期刊名称：Geological Survey of Denmark and Greenland Bulletin
印刷版ISSN：1604-8156
出版年度：2015
卷号：33
页码：73-76
语种：English
出版社：De Nationale Geologiske Undersoegelser for Danmark og Groenland
摘要：Geological outcrops can be comfortably modelled in threedimensions in the ofce using images from a handheld digitalcamera. Recent developments within the imaging techniquesof Structure from Motion (Lowe 2004; Snavely et al. 2008;Fonstad et al. 2013) and photogrammetry (Hirschmüller2005; James & Robson 2012; Favalli et al. 2012) have madeit easier and cheaper to construct so-called digital outcropmodels using stereoscopic images from standard digital cameras. Te digital outcrop model (Bellian et al. 2005) is a 3Drepresentation of the outcrop surface and is ofen displayedin the form of a polygon mesh or a point cloud. In this paperwe present three examples of such point clouds from imagesobtained with a handheld digital camera. Te examples illustrate how outcrop topography or digital outcrop models canbe constructed at different scales, with different accessibilityand operational platforms. Two examples illustrate outcrop scales of metres to kilometres, with images obtained by walking along excavated exposures in the Faxe limestone quarryand from a boat sailing past the coastal cliff of Stevns Klint.Te third example illustrates detailed micro-topography ofice and snow surfaces where the images were obtained froma snowmobile on an ice cap in A.P. Olsen Land, North-EastGreenland.
