--- cited_by: [] datasets: - access_dt: ~ attributes: ~ cite_metadata: ~ data_qualifier: ~ description: 'This data set provides a digital elevation model (DEM) for Antarctica to 81.5 degrees south latitude, at a resolution of 5 km. Approximately twenty million data points were used to generate this data set. Data points were derived from ERS-1 radar altimetry during the geodetic phase from March 1994 to May 1995. The improved density in coverage and resolution, compared with past satellite altimetry missions, provides better detection of topographic detail such as surface undulations, ice streams, grounding zones, and interstream ridges. DEM data are in a polar stereographic projection with the origin at the south pole, and are referenced to the OSU91A geoid. The ERS-1 satellite radar altimeter measurements are highly useful for determining precise ice sheet elevations in Antarctica. The orthometric heights derived from the ERS-1 data contribute to a more accurate and complete mapping of the Antarctic Ice Sheets than previously possible, and therefore to ongoing studies of ice mass balance studies in Antarctica. The DEM is provided as a single ASCII text file, accessible by ftp. Data access is unrestricted, but we recommend that users register with us. Registered users automatically receive e-mail notification of product updates and changes to processing.' description_attribution: http://nsidc.org/data/dems/index.html display_name: Antarctic 5-km Digital Elevation Model from ERS-1 Altimetry doi: 10.5067/BZVCEDZWUTCH end_time: 1995-05-31T00:00:00 identifier: nasa-nsidcdaac-0076 lat_max: -65 lat_min: -81 lon_max: 180 lon_min: -180 name: Antarctic 5-km Digital Elevation Model from ERS-1 Altimetry native_id: NSIDC-0076 processing_level: ~ publication_year: ~ release_dt: 2000-01-01T00:00:00 scale: ~ scope: ~ spatial_extent: ~ spatial_ref_sys: ~ spatial_res: ~ start_time: 1994-03-01T00:00:00 temporal_extent: ~ temporal_resolution: ~ type: dataset uri: /dataset/nasa-nsidcdaac-0076 url: http://nsidc.org/data/NSIDC-0076 variables: ~ version: ~ vertical_extent: ~ - access_dt: ~ attributes: ~ cite_metadata: ~ data_qualifier: ~ description: 'A Digital Elevation Model (DEM), ice thickness grid, and bedrock elevation grid of Greenland acquired as part of the PARCA program are available in ASCII text format at a 5 km grid spacing in a polar stereographic projection. DEM data are a combination of ERS-1 and Geosat satellite radar altimetry data, Airborne Topographic Mapper (ATM) data, and photogrammetric digital height data. Ice thickness data are based on approximately 700,000 data points collected in the 1990s from a University of Kansas airborne ice penetrating radar (IPR). Nearly 30,000 data points were collected in the 1970s from a Technical University of Denmark (TUD) airborne echo sounder. Bamber subtracted the ice thickness grid from the DEM to produce a grid of bedrock elevation values. Applications include studies of gravitational driving stress and ice volume (mass balance) of the Greenland Ice Sheet. Each of the three grids is approximately 1.5 MB. Data are available via FTP. Data access is unrestricted, but we recommend that users register with us. Registered users automatically receive e-mail notification of product updates and changes to processing.' description_attribution: http://nsidc.org/data/dems/index.html display_name: 'Greenland 5 km DEM, Ice Thickness, and Bedrock Elevation Grids' doi: 10.5067/01A10Z9BM7KP end_time: 1970-12-01T00:00:00 identifier: nasa-nsidcdaac-0092 lat_max: 84 lat_min: 60 lon_max: -15 lon_min: -72 name: 'Greenland 5 km DEM, Ice Thickness, and Bedrock Elevation Grids' native_id: NSIDC-0092 processing_level: ~ publication_year: ~ release_dt: 2001-01-01T00:00:00 scale: ~ scope: ~ spatial_extent: ~ spatial_ref_sys: ~ spatial_res: ~ start_time: 1970-01-01T00:00:00 temporal_extent: ~ temporal_resolution: ~ type: dataset uri: /dataset/nasa-nsidcdaac-0092 url: http://nsidc.org/data/NSIDC-0092 variables: ~ version: ~ vertical_extent: ~ - access_dt: ~ attributes: ~ cite_metadata: ~ data_qualifier: ~ description: "ABSTRACT: The BOREAS DSP-4 team acquired and analyzed imaging radar data from the ESA's ERS-1 over a complete annual cycle at the BOREAS sites in Canada in 1994 to detect shifts in radar backscatter related to varying environmental conditions. Two independent transitions correlating with snow melt and soil thaw onset, and possible canopy thaw were revealed by the data. The results demonstrated that radar provides an ability to observe thaw transitions at the beginning of the growing season, which in turn helps constrain the length of the growing season. The data presented here are gridded maps of landscape freeze/thaw state derived from backscatter change maps. The backscatter change maps were computed from radar backscatter images covering the southern BOREAS sites. The freeze/thaw classifications were determined through application of a change detection threshold based on temporal backscatter change relative to a winter-time frozen reference state. The data are provided as both ASCII text and as binary image (*.gif) format files." description_attribution: http://daac.ornl.gov//BOREAS/FollowOn/guides/dsp04_gridded_ft_maps_doc.html display_name: 'BOREAS Follow-On DSP-04 1994 ERS-1 Level-4 Landscape Freeze/Thaw Maps, Ver. 1.0' doi: 10.3334/ORNLDAAC/590 end_time: 1994-12-14T00:00:00 identifier: nasa-ornldaac-590 lat_max: 60 lat_min: 48 lon_max: -90 lon_min: -111 name: 'BOREAS Follow-On DSP-04 1994 ERS-1 Level-4 Landscape Freeze/Thaw Maps, Ver. 1.0' native_id: dsp04_ers1maps processing_level: ~ publication_year: ~ release_dt: 2001-01-01T00:00:00 scale: ~ scope: ~ spatial_extent: ~ spatial_ref_sys: ~ spatial_res: ~ start_time: 1994-02-14T00:00:00 temporal_extent: ~ temporal_resolution: ~ type: dataset uri: /dataset/nasa-ornldaac-590 url: http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=590 variables: ~ version: ~ vertical_extent: ~ - access_dt: ~ attributes: ~ cite_metadata: ~ data_qualifier: ~ description: 'This dataset contains absolute dynamic topography (similar to sea level but with respect to the geoid) binned and averaged monthly on 1 degree grids. The coverage is from October 1992 to December 2010. These data were provided by AVISO (French space agency data provider) to support the CMIP5 (Coupled Model Intercomparison Project Phase 5) under the World Climate Research Program (WCRP) and was first made available via the JPL Earth System Grid. The dynamic topography are derived from sea surface height measured by several satellites including Envisat, TOPEX/Poseidon, Jason-1 and OSTM/Jason-2, and referenced to the geoid. Along with this dataset, two additional ancillary data files are included in the same directory which contain the number of observations and standard error co-located on the same 1 degree grids.' description_attribution: http://podaac.jpl.nasa.gov/dataset/AVISO_L4_DYN_TOPO_1DEG_1MO display_name: AVISO Level 4 Absolute Dynamic Topography for Climate Model Comparison doi: ~ end_time: 2010-12-30T00:00:00 identifier: nasa-podaac-aviso_l4_dyn_topo_1deg_1mo lat_max: 90 lat_min: -90 lon_max: 360 lon_min: 0 name: AVISO Level 4 Absolute Dynamic Topography for Climate Model Comparison native_id: AVISO_L4_DYN_TOPO_1DEG_1MO processing_level: ~ publication_year: ~ release_dt: 2012-01-24T02:40:25 scale: ~ scope: ~ spatial_extent: ~ spatial_ref_sys: ~ spatial_res: ~ start_time: 1992-10-01T00:00:00 temporal_extent: ~ temporal_resolution: ~ type: dataset uri: /dataset/nasa-podaac-aviso_l4_dyn_topo_1deg_1mo url: http://podaac.jpl.nasa.gov/dataset/AVISO_L4_DYN_TOPO_1DEG_1MO variables: ~ version: ~ vertical_extent: ~ - access_dt: ~ attributes: ~ cite_metadata: ~ data_qualifier: ~ description: 'OSCAR (Ocean Surface Current Analysis Real-time) contains near-surface ocean current estimates, derived using quasi-linear and steady flow momentum equations. The horizontal velocity is directly estimated from sea surface height, surface vector wind and sea surface temperature. these data were collected from the various satellites and in situ instruments. The model formulation combines geostrophic, Ekman and Stommel shear dynamics, and a complementary term from the surface buoyancy gradient. Data are on a 1 degree grid with a 5 day resoultion. OSCAR is generated by Earth Space Research (ESR) http://www.esr.org/oscar_index.html' description_attribution: http://podaac.jpl.nasa.gov/dataset/OSCAR_L4_OC_1deg display_name: OSCAR 1 degree ocean surface currents doi: ~ end_time: ~ identifier: nasa-podaac-oscar_l4_oc_1deg lat_max: 66 lat_min: -66 lon_max: 180 lon_min: -180 name: OSCAR 1 degree ocean surface currents native_id: OSCAR_L4_OC_1deg processing_level: ~ publication_year: ~ release_dt: 2011-01-21T17:10:13 scale: ~ scope: ~ spatial_extent: ~ spatial_ref_sys: ~ spatial_res: ~ start_time: 1992-10-12T00:00:00 temporal_extent: ~ temporal_resolution: ~ type: dataset uri: /dataset/nasa-podaac-oscar_l4_oc_1deg url: http://podaac.jpl.nasa.gov/dataset/OSCAR_L4_OC_1deg variables: ~ version: ~ vertical_extent: ~ - access_dt: ~ attributes: ~ cite_metadata: ~ data_qualifier: ~ description: 'OSCAR (Ocean Surface Current Analysis Real-time) contains near-surface ocean current estimates, derived using quasi-linear and steady flow momentum equations. The horizontal velocity is directly estimated from sea surface height, surface vector wind and sea surface temperature. These data were collected from the various satellites and in situ instruments. The model formulation combines geostrophic, Ekman and Stommel shear dynamics, and a complementary term from the surface buoyancy gradient. Data are on a 1/3 degree grid with a 5 day resolution. OSCAR is generated by Earth Space Research (ESR) http://www.esr.org/oscar_index.html' description_attribution: http://podaac.jpl.nasa.gov/dataset/OSCAR_L4_OC_third-deg display_name: OSCAR third degree resolution ocean surface currents doi: ~ end_time: ~ identifier: nasa-podaac-oscar_l4_oc_third-deg lat_max: 66 lat_min: -66 lon_max: 180 lon_min: -180 name: OSCAR third degree resolution ocean surface currents native_id: OSCAR_L4_OC_third-deg processing_level: ~ publication_year: ~ release_dt: 2011-01-21T17:10:13 scale: ~ scope: ~ spatial_extent: ~ spatial_ref_sys: ~ spatial_res: ~ start_time: 1992-10-12T00:00:00 temporal_extent: ~ temporal_resolution: ~ type: dataset uri: /dataset/nasa-podaac-oscar_l4_oc_third-deg url: http://podaac.jpl.nasa.gov/dataset/OSCAR_L4_OC_third-deg variables: ~ version: ~ vertical_extent: ~ display_name: european-remote-sensing-satellite-1/radar-altimeter-3 href: http://52.38.26.42:8080/platform/european-remote-sensing-satellite-1/instrument/radar-altimeter-3.yaml instrument_identifier: radar-altimeter-3 location: ~ parents: [] platform_identifier: european-remote-sensing-satellite-1 type: instrument_instance uri: /platform/european-remote-sensing-satellite-1/instrument/radar-altimeter-3