Leibniz University Hannover, Institute of Photogrammetry and GeoInformation, Nienburger Straße 1, 30167 Hannover, Germany
Caraga State University, Caraga Center for Geo-Informatics & Department of Geodetic Engineering, College of Engineering and Geosciences, Ampayon, 8600 Butuan City, Philippines
Christian Heipke
Leibniz University Hannover, Institute of Photogrammetry and GeoInformation, Nienburger Straße 1, 30167 Hannover, Germany