100 80 90

SCIOPS Short Name: DUNDEE_UK Version ID: Not provided Unique ID: C1214585542-SCIOPS