c40e5a40-4d41-4f40-a937-fc43f5e6b507 eng; CAN Polar Data Catalogue Canadian Cryospheric Information Network (519) 888-4567 x32689 200 University Avenue West, University of Waterloo Waterloo Ontario N2L 3G1 Canada pdc@uwaterloo.ca 2022-04-08T13:00:26 North American Profile of ISO 19115:2003 2009-01-01 https://www.polardata.ca/pdcsearch/PDCSearchDOI.jsp?doi_id=1896 Belcher Glacier surface and bedrock digital elevation models and ice thickness map 2012-06-08 Jeffrey Kavanaugh W.R. Clavano Clavano, W.R. and J. Kavanaugh, Belcher Glacier surface and bedrock digital elevation models and ice thickness map, Canadian IPY/GLACIODYN, 2012. Improved surface and bedrock DEMs have been produced for the Belcher Glacier using data from different sources, including in situ measurements, airborne soundings, and satellite images. Surface elevation is based on 2007 (late summer) SPOT5 HRS images. Bed elevation values are derived from surface-based ground penetrating radar soundings conducted during the 2007 and 2008 summer field seasons. Airborne radar surveys in 2000 and 2005 by the Scott Polar Research Institute and the Center for Remote Sensing of Ice Sheets, respectively, provide ice thickness data. By subtracting ice thickness from surface elevation using the surface DEM, bedrock elevation values are derived. Additional bedrock elevation data for the seafloor in front of the terminus of Belcher Glacier were obtained from a bathymetric survey in 2006 by workers from Memorial University of Newfoundland and the University of New Brunswick working off the CCGS Amundsen. A 40-m grid is used as a map base. Bed elevation values were found for each point on the grid by applying a kernel that weighted values of surrounding points by distance. After finding a suitable semivariogram model, statistical interpolation (kriging) was performed to fill in the rest of the grid points to produce the bedrock DEM. As a check, a 1999 Landsat panchromatic image was used to force bedrock elevation to equal surface elevation within the boundaries of rock outcrops and thus ensure that ice thickness is zero throughout. Digital elevation models (DEMs) for the surface and bedrock topography of the Belcher Glacier have been developed using SPOT5 HRS and Landsat 7 ETM+ images, bathymetric information, and airborne and surface-based ground penetrating radar soundings with coincident GPS surface elevation records. An ice thickness map has also been produced from the DEMs. These will be used in mass balance studies, ice dynamics modelling, and hydrologic modelling. Additional information can be found at the following link: http://people.uleth.ca/~sarah.boon/IPY_page/dems.html Polar Data Catalogue Canadian Cryospheric Information Network (519) 888-4567 x32689 200 University Avenue West, University of Waterloo Waterloo Ontario N2L 3G1 Canada pdc@uwaterloo.ca polardata.ca http https://metadata.arice-h2020.eu/geonetwork/srv/api/records/c40e5a40-4d41-4f40-a937-fc43f5e6b507/attachments/map.png Bedrock Climate change Devon Island Glaciers GPS Ground penetrating radar Ice Images Statistics Surface Polar Data Catalogue Thesaurus (Canada) 2021-06-02 Canadian Cryospheric Information Network (519) 888-4567 x32689 200 University Avenue West, University of Waterloo Waterloo Ontario N2L 3G1 Canada pdc@uwaterloo.ca polardata.ca http https://www.polardata.ca/pdcinput/public/keywordlibrary Belcher Glacier, Devon Island, Nunavut, Canada Terms of Use of the Polar Data Catalogue: https://www.polardata.ca/pdcinput/public/termsofuse eng; CAN environment -81.59 -80.88 75.3 75.77 Time period can be either covered by the content of the dataset or the date when the data has been collected. 2007-11-01 2009-10-31 Summary: Surface and bedrock elevation and ice thickness are provided for the Belcher Glacier in a 40-m grid. Full coverage of the entire drainage area is available for surface elevation. The bedrock digital elevation model (DEM) covers the main trunk of the glacier as well as its three main (with strong ice surface velocities) tributaries. Measurements from in situ GPS records (not differentially corrected) and satellite altimetry (ICESat) agree well with surface elevation values (to within about 15 meters). Bed elevation values from processed radargrams of GPR surveys have depth-dependent uncertainties that increase to a maximum of 9 m for an ice thickness of 800 m, assuming that the correct bedrock reflection horizon is tracked. Signals vanish at estimated thicknesses beyond 600 m. However, using the airborne data, ice thicknesses greater than 600 m have been observed. Errors in these areas will depend on the interpretation of valley shape by manually connecting visible horizons. These errors can be as much as 100 m (but can vary by 300 m between different interpreters). Reliable checks for valley shape continuity have been the rock outcrop elevations from the SPOT DEM, boundaries of which have been produced from processing a 1999 Landsat panchromatic image mosaic. Uncertainties in the interpolation results increase with increasing distance from an input point. The resulting product of this work includes SPIRIT program material copyright CNES 2009 and SPOT Image 2007, all rights reserved. Research Program(s): IPY. For further information: martin.sharp@ualberta.ca false Digital file 1.0 Polar Data Catalogue Canadian Cryospheric Information Network (519) 888-4567 x32689 200 University Avenue West, University of Waterloo Waterloo Ontario N2L 3G1 Canada pdc@uwaterloo.ca This metadata was generated from the PDC metadata database at 2021-06-02 Polar Data Catalogue Canadian Cryospheric Information Network (519) 888-4567 x32689 200 University Avenue West, University of Waterloo Waterloo Ontario N2L 3G1 Canada pdc@uwaterloo.ca