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- Title
Multitemporal Structure-from-Motion: A Flexible Tool to Cope with Aerial Blocks in Changing Mountain Environment.
- Authors
Genzano, Nicola; Fugazza, Davide; Eskandari, Rasoul; Scaioni, Marco
- Abstract
The application of <em>Structure-from-Motion</em> (SfM) and <em>Multi-View-Stereo matching</em> with aerial images can be successfully used for deriving dense point clouds to analyse changes in the mountain environment, which is characterized by changes due to the action of natural process. The comparison of multiple datasets requires to setup a stable reference system, task that is generally implemented by means of ground control points (GCPs). On the other hand, their positioning may be sometimes difficult in mountains. To cope with this drawback an approach termed as <em>Multitemporal SfM</em> (MSfM) is presented: multiple blocks are oriented together within a unique SfM project, where GCPs are used in only one epoch for establishing the absolute datum. Accurate coregistration between different epochs depends on the automatic extraction of tie points in stable areas. To verify the application of MSfM in real cases, this paper presents three case studies where different types of photogrammetric data are adopted, including images from drones and manned aircrafts. Applications to glacier and mountain river erosion are entailed.
- Subjects
DRONE aircraft; MULTIPLE comparisons (Statistics); POINT cloud; ALPINE glaciers; DIGITAL photogrammetry; DRONE surveillance; EROSION; GLACIERS
- Publication
International Archives of the Photogrammetry, Remote Sensing & Spatial Information Sciences, 2024, Vol 48, Issue 2, p99
- ISSN
1682-1750
- Publication type
Article
- DOI
10.5194/isprs-archives-XLVIII-2-2024-99-2024