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Surface Geometry, Thickness Changes and Flow Fields on Creeping Mountain Permafrost: Automatic Extraction by Digital Image Analysis

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  • A. Kääb
  • M. Vollmer

Abstract

Aerial photogrammetry is an established tool for area‐wide mapping and monitoring of permafrost geometry, thickness changes and surface creep. This study applies commercial software for the automatic generation of elevation models from digital imagery and presents a newly developed tool for digital measurement of surface displacements from repeated orthophotos. The accuracy and quality of automatically‐derived geometry and velocity data are compared to conventionally‐derived elevation and velocity data from the Muragl rock glacier in the Swiss Alps. The analysis reveals that for thickness changes and velocities digital photogrammetry provides at least the same accuracy as the reference data. Under unfavourable terrain and image conditions, such as steep slopes, shadows or snow cover, the reliability of the automatically‐derived data is significantly lower than the operator‐measured ones. Copyright © 2000 John Wiley & Sons, Ltd. La photogrammétrie aérienne est un outil reconnu pour cartographier et suivre l'évolution du pergélisol, et spécialement pour déterminer les changements d'épaisseur et la vitesse du creep en surface. La présente étude s'intéresse aux programmes automatiques mesurant l'altitude à partir d'images digitales; elle présente ce nouvel outil pour connaître les déplacements de surface en comparant des orthophotos prises à différents moments. La précision et la qualité des données automatiquement obtenues sont comparées avcc les mesures d'altitude et de vitesse obtenues de la manière habituelle pour le glacier rocheux Muragl dans les Alpes suisses. L'analyse révèle que la photogrammétrie digitale donne au moins la même précision que les données de référence. Sous des conditions de terrain et d'image défavorables telles que des pentes fortes, des zones à l'ombre ou sous couverture neigeuse, la fiabilité des données obtenues automatiquement est significativement inférieure à celles obtenues par un opérateur. Copyright © 2000 John Wiley & Sons, Ltd.

Suggested Citation

  • A. Kääb & M. Vollmer, 2000. "Surface Geometry, Thickness Changes and Flow Fields on Creeping Mountain Permafrost: Automatic Extraction by Digital Image Analysis," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 11(4), pages 315-326, December.
    • Handle: RePEc:wly:perpro:v:11:y:2000:i:4:p:315-326
    DOI: 10.1002/1099-1530(200012)11:43.0.CO;2-J
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    Cited by:

    1. Atanu Bhattacharya & Kriti Mukherjee & Manoj Kuri & Malte Vöge & M. Sharma & M. Arora & Rejinder Bhasin, 2015. "Potential of SAR intensity tracking technique to estimate displacement rate in a landslide-prone area in Haridwar region, India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 79(3), pages 2101-2121, December.
    2. Alessandro Cicoira & Marco Marcer & Isabelle Gärtner‐Roer & Xavier Bodin & Lukas U. Arenson & Andreas Vieli, 2021. "A general theory of rock glacier creep based on in‐situ and remote sensing observations," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 32(1), pages 139-153, January.

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