@article{Sadeq_2012,
title={EVALUATION OF ASTER GDEM v.2 USING GPS CHECKPOINTS,
OSGB DEM VALUES AND PHOTOGAMMETRICALLY DERIVED DEMS},
volume={XXXIX-B4},
ISSN={2194-9034},
url={http://dx.doi.org/10.5194/isprsarchives-xxxix-b4-295-2012},
DOI={10.5194/isprsarchives-xxxix-b4-295-2012},
journal={The International Archives of the Photogrammetry,
Remote Sensing and Spatial Information Sciences},
publisher={Copernicus GmbH},
author={Sadeq,
H. and Drummond,
J. and Li,
Z.},
year={2012},
month=jul,
pages={295–300} }