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Qaid, Ali M. and Basavarajappa, H. T. and Rajendran, S. and Ashfaq, S. A. and Xu, Junfeng (2009) Calibration of ASTER and ETM + imagery using empirical line method-a case study of north-east of Hajjah, Yemen. Geo-spatial Information Science, 12 (3). pp. 197-201. ISSN 1993-5153