This dataset contains the data used and collected to investigate the reliability of avalanche size estimates and avalanche outlines (see related publications). Namely this is

• the 10 pictures depicting avalanches
• the survey results from the 170 participants

• the pictures of the six avalanches
• the avalanche outlines mapped by the 10 participants
• the reference mapped from the georeferenced photographs

• the orthophotos in the four different resolutions (2m, 1m, 50cm, 25cm)
• the area of interest (AoI) delimiting the research area
• the avalanche mappings in each resolution for all five participants
• the shade masks used to separate illuminated and shaded areas

The acquisition of the orthophotos has been partially supported by the Swiss National Science Foundation (SNF; Grant N°200021_172800).