Libya 2
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The Libya 2 Pseudo Invariant Calibration Site (PICS) is located in the Sahara Desert in Africa. Spatial homogeneity for the site, which is one of the important aspects of desert site selection criteria for satellite calibration, is about 3 percent for the Near Infrared and Red spectral region of this site, meeting threshold requirements [1]. The site was identified and analyzed by Cosnefroy et, al. [2] based on spatial uniformity. Moreover, temporal stability, cloud coverage, and average monthly precipitation, fulfilled the criteria for being considered as PICS.
Libya 2 has been used in calibration stability monitoring for different radiometers [3]. The Libya 2 site has usability in cross-calibration of different satellite sensors, including Landsat 8 OLI and Sentinel-2A MSI [4].
Closest Aerosol Robotic Network (AERONET) station = El_Farafra [ 27.06°, 27.99°].
| Location (City, State, Country): |
Libya, Africa
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|---|---|
| Landsat WRS - 2 Path / Row: |
182-183/43
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| Center Latitude (degrees): |
N 25.05
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| Center Longitude (degrees): |
E 20.48
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| CEOS Region of Interest |
N 25.05, E 20.48 Search this area in EarthExplorer (Landsat 8-9 Collection 2 Level-1) - date range, datasets, cloud cover and other criteria can be modified once initial results are returned |
| Size of Usable Area (km): |
100 x 100
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| UTM Zone: |
34
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| Altitude above sea level (meters): |
329
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| Purpose: |
Radiometry
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| Status: |
Active
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- Lacherade, Sophie, Bertrand Fougnie, Patrice Henry, and Philippe Gamet. "Cross calibration over desert sites: Description, methodology, and operational implementation." IEEE Transactions on Geoscience and Remote Sensing 51, no. 3 (2013): 1098-1113.
- Cosnefroy, Helene, Marc Leroy, and Xavier Briottet. "Selection and characterization of Saharan and Arabian desert sites for the calibration of optical satellite sensors." Remote Sensing of Environment 58, no. 1 (1996): 101-114.
- Smith, Dave L., Chris T. Mutlow, and CR Nagaraja Rao. "Calibration monitoring of the visible and near-infrared channels of the Along-Track Scanning Radiometer-2 by use of stable terrestrial sites." Applied optics 41, no. 3 (2002): 515-523.
- Pinto, Cibele Teixeira, Mahesh Shrestha, Nahid Hasan, Larry Leigh, and Dennis Helder. "SBAF for cross-calibration of Landsat-8 OLI and Sentinel-2 MSI over North African PICS." In Earth Observing Systems XXIII, vol. 10764, p. 107640Y. International Society for Optics and Photonics, 2018.
Note: This information has been compiled by the USGS ECCOE Team, using the best sources currently known. Updates will be made as more information becomes available. Please contact eccoe@usgs.gov with any updates you would like to contribute.