Input Satellite Data Specification
Sentinel-1a Interferometric Wide Swath mode (IWS) Synthetic Aperture Radar (SAR) satellite data is the primary input dataset. Single Look Complex (SLC) data was retrieved freely and openly from the ESA Scientific Data Hub
Co-registration of the image pairs was performed using orbit information only. Where available, the orbit information provided in the Sentinel-1 satellite metadata has been updated with precise orbit ephemerides provided by the Sentinel-1 Payload Data ground Segment (PDGS
). Due to differences in the speed with which the satellite data and precise orbit information can be generated and delivered, some image pairs may have been processed using the standard metadata, rather than the precise orbit information.
Sentinel-1b was launched on 3rd April 2014, however the first scientific quality datasets were acquired in November 2014. The length of the time series of input Sentinel-1a data varies for each ice stream due to differences in the data acquisition planning strategy. The whole archive of available data has been processed for each ice stream up to the present day.
Antarctic data has been geocoded using a Polar stereographic projection, with a central meridian of 0.0 decimal degrees, and a central latitude of -71.0 decimal degrees.
Greenland data has been geocoded using a Polar stereographic projection, with a central meridian of -45.0 decimal degrees, and a central latitude of 70.0 decimal degrees.
Gridded ice speeds are provided in geotiff format from a smaller extracted area across the central trunk of each ice stream, with a 100 metre by 100 metre grid spacing. A corresponding signal to noise ratio dataset is also provided in geotiff format as a relative measure of the data quality. Ice Speed data extracted from an along flow, and across flow transect from each ice stream is provided as an ascii text files. Columns correspond to:
PSx location, Psy location, ice velocity (m/yr), distance along transect (km).
We welcome feedback on our products and the website.
For inquiries of a scientific nature, please contact:
Dr. Anna Hogg
For inquiries related to web site operations please contact:
Emma Hatton at E.L.Hatton@leeds.ac.uk
These data were generated through a grant from the Natural Environment Research Council (NERC).
Spaceborne Synthetic Aperture Radar (SAR) acquisitions were provided by the European Space Agency (ESA).
The Sentinel satellite missions are designed, launched and operated as a result of close collaboration between ESA, the European Commission, industry, service providers and data users.
Please credit the following reference when using data from this site:
Hogg, A., A. Shepherd, N. Gourmelen (2015) A first look at the performance of Sentinel-1 over the West
Antarctic Ice Sheet, FRINGE 2015, Frascati, Italy, 23-27 March 2015.