SPOT6 Avalanche outlines 24 January 2018

Outlines of 18'737 avalanches mapped from SPOT6 satellite data over the Swiss Alps on 24 January 2018. The outlines have different attributes described in the data example key (ExampleKey_AvalMapping.pdf)

The generation of the data is described in:

Bühler, Y., E. D. Hafner, B. Zweifel, M. Zesiger, and H. Heisig (2019), Where are the avalanches? Rapid SPOT6 satellite data acquisition to map an extreme avalanche period over the Swiss Alps, The Cryosphere, 13(12), 3225-3238, doi:10.5194/tc-13-3225-2019.

Abstract. Accurate and timely information on avalanche occurrence are key for avalanche warning, crisis management and avalanche documentation. Today such information is mainly available at isolated locations provided by observers in the field. The achieved reliability considering accuracy, completeness and reliability of the reported avalanche events is limited. In this study we present the spatial continuous mapping of a large avalanche period in January 2018 covering the majority of the Swiss Alps (12’500 km2).

We tested different satellite sensors available for rapid mapping during a first avalanche period. Based on these experiences, we tasked SPOT6/7 data for data acquisition to cover the second, much larger avalanche period. We manually mapped the outlines of 18’737 individual avalanche events, applying image enhancement techniques to analyze regions in cast shadow as well as brightly illuminated ones. The resulting dataset of mapped avalanche outlines, having a unique completeness and reliability, is evaluated to produce maps of avalanche occurrence and avalanche size. We validated the mapping of the avalanche outlines using photographs acquired from helicopters just after the avalanche period.

This study demonstrates the applicability of optical, very high spatial resolution satellite data to map an exceptional avalanche period with very high completeness, accuracy and reliability over a large region. The generated avalanche data is of great value to validate avalanche bulletins, complete existing avalanche databases and for research applications by enabling meaningful statistics on important avalanche parameters.

Koordinate System: CH1903+ LV95 LN02

Data and Resources

Additional Info

Field Value
Source
Version 1.0
Author [{"affiliation": "SLF", "affiliation_02": "", "affiliation_03": "", "data_credit": ["collection", "validation", "publication"], "email": "[email protected]", "given_name": "Elisabeth", "identifier": "", "name": "Hafner"}, {"affiliation": "SLF", "affiliation_02": "", "affiliation_03": "", "data_credit": ["validation", "curation", "publication", "supervision"], "email": "[email protected]", "given_name": "Yves", "identifier": "0000-0002-0815-2717", "name": "B\u00fchler"}]
Author Email
Maintainer {"affiliation": "SLF", "email": "[email protected]", "given_name": "Yves", "identifier": "0000-0002-0815-2717", "name": "Bühler"}
Maintainer Email
Shared (this field will be removed in the future) Open
IB1 Sensitivity Class
IB1 Trust Framework
IB1 Dataset Assurance
IB1 Trust Framework
dora_link
harvest_object_id 231a4c6e-456d-4d34-9b79-983a99892dff
harvest_source_id 8fc5dcf9-738c-468f-985c-d55347a92f88
harvest_source_title EnviDat