气候变化领域集成服务门户(CCPortal): Repeat mapping of snow depth across an alpine catchment with RPAS photogrammetry

CCPortal

DOI	10.5194/tc-12-3477-2018
	Repeat mapping of snow depth across an alpine catchment with RPAS photogrammetry
	Redpath T.A.N.; Sirguey P.; Cullen N.J.
发表日期	2018
ISSN	19940416
卷号	12 期号:11
英文摘要	Being dynamic in time and space, seasonal snow represents a difficult target for ongoing in situ measurement and characterisation. Improved understanding and modelling of the seasonal snowpack requires mapping snow depth at fine spatial resolution. The potential of remotely piloted aircraft system (RPAS) photogrammetry to resolve spatial variability of snow depth is evaluated within an alpine catchment of the Pisa Range, New Zealand. Digital surface models (DSMs) at 0.15m spatial resolution in autumn (snow-free reference) winter (2 August 2016) and spring (10 September 2016) allowed mapping of snow depth via DSM differencing. The consistency and accuracy of the RPAS-derived surface was assessed by the propagation of check point residuals from the aero-triangulation of constituent DSMs and via comparison of snow-free regions of the spring and autumn DSMs. The accuracy of RPAS-derived snow depth was validated with in situ snow probe measurements. Results for snow-free areas between DSMs acquired in autumn and spring demonstrate repeatability yet also reveal that elevation errors follow a distribution that substantially departs from a normal distribution, symptomatic of the influence of DSM co-registration and terrain characteristics on vertical uncertainty. Error propagation saw snow depth mapped with an accuracy of ±0:08m (90% c.l.). This is lower than the characterization of uncertainties on snow-free areas (±0:14 m). Comparisons between RPAS and in situ snow depth measurements confirm this level of performance of RPAS photogrammetry while also highlighting the influence of vegetation on snow depth uncertainty and bias. Semi-variogram analysis revealed that the RPAS outperformed systematic in situ measurements in resolving fine-scale spatial variability. Despite limitations accompanying RPAS photogrammetry, which are relevant to similar applications of surface and volume change analysis, this study demonstrates a repeatable means of accurately mapping snow depth for an entire, yet relatively small, hydrological catchment (∼0:4 km2) at very high resolution. Resolving snowpack features associated with redistribution and preferential accumulation and ablation, snow depth maps provide geostatistically robust insights into seasonal snow processes, with unprecedented detail. Such data will enhance understanding of physical processes controlling spatial distributions of seasonal snow and their relative importance on varying spatial and temporal scales. © Author(s) 2018.
学科领域	alpine environment; catchment; in situ measurement; in situ test; photogrammetry; probe; seasonal variation; snowpack; spatial resolution; spatial variation; spatiotemporal analysis; vegetation cover; volume change; New Zealand
语种	英语
scopus关键词	alpine environment; catchment; in situ measurement; in situ test; photogrammetry; probe; seasonal variation; snowpack; spatial resolution; spatial variation; spatiotemporal analysis; vegetation cover; volume change; New Zealand
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/119038
作者单位	Department of Geography, University of Otago, Dunedin, 9016, New Zealand; National School of Surveying, University of Otago, Dunedin, 9016, New Zealand
推荐引用方式 GB/T 7714	Redpath T.A.N.,Sirguey P.,Cullen N.J.. Repeat mapping of snow depth across an alpine catchment with RPAS photogrammetry[J],2018,12(11).
APA	Redpath T.A.N.,Sirguey P.,&Cullen N.J..(2018).Repeat mapping of snow depth across an alpine catchment with RPAS photogrammetry.Cryosphere,12(11).
MLA	Redpath T.A.N.,et al."Repeat mapping of snow depth across an alpine catchment with RPAS photogrammetry".Cryosphere 12.11(2018).