气候变化领域集成服务门户(CCPortal): Terrain changes from images acquired on opportunistic flights by SfM photogrammetry

CCPortal

DOI	10.5194/tc-11-827-2017
	Terrain changes from images acquired on opportunistic flights by SfM photogrammetry
	Girod L.; Nuth C.; Kaäb A.; Etzelmüller B.; Kohler J.
发表日期	2017
ISSN	19940416
卷号	11 期号:2
英文摘要	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. © 2017 The Author(s).
学科领域	accuracy assessment; channel flow; equipment; glacier mass balance; GNSS; image analysis; photogrammetry; precision; remote sensing; satellite imagery; terrain; Arctic; Svalbard; Svalbard and Jan Mayen
语种	英语
scopus关键词	accuracy assessment; channel flow; equipment; glacier mass balance; GNSS; image analysis; photogrammetry; precision; remote sensing; satellite imagery; terrain; Arctic; Svalbard; Svalbard and Jan Mayen
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119420
作者单位	Department of Geosciences, University of Oslo, Postboks 1047 Blindern, Oslo, 0316, Norway; Norwegian Polar Institute, Framsenteret, Hjalmar Johansens gate 14, Tromsø, 9296, Norway
推荐引用方式 GB/T 7714	Girod L.,Nuth C.,Kaäb A.,et al. Terrain changes from images acquired on opportunistic flights by SfM photogrammetry[J],2017,11(2).
APA	Girod L.,Nuth C.,Kaäb A.,Etzelmüller B.,&Kohler J..(2017).Terrain changes from images acquired on opportunistic flights by SfM photogrammetry.Cryosphere,11(2).
MLA	Girod L.,et al."Terrain changes from images acquired on opportunistic flights by SfM photogrammetry".Cryosphere 11.2(2017).