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Terrain changes from images acquired on opportunistic flights by SfM photogrammetry

The cryosphere, 2017-03, Vol.11 (2), p.827-840

COPYRIGHT 2017 Copernicus GmbH ;2017. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;info:eu-repo/semantics/openAccess ;ISSN: 1994-0424 ;ISSN: 1994-0416 ;EISSN: 1994-0424 ;DOI: 10.5194/tc-11-827-2017

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Title:
Terrain changes from images acquired on opportunistic flights by SfM photogrammetry
Author: Girod, Luc ; Nuth, Christopher ; Kääb, Andreas ; Etzelmüller, Bernd ; Kohler, Jack
Subjects: Accuracy ; Aircraft ; Algorithms ; Aquaporins ; Cameras ; Channels ; Clocks ; Clocks & watches ; Cost analysis ; Data ; Data acquisition ; Data collection ; Data processing ; Elevation ; Equipment costs ; Fieldwork ; Geomorphological research ; Geomorphology ; Glacial drift ; Glaciers ; Global navigation satellite system ; Helicopters ; Image acquisition ; Imagery ; Landslides ; Mass balance ; Metadata ; Methods ; Moraines ; Navigation ; Navigation satellites ; Navigation systems ; Navigational satellites ; Photogrammetry ; Polls & surveys ; Surveying ; Surveys ; Temporal resolution ; Thermokarst
Is Part Of: The cryosphere, 2017-03, Vol.11 (2), p.827-840
Description: Acquiring data to analyse change in topography is often a costly endeavour requiring either extensive, potentially risky, fieldwork and/or expensive equipment or commercial data. Bringing the cost down while keeping the precision and accuracy has been a focus in geoscience in recent years. Structure from motion (SfM) photogrammetric techniques are emerging as powerful tools for surveying, with modern algorithm and large computing power allowing for the production of accurate and detailed data from low-cost, informal surveys. The high spatial and temporal resolution permits the monitoring of geomorphological features undergoing relatively rapid change, such as glaciers, moraines, or landslides. We present a method that takes advantage of light-transport flights conducting other missions to opportunistically collect imagery for geomorphological analysis. We test and validate an approach in which we attach a consumer-grade camera and a simple code-based Global Navigation Satellite System (GNSS) receiver to a helicopter to collect data when the flight path covers an area of interest. Our method is based and builds upon Welty et al. (2013), showing the ability to link GNSS data to images without a complex physical or electronic link, even with imprecise camera clocks and irregular time lapses. As a proof of concept, we conducted two test surveys, in September 2014 and 2015, over the glacier Midtre Lovénbreen and its forefield, in northwestern Svalbard. We were able to derive elevation change estimates comparable to in situ mass balance stake measurements. The accuracy and precision of our DEMs allow detection and analysis of a number of processes in the proglacial area, including the presence of thermokarst and the evolution of water channels.
Publisher: Katlenburg-Lindau: Copernicus GmbH
Language: English;Norwegian
Identifier: ISSN: 1994-0424
ISSN: 1994-0416
EISSN: 1994-0424
DOI: 10.5194/tc-11-827-2017
Source: Geneva Foundation Free Medical Journals at publisher websites
NORA Norwegian Open Research Archives
Directory of Open Access Journals
ROAD: Directory of Open Access Scholarly Resources
ProQuest Central

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Terrain changes from images acquired on opportunistic flights by SfM photogrammetry

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