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Generation and Validation of High‐Resolution DEMs from Worldview‐2 Stereo Data
Author(s) -
Sefercik Umut G.,
Alkan Mehmet,
Buyuksalih Gurcan,
Jacobsen Karsten
Publication year - 2013
Publication title -
the photogrammetric record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.638
H-Index - 51
eISSN - 1477-9730
pISSN - 0031-868X
DOI - 10.1111/phor.12038
Subject(s) - panchromatic film , standard deviation , nadir , digital elevation model , remote sensing , photogrammetry , ground sample distance , multispectral image , scale (ratio) , lidar , satellite , elevation (ballistics) , geodesy , geology , geography , pixel , cartography , computer science , mathematics , artificial intelligence , statistics , geometry , physics , astronomy
WorldView‐2 ( WV ‐2), whose panchromatic images have a 0·5 m ground sampling distance ( GSD ), was launched by DigitalGlobe in 2009. It is the first commercial satellite to offer 8‐band multispectral imagery with 1·8 m resolution. Due to the off‐nadir sensor rotation of WV ‐2, it is feasible to obtain stereo coverage. Digital elevation models ( DEM s) 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 1·0 GSD . A higher number of discrepancies larger than 4 m exist than would be expected from a normal distribution, influencing the standard deviation more than the normalised median absolute deviation ( NMAD ) .