Chamoli Disaster Post-event 2-m DEM Composite

A 2-meter resolution Digital Elevation Model (DEM) composite was created from satellite imagery acquired on February 10-11, 2021, covering areas affected by the February 7, 2021 Chamoli disaster. The dataset combines five cross-track stereo DEMs from Maxar/DigitalGlobe WorldView-2, WorldView-3, and GeoEye-1 images and one in-track stereo DEM from Pléiades-HR1B images. It provides a continuous post-event terrain model for analyzing geomorphic changes, with heights referenced to the WGS84 ellipsoid in UTM 44N projection.

Use Cases

• [Glacier and landslide volume change analysis] based on [difference maps with a pre-event DEM composite]
• [High-resolution topographic mapping] based on [2-meter posted DEMs from multiple satellite sources]
• [Validation of stereo photogrammetry pipelines] based on [processing details using NASA Ames Stereo Pipeline and co-registration methods]
• [Geomorphic change detection] based on [continuous DEM coverage of primary affected areas]

Strengths

• [High spatial resolution] based on [2-meter posting for the primary composite]
• [Multi-source data fusion] based on [combination of 5 cross-track stereo DEMs and 1 in-track stereo DEM from different satellite platforms]
• [Rigorous co-registration] based on [alignment to a pre-event DEM using glacier and snow masks]
• [Open access availability] based on [license listed as Open Access (green) across all sources]

Limitations

• [Metadata completeness] based on [unknown row count, file size, and specific last updated date across all sources]
• [Potential geometric inconsistencies] based on [description of one cross-track DEM requiring planar correction due to poor stereo geometry]
• [Limited temporal scope] based on [coverage focused on a two-day post-event period in February 2021]

Provenance

Source

University of Washington (UW team) and CNRS team

Collection Method

Processed from Maxar/DigitalGlobe (WorldView-2, WorldView-3, GeoEye-1) and Pléiades-HR1B satellite imagery using NASA Ames Stereo Pipeline.

Time Range

February 10-11, 2021

Geography

Chamoli disaster affected area, UTM zone 44N