DOI: 10.5194/tc-14-1409-2020
论文题名: Towards a webcam-based snow cover monitoring network: Methodology and evaluation
作者: Portenier C. ; Hüsler F. ; Härer S. ; Wunderle S.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 4 起始页码: 1409
结束页码: 1423
语种: 英语
英文关键词: climate effect
; digital elevation model
; environmental monitoring
; Internet
; mapping method
; methodology
; parameter estimation
; photography
; snow cover
; Alps
; Switzerland
英文摘要: Snow cover variability has a significant impact on climate and the environment and is of great socioeconomic importance for the European Alps. Terrestrial photography offers a high potential to monitor snow cover variability, but its application is often limited to small catchment scales. Here, we present a semiautomatic procedure to derive snow cover maps from publicly available webcam images in the Swiss Alps and propose a procedure for the georectification and snow classification of such images. In order to avoid the effort of manually setting ground control points (GCPs) for each webcam, we implement a novel registration approach that automatically resolves camera parameters (camera orientation; principal point; field of view, FOV) by using an estimate of the webcams' positions and a high-resolution digital elevation model (DEM). Furthermore, we propose an automatic image-to-image alignment to correct small changes in camera orientation and compare and analyze two recent snow classification methods. The resulting snow cover maps indicate whether a DEM grid is snow-covered, snow-free, or not visible from webcams' positions. GCPs are used to evaluate our novel automatic image registration approach. The evaluation reveals a root mean square error (RMSE) of 14.1 m for standard lens webcams (FOV<48 ĝˆ ) and a RMSE of 36.3 m for wide-angle lens webcams (FOV≥48 ĝˆ ). In addition, we discuss projection uncertainties caused by the mapping of low-resolution webcam images onto the high-resolution DEM. Overall, our results highlight the potential of our method to build up a webcam-based snow cover monitoring network. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164561
Appears in Collections: 气候变化与战略
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作者单位: Institute of Geography and Oeschger, Centre for Climate Change Research, University of Bern, Bern, Switzerland; Federal Office for the Environment (FOEN), Ittigen, Switzerland; Professorship Ecoclimatology, Technical University of Munich, Freising, Germany
Recommended Citation:
Portenier C.,Hüsler F.,Härer S.,et al. Towards a webcam-based snow cover monitoring network: Methodology and evaluation[J]. Cryosphere,2020-01-01,14(4)