Avalanche Size Estimates and Outlines from Survey and Orthophoto Data

A dataset supporting a reliability study for avalanche size estimates and outlines, containing survey results from 170 participants and avalanche mappings from 10 participants. It includes orthophotos at four resolutions (2m, 1m, 50cm, 25cm) and outlines for six specific avalanches. The data was collected by ENVIDAT, with acquisition partially supported by the Swiss National Science Foundation, and was last updated in 2023.

Use Cases

• Assess inter-rater reliability by comparing the avalanche outlines mapped by 10 participants for the six avalanche photographs.
• Validate remote sensing techniques by analyzing avalanche mappings from five participants across orthophotos of four different resolutions (2m, 1m, 50cm, 25cm).
• Study human perception in hazard assessment using the survey results from 170 participants who estimated avalanche sizes from 10 pictures.
• Separate terrain analysis using the provided shade masks to investigate mapping accuracy in illuminated versus shaded areas of the orthophotos.
• Define a study area for geospatial analysis using the provided Area of Interest (AoI) delimiting the research region.

Strengths

• Survey data from 170 participants provides a substantial sample for analyzing human estimation variance.
• Orthophoto data is available at four distinct spatial resolutions (2m, 1m, 50cm, 25cm) for comparative analysis.
• Includes reference avalanche outlines mapped from georeferenced photographs for validation purposes.

Limitations

• The core dataset focuses on only six specific avalanche events, limiting generalizability.
• The exact number of rows, total file size, and specific column structure for tabular survey data are unknown.
• The dataset's primary purpose is a methodological reliability study, not a broad catalog of avalanche events.

Provenance

Source

ENVIDAT, with orthophoto acquisition partially supported by the Swiss National Science Foundation (Grant N°200021_172800).

Collection Method

Data collected via participant surveys and manual mapping of avalanche outlines from oblique photographs and multi-resolution orthophotos.

Freshness

Last updated in 2023.

Geography

Research area is defined by a provided Area of Interest (AoI); specific location is not stated but implied to be in a region relevant to the supporting Swiss grant.