GENERATION AND VALIDATION OF HIGH-RESOLUTION DEMS FROM WORLDVIEW-2 STEREO DATA
U. G. Sefercik, Mehmet Alkan, G Büyüksalih, Karsten Jacobsen
article (Uluslararası, Hakemli) | Yazar(lar): U. G. Sefercik, Mehmet Alkan, G Büyüksalih, Karsten Jacobsen | Yıl: 2013 | Dergi/Kurum: PHOTOGRAMMETRIC RECORD | İndeks: WOS.SCI | DOI: 10.1111/phor.12038 | Anahtar Kelimeler: DEM generation, high resolution, optical stereoscopy, quality evaluation, validation, WorldView-2
WorldView-2 (WV-2), whose panchromatic images have a 0<bold></bold>5m ground sampling distance (GSD), was launched by DigitalGlobe in 2009. It is the first commercial satellite to offer 8-band multispectral imagery with 1<bold></bold>8m resolution. Due to the off-nadir sensor rotation of WV-2, it is feasible to obtain stereo coverage. Digital elevation models (DEMs) have been created with three WV-2 stereopairs of northern Istanbul with different land types and one of these is comprehensively analysed in this study. A reference DEM, developed from large-scale aerial photogrammetric mapping, together with a lidar DEM and an overlapping neighbouring WV-2 DEM, are used for validation. The generated WV-2 DEM reached, after filtering and in open areas, a standard deviation in height of approximately 1<bold></bold>0 GSD. A higher number of discrepancies larger than 4m exist than would be expected from a normal distribution, influencing the standard deviation more than the normalised median absolute deviation (NMAD).