Skip to main content
U.S. flag

An official website of the United States government

An assessment of African test sites in the context of a global network of quality-assured reference standards

January 1, 2009

The Committee on Earth Observation Satellites (CEOS) Infrared and Visible Optical Sensors (IVOS) subgroup members established a set of CEOS-endorsed globally distributed reference standard test sites for the postlaunch calibration of space-based optical imaging sensors. This paper discusses the top five African pseudo-invariant sites (Libya 4, Mauritania 1/2, Algeria 3, Libya 1, and Algeria 5) that were identified by the IVOS subgroup. This paper focuses on monitoring the long-term radiometric stability of the Terra Moderate Resolution Imaging Spectroradiometer (MODIS) and the Landsat 7 (L7) Enhanced Thematic Mapper Plus (ETM+) sensors using near-simultaneous and cloud-free image pairs acquired from launch to December 2008 over the five African desert sites. Residual errors and coefficients of determination were also generated to support the quality assessment of the calibration differences between the two sensors. An effort was also made to evaluate the relative stability of these sites for long-term monitoring of the optical sensors. ??2009 IEEE.

Citation Information

Publication Year 2009
Title An assessment of African test sites in the context of a global network of quality-assured reference standards
DOI 10.1109/IGARSS.2009.5417687
Authors G. Chander, X. Xiong, A. Angal, T. Choi
Publication Type Conference Paper
Publication Subtype Conference Paper
Series Title
Series Number
Index ID 70035400
Record Source USGS Publications Warehouse
USGS Organization Earth Resources Observation and Science (EROS) Center