2024-03-28T09:58:37.879Zhttps://cmr.earthdata.nasa.gov/opensearch/collections.atomCMRechodev@echo.nasa.govECHO dataset metadataSearch parameters: satellite => RADARSAT-1 boundingBox => geometry => placeName => startTime => endTime => uid => 43101https://cmr.earthdata.nasa.gov/opensearch/collections.atom?uid=C1219899514-SCIOPSCMRechodev@echo.nasa.govAntarctic coastline derived from the 1997 Radarsat SAR image mosaicA complete, high-resolution coastline of Antarctica is extracted from an
orthorectified mosaic of Radarsat-1 Synthetic Aperture Radar (SAR) images
acquired in 1997. The absolute accuracy of planimetric position of the
resultant coastline is estimated better than 130 m, and its spatial resolution
(25 m) is adequate for supporting cartographic and scientific applications at
1:50,000 scale. The data set is given as an ArcInfo line coverage in ArcInfo
interchangable format. The coverage is in Polar Stereographic projection with
reference to WGS84 ellipsoid.C1219899514-SCIOPS1970-01-01T00:00:00.000Z/Antarctic coastline derived from the 1997 Radarsat SAR image mosaicliu_nsf0126149_03Not providedSCIOPSNSIDCNSIDCfalsefalsefalsefalsefalsefalsefalsefalse0.65org.geoss.geoss_data-coretruehttps://cmr.earthdata.nasa.gov/opensearch/collections.atom?uid=C1214311458-AU_AADCCMRechodev@echo.nasa.govGEOSSAntarctic iceberg sizes and spatial distribution from SAR image analysis - MapThis map shows the distribution of the iceberg data extracted from ERS SAR images.
Icebergs are identified in Synthetic Aperture Radar [SAR] images by image analysis using the texture and intensity of the microwave backscatter observations. The images are segmented using an edge detecting algorithm, and segments identified as iceberg or background, which may be sea ice, open water, or a mixture of both. Dimensions of the icebergs are derived by spatial analysis of the corresponding image segments. Location of the iceberg is derived from its position within the image and the navigation data that gives the location and orientation of the image.
More than 20,000 individual observations have been extracted from SAR images acquired by the European Space Agency's ERS-1 and 2 satellites and the Canadian Space Agency's Radarsat satellite. Because images can overlap, some proportion of the observations represent multiple observations of the same set of icebergs.
Most observations relate to the sector between longitudes 70E and 135E. The data set includes observations from several other discrete areas around the Antarctic coast. In general observations are within 200 km of the coast but in limited areas extend to about 500 km from the coast.
This metadata record has been derived from work performed under the auspices of ASAC project 2187 (ASAC_2187).
The map in the pdf file shows the extent of the coverage of individual SAR scenes used in the analysis and the abundance and size characteristics (by a limited colour palette) of the identified icebergs.C1214311458-AU_AADC1991-09-01T00:00:00.000Z/1991-09-01T23:59:59.999ZAntarctic iceberg sizes and spatial distribution from SAR image analysis - MapAAD_Ant_iceberg_SAR1AU_AADCAU/AADCAU/AADCCARTESIAN-80 70 -55 135falsefalsefalsefalsefalsefalsefalsefalse0.65https://cmr.earthdata.nasa.gov/opensearch/collections.atom?uid=C1219899516-SCIOPSCMRechodev@echo.nasa.govAntarctic snow zones derived from the 1997 Radarsat SAR image mosaicDry snow zones, percolation zones, wet snow zones, and blue ice patches for the
Antarctic continent are delineated from the 1997 Radarsat SAR image mosaic. The
data set is given as an ArcInfo polygon coverage in ArcInfo interchangable
format. The coverage is in Polar Stereographic projection with reference to
WGS84 ellipsoid.C1219899516-SCIOPS1970-01-01T00:00:00.000Z/Antarctic snow zones derived from the 1997 Radarsat SAR image mosaicliu_nsf0126149_04Not providedSCIOPSNSIDCNSIDCfalsefalsefalsefalsefalsefalsefalsefalse0.65org.geoss.geoss_data-coretruehttps://cmr.earthdata.nasa.gov/opensearch/collections.atom?uid=C1214305672-AU_AADCCMRechodev@echo.nasa.govGEOSSAustralian Antarctic Territory Coastline 2003The 'Australian Antarctic Territory coastline 2003' dataset is a digital vector representation of the coastline of Antarctica, between 45 to 160 degrees east, based on both the edge of permanent ice and grounding line, derived by means of remote sensing interpretation.
A 'proof of concept' methodology over a test area was carried out to compare a number of complementary remote sensing techniques, including interferometry and airborne ice radar profiling, to confirm validation of grounding line as mapped from Landsat 7 ETM+ imagery. This methodology concept then served to validate grounding line locations elsewhere along the coast of the AAT.
The National Mapping Division of Geoscience Australia and the Australian Antarctic Division developed this dataset as a joint project.
Where available, Australian Antarctic Division supplied large-scale vector data of various areas around the AAT, which were included as part of the main coastline dataset. These included:
* Holme Bay 1:25,000 GIS dataset
* Larsemann Hills - Mapping from aerial photography captured February 1998
* Rauer Group 1:50000 Topographic GIS Dataset
* Vestfold Hills Topographic GIS Dataset
* Windmill Islands 1:50000 Topographic GIS Dataset
* Cape Denison and McKellar Islands GIS dataset from Ikonos satellite imagery
Refer to the metadata record for each of these datasets for further information.
The coastline dataset is comprised of three parts: one polygon coverage consisting of ice features, and another one consisting of coastal features. A third coverage consists of only island point features (islands too small to be shown as polygons).
This dataset supersedes the Australian Antarctic Territory Coastline 2001 dataset which is also part of SCAR's Antarctic Digital Database (ADD) version 4 and version 5. It replaces data digitised from Landsat 4 and 5, with that from Landsat 7 ETM+, because of its more reliable positional accuracy and more recent acquisition.
The Australian Antarctic Territory Coastline 2001 dataset and metadata record have been archived. Please contact the Australian Antarctic Data Centre if you would like a copy of this data and metadata.C1214305672-AU_AADC2000-09-25T00:00:00.000Z/2003-07-15T23:59:59.999ZAustralian Antarctic Territory Coastline 2003AAT_Coastline_20031AU_AADCAU/AADCAU/AADCCARTESIAN-82.679 42.723 -64.929 169.333falsefalsefalsefalsefalsefalsefalsefalse0.65https://cmr.earthdata.nasa.gov/opensearch/collections.atom?uid=C1214620690-SCIOPSCMRechodev@echo.nasa.govCollaborative Research:History and Evolution of the Siple Coast Ice Stream Systems as Recorded by Former Shear-Margin ScarsThis data set is a study of the scar-like features that are well-known from the
Siple Coast ice stream system in West Antarctica. The objective of the field
work was to identify the nature of several scars, and to further characterize
previously-identified margin scars that were poorly dated. Advanced Very High
Resolution Radiometer (AVHRR) and Radarsat image data were used to locate and
map the features, and place them in a regional context. The study sought to
describe the recent history of the Siple Coast glaciers and investigate the
causes of their changes in configuration. The main investigative tools were
low-frequency RES and high-frequency ground penetrating radar (GPR) profiles to
image internal layers and measure depths to buried crevasses or disrupted
layering. This, coupled with accumulation rates determined from shallow ice
cores, provided "shutdown" ages for the margin features. The field data will
provided input parameters for simple models of ice flow for margins and
inter-ice stream ridges during active shearing and after shutdown.C1214620690-SCIOPS1970-01-01T00:00:00.000Z/Collaborative Research:History and Evolution of the Siple Coast Ice Stream Systems as Recorded by Former Shear-Margin Scarsraymond_nsf9909518Not providedSCIOPSNSIDCNSIDCNSIDC_AGDCCARTESIAN-85 -134 -80 -154falsefalsefalsefalsefalsefalsefalse0.65org.geoss.geoss_data-coretruehttps://cmr.earthdata.nasa.gov/opensearch/collections.atom?uid=C1214308565-AU_AADCCMRechodev@echo.nasa.govGEOSSFast-ice Distribution in East Antarctica During 1997 and 1999 Determined Using RADARSAT DataAn image correlation technique has been applied to RADARSAT ScanSAR images from November in 1997, and November 1999, to create the first detailed maps of fast ice around East Antarctica (75E-170E). This method is based upon searching for, and distinguishing, correlated regions of the ice-covered ocean which remain stationary, in contrast to adjacent moving pack ice. Within the overlapping longitudinal range of ~86E-150.6E, the total fast-ice area is 141,450 km2 in 1997 and 152,216 km2 in 1999. Calibrated radar backscatter data are also used to determine the distribution of two fast-ice classes based on their surface roughness characteristics.
The outer boundaries of the determined fast-ice area for November in 1997 and 1999 are contained in the data files for this record.
This work has been allocated to ASAC project 3024.C1214308565-AU_AADC1997-11-01T00:00:00.000Z/1999-11-30T23:59:59.999ZFast-ice Distribution in East Antarctica During 1997 and 1999 Determined Using RADARSAT Datafast_ice_1997_19991AU_AADCAU/AADCAU/AADCCARTESIAN-70 75 -55 170falsefalsefalsefalsefalsefalsefalsefalse0.65https://cmr.earthdata.nasa.gov/opensearch/collections.atom?uid=C1214313515-AU_AADCCMRechodev@echo.nasa.govGEOSSHeard Island RADARSAT (1997) Digital Elevation Model (DEM)A Digital Elevation Model (DEM) of Heard island, with a 50 metre grid interval, and held in UTM Zone 43(WGS-84) coordinates. Heights are referenced to mean sea level. 50 metre contours (including a coastline) were derived. Elevation range 0 - less than 2800m.C1214313515-AU_AADC1997-10-24T00:00:00.000Z/1997-10-24T23:59:59.999ZHeard Island RADARSAT (1997) Digital Elevation Model (DEM)heard_dem_radarsat971AU_AADCAU/AADCAU/AADCCARTESIAN-53.2 73.238 -52.957 73.89falsefalsefalsefalsefalsefalsefalsefalse0.65https://cmr.earthdata.nasa.gov/opensearch/collections.atom?uid=C1214308612-AU_AADCCMRechodev@echo.nasa.govGEOSSHeard Island RADARSAT (2002) Digital Elevation Model (DEM)This dataset is a Digital Elevation Model (DEM) of Heard Island derived by interferometric processing from RADARSAT images acquired on 17 February 2002 and 13 March 2002. The DEM was created by a contractor for the Australian Antarctic Data Centre. The cell size is 10 metres.
Processing stages included:
1 Detection of a coastline from a RADARSAT image of Heard Island acquired 24 January 2002 and rectified using ground control points provided by a second contractor.
2 Generation of the interferometric SAR (InSAR) DEM using the RADARSAT images acquired on 17 February 2002 and 13 March 2002.
3 Co-registration of the InSAR DEM with a DEM derived from stereoscopic RADARSAT images acquired in March and April of 1997 and described by the metadata record 'Heard Island RADARSAT (1997) DEM'.
4 Merging of the InSAR DEM with the 1997 stereoscopic DEM and the coastline detected in stage 1.
The following are available for download from the Related URLs below:
1 The final DEM in ArcInfo interchange or ArcInfo ascii formats.
2 The rectified RADARSAT image of Heard Island acquired 24 January 2002. Rectified using ground control points and subsequently used in processing of the DEM.
3 Contours generated from the DEM and the island polygon (coastline) extracted from the rectified RADARSAT image acquired 24 January 2002.
4 A detailed deport describing the generation of the DEM.
5 A report by
Dr Arko Lucieer
Centre for Spatial Information Science
School of Geography and Environmental Studies
University of Tasmania
Private Bag 76
Hobart 7001
Tasmania, Australia
outlining some errors and artefacts in the DEM.
Dr Lucieer produced this report while working for the Australian Antarctic Division.
On 3 July 2003 Henk Brolsma (Mapping Officer, Australian Antarctic Division) wrote the following email to the contractor who created the DEM. "What I'm really interested in are the 20 metre contours for the areas with high coherency. These are the areas where most of the field work takes place and where we have a need for contours with an accuracy better than 50 metres and my reason for using INSAR in the first instance. So can you send me: 1. The 20 metre contours for the areas with high coherency? 2. The zone or line where the INSAR and Stereo Imagery were integrated? This would be very useful for the metadata." He did not receive a reply to that email and that was the reason why he was reluctant to make the DEM public. Since he won't now get a reply and the DEM is probably better than the 1997 DEM, he considers the 2002 DEM should now be published.C1214308612-AU_AADC2002-01-24T00:00:00.000Z/2002-03-13T23:59:59.999ZHeard Island RADARSAT (2002) Digital Elevation Model (DEM)heard_dem_radarsat021AU_AADCAU/AADCAU/AADCCARTESIAN-53.27694 73.18306 -52.80806 73.97306falsefalsefalsefalsefalsefalsefalsefalse0.65https://cmr.earthdata.nasa.gov/opensearch/collections.atom?uid=C1214313518-AU_AADCCMRechodev@echo.nasa.govGEOSSHeard Island Radarsat Georeferencing Report, September 2002The aim of the project was to derive a number of control points that could be used to georeference two Radarsat scenes over Heard Island. Control points were derived from aerial photography covering various locations around the island, namely: Cape Gazert, Atlas Cove, Brown Lagoon, Manning Lagoon and Winston Lagoon.
ERDAS Imagine with OrthoBase Pro photogrammatric software was used to ortho-rectify the aerial photography and extract values for the derived control points. ERDAS Imagine OrthoRadar was used to georeference the Radarsat images.
The measurements taken from the aerial photography have been described in an earlier report.C1214313518-AU_AADC2002-09-01T00:00:00.000Z/2002-09-30T23:59:59.999ZHeard Island Radarsat Georeferencing Report, September 2002Heard_RadarSat_georef1AU_AADCAU/AADCAU/AADCCARTESIAN-53.21 73.24 -52.95 73.9falsefalsefalsefalsefalsefalsefalsefalse0.65https://cmr.earthdata.nasa.gov/opensearch/collections.atom?uid=C1214311224-AU_AADCCMRechodev@echo.nasa.govGEOSSHeard Island, Laurens Peninsula, Coastal Orthophoto Mosaic derived from Non-Metric PhotographyThe orthophoto mosaic is a rectified georeferenced image of the Heard Island, Laurens Peninsula Coastal Area. Distortions due to relief and tilt displacement have been removed. Orthophotos were derived from non-metric cameras (focal length unknown).C1214311224-AU_AADC1980-01-01T00:00:00.000Z/2000-12-31T23:59:59.999ZHeard Island, Laurens Peninsula, Coastal Orthophoto Mosaic derived from Non-Metric Photographyphoto_mosaic_laurens_or1AU_AADCAU/AADCAU/AADCCARTESIAN-53.05 73.23 -52.95 73.41falsefalsefalsefalsefalsefalsefalsefalse0.65