Resumé
Geological outcrops can be comfortably modelled in three dimensions in
the office using images from a handheld digital camera. Recent
developments within the imaging techniques of Structure from Motion
(Lowe 2004; Snavely et al. 2008; Fonstad et al. 2013) and photogrammetry (Hirschmüller 2005; James & Robson 2012; Favalli et al.
2012) have made it easier and cheaper to construct so-called digital
outcrop models using stereoscopic images from standard digital cameras.
The digital outcrop model (Bellian et al. 2005) is a 3D
representation of the outcrop surface and is often displayed in the form
of a polygon mesh or a point cloud. In this paper we present three
examples of such point clouds from images obtained with a handheld
digital camera. The examples illustrate how outcrop topography or
digital outcrop models can be constructed at different scales, with
different accessibility and operational platforms. Two examples
illustrate outcrop scales of metres to kilometres, with images obtained
by walking along excavated exposures in the Faxe limestone quarry and
from a boat sailing past the coastal cliff of Stevns Klint. The third
example illustrates detailed micro-topography of ice and snow surfaces
where the images were obtained from a snowmobile on an ice cap in A.P.
Olsen Land, North-East Greenland.
Originalsprog | Engelsk |
---|---|
Sider (fra-til) | 73–76 |
Antal sider | 4 |
Tidsskrift | Geological Survey of Denmark and Greenland Bulletin |
Vol/bind | 33 |
DOI | |
Status | Udgivet - 7 jul. 2015 |
Programområde
- Programområde 4: Mineralske råstoffer