IANIGLA   20881
INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
artículos
Título:
?Detecting Glacier Surface Motion by Optical Flow
Autor/es:
LENZANO M. G.; LENZANO LUIS; LANNUTTI, E; RIVERA ANDRES; TOTH, C; LENZANO M. G.; LENZANO LUIS; LANNUTTI, E; RIVERA ANDRES; TOTH, C
Revista:
PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING
Editorial:
AMER SOC PHOTOGRAMMETRY
Referencias:
Año: 2018 vol. 84 p. 33 - 42
ISSN:
0099-1112
Resumen:
In this study, we assessed the feasibility of using optical flow, in particular, large displacement optical flow (LDOF) method as a possible solution to obtain surface movement data to derive ice flow velocities in a glacier. Tests were carried out at the Viedma Glacier, located at the South Patagonia Icefield, Argentina, where terrestrial monoscopic image sequences were acquired by a calibrated camera from April 2014 until April 2016. As for preprocessing, the Correlated Analysis method was implemented to avoid and minimize errors due to the measurable changes in lighting, shadows, clouds, and snow. The results show a flow field with a maximum surface velocity value of 3.5 m/d. The errors were minimized by averaging the image sequence results based on seasons, in which the Total Error Reconstruction yielded fairly good mean accuracy (0.36 m/d). In summary, it was demonstrated that LDOF can provide accurate and robust solution to detect daily changes in the glacier surface.