气候变化领域集成服务门户(CCPortal): High-accuracy UAV photogrammetry of ice sheet dynamics with no ground control

CCPortal

DOI	10.5194/tc-13-955-2019
	High-accuracy UAV photogrammetry of ice sheet dynamics with no ground control
	Chudley T.R.; Christoffersen P.; Doyle S.H.; Abellan A.; Snooke N.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	955
结束页码	968
卷号	13 期号:3
英文摘要	Unmanned aerial vehicles (UAVs) and structure from motion with multi-view stereo (SfM-MVS) photogrammetry are increasingly common tools for geoscience applications, but final product accuracy can be significantly diminished in the absence of a dense and well-distributed network of ground control points (GCPs). This is problematic in inaccessible or hazardous field environments, including highly crevassed glaciers, where implementing suitable GCP networks would be logistically difficult if not impossible. To overcome this challenge, we present an alternative geolocation approach known as GNSS-supported aerial triangulation (GNSS-AT). Here, an on-board carrier-phase GNSS receiver is used to determine the location of photo acquisitions using kinematic differential carrier-phase positioning. The camera positions can be used as the geospatial input to the photogrammetry process. We describe the implementation of this method in a low-cost, custom-built UAV and apply the method in a glaciological setting at Store Glacier in western Greenland. We validate the technique at the calving front, achieving topographic uncertainties of ±0.12m horizontally (∼ 1:1× the ground sampling distance) and ±0:14 m vertically (∼ 1:3× the ground sampling distance), when flying at an altitude of ∼ 450 m above ground level. This compares favourably with previous GCP-derived uncertainties in glacial environments and allows us to apply the SfM-MVS photogrammetry at an inland study site where ice flows at 2 m day-1 and stable ground control is not available. Here, we were able to produce, without the use of GCPs, the first UAV-derived velocity fields of an ice sheet interior. Given the growing use of UAVs and SfM-MVS in glaciology and the geosciences, GNSS-AT will be of interest to those wishing to use UAV photogrammetry to obtain highprecision measurements of topographic change in contexts where GCP collection is logistically constrained. © 2019 The Author(s).
学科领域	accuracy assessment; aerial triangulation; detection method; equipment; glaciology; GNSS; ground control; ice sheet; measurement method; photogrammetry; sampling; uncertainty analysis; unmanned vehicle; Arctic; Greenland; Store Glacier
语种	英语
scopus关键词	accuracy assessment; aerial triangulation; detection method; equipment; glaciology; GNSS; ground control; ice sheet; measurement method; photogrammetry; sampling; uncertainty analysis; unmanned vehicle; Arctic; Greenland; Store Glacier
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118907
作者单位	Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom; Centre for Glaciology, Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom; Institute of Applied Geoscience, School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Department of Computer Science, Aberystwyth University, Aberystwyth, United Kingdom
推荐引用方式 GB/T 7714	Chudley T.R.,Christoffersen P.,Doyle S.H.,et al. High-accuracy UAV photogrammetry of ice sheet dynamics with no ground control[J],2019,13(3).
APA	Chudley T.R.,Christoffersen P.,Doyle S.H.,Abellan A.,&Snooke N..(2019).High-accuracy UAV photogrammetry of ice sheet dynamics with no ground control.The Cryosphere,13(3).
MLA	Chudley T.R.,et al."High-accuracy UAV photogrammetry of ice sheet dynamics with no ground control".The Cryosphere 13.3(2019).