Libya 3
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The Libya 3 site is located within the Sahara Desert in Africa. As a desert site, less spatial and temporal variation is expected, minimal cloud coverage is observed, and changes caused by human activity are negligible. The spatial homogeneity of Libya 3 for a 100 x 100 kilometer (km) area has been characterized by Medium Resolution Imaging Spectrometer (MERIS) measurements [1]. In the observation, it was found that for the Red and NIR spectral bands, the standard deviation from mean TOA reflectance was 3.8 percent and 4.7 percent for the Blue band. These values are slightly higher than the threshold (3 percent) set for site selection as defined by Cosnefroy et al. (1996) [2].
Libya 3 has been considered for long-term sensor performance monitoring because of its stability. The site has also been used in the cross-calibration of medium-resolution sensors such as MERIS, Moderate Resolution Imaging Spectroradiometer (MODIS), and Polarization and Anisotropy of Reflectances for Atmospheric Science coupled with Observations from a Lidar (PARASOL) [1].
Closest AERONET station = El_Farafra [ 27.06°, 27.99°]
| Location (City, State, Country): |
Libya, Africa
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|---|---|
| Landsat WRS - 2 Path / Row: |
181/44
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| Center Latitude (degrees): |
N 23.15
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| Center Longitude (degrees): |
E 23.10
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| CEOS Region of Interest |
N 23.15, E 23.10 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): |
587
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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.
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.