High-Resolution Digital Elevation Models of Chamoli Ice-Debris Flow Landscape

2-meter resolution digital elevation models depict topography affected by the February 2021 avalanche-debris flow in Chamoli, India. The data were created from CNES/Airbus Pléiades-HR stereo satellite imagery to support landscape change analysis and numerical modeling with CAESAR-Lisflood. These raster datasets are designed for import and analysis within GIS software.

Use Cases

• Analyze landscape change and erosion patterns from the 2021 event using high-resolution elevation data in GIS.
• Support numerical modeling of debris flow dynamics and terrain impacts with CAESAR-Lisflood using the DEMs.
• Calculate volumetric changes in the affected Himalayan terrain by comparing pre- and post-event elevation models.
• Map flow paths and deposition zones of the ice-debris flow using the 2-meter resolution topographic data.

Strengths

• Provides very high 2-meter spatial resolution for detailed topographic analysis.
• Derived from CNES/Airbus Pléiades-HR stereo satellite imagery, a high-quality source.
• Specifically created to study a significant, dated geohazard event (7 February 2021).

Limitations

• Limited temporal coverage focused on a single event, lacking time-series data for longitudinal study.
• Spatial coverage is restricted to the specific area affected by the Chamoli event.
• Data format and size require specialized GIS software for analysis, limiting accessibility for non-geospatial users.

Provenance

Source

Environmental Information Data Centre

Collection Method

Created from CNES/Airbus Pléiades-HR stereo satellite imagery captured in along-track mode.

Time Range

Related to the event of 7 February 2021.

Freshness

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Geography

Chamoli District, Uttarakhand, India, in the Himalaya region.