Algeria 3
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The Algeria 3 Pseudo Invariant Calibration Site (PICS) is a recommended test site by the Committee on Earth Observation Satellites (CEOS) Working Group for Calibration and Validation (WGCV) Infrared and Visible Optical Sensors (IVOS). The PICS site selection criteria, such as temporal stability, spatial homogeneity, high reflectance, very low directional effects, stable atmospheric conditions, etc., have been fulfilled by this site. This site has also been investigated by Cosnefroy et al. (1996) based on the level of temporal stability and spatial uniformity at various sizes and scales. A field experiment in Saharan Algeria has also been conducted by Cosnefroy et al. (1997) to better characterize and validate the sites usability for optical satellite calibration works [1].
Algeria 3 is located in the Sahara Desert, in the eastern part of Oriental Erg, which is composed of dunes having a pyramidal shape, 100 meters (m) high, randomly disposed, with a slope ranging from 15 to 30 degrees. The distance between two successive dunes varies from 1 to 2 km [1].
Algeria 3 is being used for long-term stability monitoring of different low to medium resolution satellite sensors, such as the Terra Moderate Resolution Imaging Spectroradiometer (MODIS), the Landsat 7 Enhanced Thematic Mapper Plus (ETM+), and the Landsat 8 Operational Land Imager (OLI) [2]. It is also being used for cross-calibration and comparison work of different satellite sensors [3].
| Location (City, State, Country): |
Algeria, Africa
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| Landsat WRS - 2 Path / Row: |
192/39
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| Center Latitude (degrees): |
N 30.32
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| Center Longitude (degrees): |
E 7.66
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| CEOS Region of Interest |
N 30.77, E 7.21 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 KML showing CEOS region of interest (Need help with this file?) |
| CNES Region of Interest |
N 30.42, E 7.56 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 KML file showing CNES region of interest (Need help with this file?) |
| UTM Zone: |
32
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| Altitude above sea level (meters): |
245
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| Purpose: |
Radiometry
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| Status: |
Active
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- Cosnefroy, H., X. Briottet, M. Leroy, P. Lecomte, and R. Santer. "A field experiment in Saharan Algeria for the calibration of optical satellite sensors." International Journal of Remote Sensing 18, no. 16 (1997): 3337-3359.
- Chander, Gyanesh, Xiaoxiong Jack Xiong, Taeyoung Jason Choi, and Amit Angal. "Monitoring on-orbit calibration stability of the Terra MODIS and Landsat 7 ETM+ sensors using pseudo-invariant test sites." Remote Sensing of Environment 114, no. 4 (2010): 925-939.
- Barsi, Julia A., Bahjat Alhammoud, Jeffrey Czapla-Myers, Ferran Gascon, Md Obaidul Haque, Morakot Kaewmanee, Larry Leigh, and Brian L. Markham. "Sentinel-2A MSI and Landsat-8 OLI radiometric cross comparison over desert sites." European Journal of Remote Sensing 51, no. 1 (2018): 822-837.
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.