High-resolution (2 metre) digital elevation models of difference showing surface change following the Chamoli ice-debris flow, India, February 2021

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This dataset is available under the terms of the Open Government Licence

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https://doi.org/10.5285/f5394eaa-5ccb-4cf7-9ee4-c057c35b8517

These data are digital elevation models (DEMs) of difference (DoD). They are a geospatial dataset created in raster (.tif) format and quantify vertical (z) topographic change between two dates. The data were created to support analysis of landscape change following the 7th February 2021 avalanche-debris flow in Chamoli District, Uttarakhand, India. The data also supported numerical modelling using CAESAR-Lisflood (see related data collection). They are most commonly imported into GIS software, where they can be analysed or support other forms of geospatial analysis.

Publication date: 2023-12-15

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More information

View numbers valid from 15 December 2023 Download numbers valid from 20 June 2024 (information prior to this was not collected)

Formats

TIFF, Shapefile

Spatial information

Study area

Spatial representation type

Raster

Spatial reference system

WGS 84

Temporal information

Temporal extent

2021-02-01 to 2022-01-01

Provenance & quality

The DEMs from which these DoDs were created are available in the related data collection. The DoDs were created in QGIS software (versions 3.18 and 3.24) using the Raster Calculator tool. For a given DEM pair, the later DEM was subtracted from the earlier DEM to create a DoD. In this way, minus values show surface lowering (e.g. erosion), and positive values show surface gain (e.g. deposition). Where holes/data gaps existed in the input DEMs, these are reproduced in the subsequent DoD. (These holes occur where photogrammetric reconstruction failed due to poor key-point or tie-point extraction due to cloud cover, topographic occlusion, or because of a large offset between the view angle of the two satellite image acquisitions, for example).

Licensing and constraints

This dataset is available under the terms of the Open Government Licence

Cite this dataset as:

Westoby, M. (2023). High-resolution (2 metre) digital elevation models of difference showing surface change following the Chamoli ice-debris flow, India, February 2021. NERC EDS Environmental Information Data Centre. https://doi.org/10.5285/f5394eaa-5ccb-4cf7-9ee4-c057c35b8517

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