{"id":"f5394eaa-5ccb-4cf7-9ee4-c057c35b8517","uri":"https://catalogue.ceh.ac.uk/id/f5394eaa-5ccb-4cf7-9ee4-c057c35b8517","type":"dataset","title":"High-resolution (2 metre) digital elevation models of difference showing surface change following the Chamoli ice-debris flow, India, February 2021","description":"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. \n\nThe data also supported numerical modelling using CAESAR-Lisflood (see related data https://catalogue.ceh.ac.uk/documents/7023cb77-c797-475e-872c-6f1e2b63dcc1). They are most commonly imported into GIS software, where they can be analysed or support other forms of geospatial analysis.","metadataDate":"2026-03-25T16:53:38","resourceIdentifiers":[{"code":"https://catalogue.ceh.ac.uk/id/f5394eaa-5ccb-4cf7-9ee4-c057c35b8517"},{"code":"10.5285/f5394eaa-5ccb-4cf7-9ee4-c057c35b8517","codeSpace":"doi:"}],"relationships":[{"relation":"http://purl.org/dc/terms/isPartOf","target":"7023cb77-c797-475e-872c-6f1e2b63dcc1"}],"lineage":"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).","spatialRepresentationTypes":["grid"],"topicCategories":[{"value":"elevation","uri":"http://inspire.ec.europa.eu/metadata-codelist/TopicCategory/elevation"}],"keywordsPlace":[{"value":"Himalaya"},{"value":"Uttarākhand","uri":"http://sws.geonames.org/1444366"},{"value":"Chamoli","uri":"http://sws.geonames.org/1274839"}],"keywordsOther":[{"value":"Digital elevation model"},{"value":"Change detection"},{"value":"Topographic reconstruction"},{"value":"remote sensing","uri":"http://www.eionet.europa.eu/gemet/concept/7102"},{"value":"digital land model","uri":"http://www.eionet.europa.eu/gemet/concept/2195"}],"distributionFormats":[{"name":"TIFF","type":"image/tiff","version":"unknown"},{"name":"Shapefile","version":"unknown"}],"spatialResolutions":[{"distance":"2"}],"funding":[{"funderName":"Natural Environment Research Council","funderIdentifier":"https://ror.org/02b5d8509","awardNumber":"NE/W002930/1","orcid":false,"ror":true}],"boundingBoxes":[{"westBoundLongitude":79.471,"eastBoundLongitude":79.764,"southBoundLatitude":30.471,"northBoundLatitude":30.595,"bounds":"{\"type\": \"Feature\",      \"properties\": {},      \"geometry\": {        \"type\": \"Polygon\",        \"coordinates\": [[[79.471, 30.471], [79.471, 30.595], [79.764, 30.595], [79.764, 30.471], [79.471, 30.471]]]      }}","coordinates":"[[[79.471, 30.471], [79.471, 30.595], [79.764, 30.595], [79.764, 30.471], [79.471, 30.471]]]"}],"distributorContacts":[{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"distributor","email":"info@eidc.ac.uk"}],"responsibleParties":[{"familyName":"Westoby","givenName":"M.","organisationName":"Northumbria University","organisationIdentifier":"https://ror.org/049e6bc10","role":"author","email":"matt.westoby@plymouth.ac.uk","nameIdentifier":"https://orcid.org/0000-0002-2070-5580","fullName":"Westoby, M."},{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"custodian","email":"info@eidc.ac.uk"},{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"publisher","email":"info@eidc.ac.uk"},{"familyName":"Westoby","givenName":"M.","organisationName":"Northumbria University","organisationIdentifier":"https://ror.org/049e6bc10","role":"pointOfContact","email":"matt.westoby@plymouth.ac.uk","nameIdentifier":"https://orcid.org/0000-0002-2070-5580","fullName":"Westoby, M.","pointOfContact":"Northumbria University"},{"organisationName":"Northumbria University","organisationIdentifier":"https://ror.org/049e6bc10","role":"rightsHolder"}],"temporalExtents":[{"begin":"2021-02-01","end":"2022-01-01"}],"onlineResources":[{"url":"https://catalogue.ceh.ac.uk/datastore/eidchub/f5394eaa-5ccb-4cf7-9ee4-c057c35b8517","name":"Download the data","description":"Download a copy of this data","function":"fileAccess","size":"2796000","type":"OTHER"},{"url":"https://data-package.ceh.ac.uk/sd/f5394eaa-5ccb-4cf7-9ee4-c057c35b8517.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this 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