2026-03-10T12:22:44Zhttp://nsidc.org/api/dataset/metadata/oaioai:nsidc.org/NSIDC-0103.0022026-03-03T21:04:07Zv0_daacv0_allnasa_nsidc_daac
NSIDC-0103.002RAMP AMM-1 SAR Image Mosaic of AntarcticaJezek, K. C., Curlander, J. C., Carsey, F., Wales, C. & Barry, R. G.RAMP AMM-1 SAR Image Mosaic of Antarctica2013-03-12Boulder, Colorado USANASA NSIDC DAAC: NASA National Snow and Ice Data Center Distributed Active Archive Center2false10.5067/8AF4ZRPULS4Hhttps://nsidc.org/sites/default/files/nsidc-0103-v002-userguide_0.pdfNSIDC-0103InvestigatorKennethC.JezekDepartment of Geological Sciencesand Byrd Polar Research CenterThe Ohio State UniversityColumbusOH43210InvestigatorJohnC.CurlanderVexcel CorporationBoulderCO80301InvestigatorFrankCarseyJet Propulsion LaboratoryPasadenaCA91109InvestigatorCarlWalesAlaska SAR Facility (ASF)Geophysical InstituteUniversity of Alaska FairbanksFairbanksAK99775InvestigatorR.G.Barry449 UCBBoulderCO80309-0449USATechnical ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-61991-303-492-2468CIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAEARTH SCIENCECRYOSPHEREGLACIERS/ICE SHEETSGLACIERS EARTH SCIENCECRYOSPHEREGLACIERS/ICE SHEETSICE SHEETS EARTH SCIENCESPECTRAL/ENGINEERINGRADARRADAR BACKSCATTER EARTH SCIENCESPECTRAL/ENGINEERINGRADARRADAR IMAGERY EARTH SCIENCESPECTRAL/ENGINEERINGRADARRADAR REFLECTIVITY EARTH SCIENCESPECTRAL/ENGINEERINGRADARSIGMA NAUGHT Alaska SAR FacilityAMM-1AntarcticaAntarctic Mapping Mission 1Byrd Polar Research CenterCanadian Space AgencyCrevassesCSAField CampsGlacier FlowglaciersGoddard Space Flight CenterIce Flowice sheetsICE STREAMSice surfacesImage MosaicJet Propulsion LaboratoryKen JezekKenneth JezekLANDFORMSNASANASA Pathfinder ProgramNational Aeronautics and Space AdministrationNational Imagery and Mapping AgencyNational Snow and Ice Data CenterNIMANSIDCNSIDC-0103RADARSAT-1Radarsat Antarctic mapping projectRadarsat imageryRadarsat imagesRAMPRAMP-projectRunwaysSAR imagerySAR imagesSatellite Radar DataSnowmobile TracksSubsurface FeaturesSurface Layer BackscatterSynthetic Aperture Radar ImageryThe Ohio State UniversityVexcel CorporationSARSynthetic Aperture RadarRADARSAT-11997-09-011997-10-31complete-90-60-180180Geographic RegionSouthern HemisphereGeographic RegionPolarContinentAntarcticaThese data are freely, openly, and fully accessible, provided that you are logged into your NASA Earthdata profile (https://urs.earthdata.nasa.gov/).These data are freely, openly, and fully available to use without restrictions, provided that you cite the data according to the recommended citation at https://nsidc.org/about/use_copyright.html. For more information on the NASA EOSDIS Data Use Policy, see https://earthdata.nasa.gov/earth-observation-data/data-use-policy.EnglishNASA NSIDC DAACNASA National Snow and Ice Data Center Distributed Active Archive Centerhttps://nsidc.org/daacData Center ContactNSIDCUser Servicesnsidc@nsidc.org1-303-492-6199National Snow and Ice Data CenterCIRES, 449 UCBUniversity of ColoradoBoulderCO80309-0449USAFTPBinaryFTPGeoTIFFJezek, K. C. 1999. Glaciological properties of the Antarctic ice sheet from RADARSAT-1 synthetic aperture radar imagery. Annals of Glaciology 29:286-290. Jezek, K.C. in press. RADARSAT-1 Antarctic mapping project: change detection and surface velocity campaign. Annals of Glaciology 34.The mosaic provides a detailed look at ice sheet morphology, rock outcrops, research infrastructure, the coastline, and other features of Antarctica, as well as representing calibrated radar backscatter data, which may provide insight into climate processes affecting the upper few meters of snow cover.VIEW RELATED INFORMATIONhttps://nsidc.org/sites/default/files/nsidc-0103-v002-userguide_0.pdfRAMP AMM-1 SAR Image Mosaic of Antarctica, Version 2 User GuideGET DATAhttps://daacdata.apps.nsidc.org/pub/DATASETS/nsidc0103_radarsat_sar/HTTPSVIEW RELATED INFORMATIONhttp://nsidc.org/data/ramp/index.htmlRADARSAT Product Web SiteUSA/NASACEOS IDN DIFVERSION 9.92013-03-122026-03-03NSIDCVersion Summary<p>Removed Version 1 data because of a number of image processing problems that were fixed in Version 2 data. Version 2 data benefits from the following error corrections and other updates:</p>
<ul>
<li>RAMS software was modified to address the antenna pattern banding problem, which resulted in blocks with bright centers and dark edges; thus, a radial banding pattern across the Version 1 mosaic. This banding effect is greatly reduced in Version 2, although faint banding caused by drops in sigma-naught with decreasing incidence angle remains.</li>
<li>ASF provided corrected noise floor vector data to reduce noise in low-backscatter areas.</li>
<li>Ghosting was only a minor problem in the Version 1 mosaic, and was further reduced in Version 2. Ghosting is an effect of side-lobe detection of bright features. When the main antenna lobe is imaging very low-backscatter targets, it is possible that bright targets passing beneath a side-lobe of the antenna will scatter enough energy back toward the antenna to be detected and mapped erroneously at the location the main lobe was viewing. As a result, bright coastal features can appear as ghost images in regions of very dark snow near the South Pole. The problem has been addressed by selection of alternate passes without ghost images.</li>
<li>Version 2 of the RAMP DEM was used in processing the Version 2 mosaic. Swath data were reprojected onto the new DEM surface, improving the georegistration of the mosaic.</li>
<li>Shadow and layover problems were addressed by covering all mountainous areas with ST7 data, such as RADARSAT-1 data acquired using a different standard beam looking mode. ST7 data are radiometrically much darker then the ST2 data used for most of the mosaic, so their use resulted in a few radiometric artifacts.</li>
<li>As with Version 2 of the RAMP DEM, Version 2 of the RAMP mosaic extends farther over the sea ice surrounding Antarctica.</li>
<p>The effects of Automatic Gain Control (AGC) used in initial data gathering by the satellite remain in the Version 2 images. In collecting the data, a region of each swath is sampled for intensity so that the gain of the processed data may be set optimally for increased contrast over the surface to be imaged. Within swaths that include abrupt changes in surface type, for example, near the coast or near rock outcrops, this initial sample may include only water or rock outcrop, and thus the gain is set for these surfaces rather than for ice. The section of the swath is processed with gains that are not optimal for the ice sheet mosaic. The affected regions of the ice sheet show up as slightly darker blocks or corners within the mosaic.</p>
</ul>NSIDCMinor VersionNSIDCCurrent Version1NSIDCLevel of ServiceStandardNSIDCFull Dataset CitationJezek, K. C., Curlander, J. C., Carsey, F., Wales, C. & Barry, R. G. (2013). <i>RAMP AMM-1 SAR Image Mosaic of Antarctica</i>. (NSIDC-0103, Version 2). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. <a href="https://doi.org/10.5067/8AF4ZRPULS4H">https://doi.org/10.5067/8AF4ZRPULS4H</a>. [<i><describe subset used if applicable></i>].NSIDCRetiredfalseNSIDCRelated Servicesapplication/vnd.nasa.cmr.umm+jsonfalseamyygillilandmmt_service_12717S1977897447-NSIDCV0NSIDCV06service2025-04-01T22:12:52.112Zhttps://daacdata.apps.nsidc.org/NSIDCV0_DAAC_Data_HTTPS_File_SystemNOT PROVIDED1HTTPS File SystemQuickly download a few files using a web browser, or access the data through a command-line utility such as WGET.https://nsidc.org/data/user-resources/help-center/programmatic-access-guide-data-daacdataappsVIEW RELATED INFORMATIONProgrammatic Data Access GuidePublicationURLUSER SERVICESNSIDC DAAC User ServicesEmailnsidc@nsidc.orgDATA ACCESS/RETRIEVALDATA MANAGEMENT/DATA HANDLINGEARTH SCIENCE SERVICESThis is the most current release of this service.DEVELOPERORIGINATORPUBLISHERSERVICE PROVIDERNASA National Snow and Ice Data Center Distributed Active Archive CenterNASA NSIDC DAACNASA Distributed Active Archive Center (DAAC) at NSIDChttps://nsidc.org/daacNSIDC DAAC Home Pagehttps://cdn.earthdata.nasa.gov/umm/service/v1.4UMM-S1.4https://daacdata.apps.nsidc.org/pub/DATASETS/nsidc0103_radarsat_sar/