There is ample evidence indicating large and rapid changes of the Antarctic Ice Sheet (AIS) in recent decades, including the break-up of several large ice shelves followed by glacier acceleration and retreating grounding lines, resulting in increased ice discharge and contributing to sea level rise.
Mapping glacier velocity and temporal changes in flow velocity provides key information for investigating the dynamic response of glaciers and ice sheets to changing boundary environmental conditions.
The Ice Velocity (IV) product in will be based on a combination of several SAR techniques, namely Differential SAR Interferometry, MAI and offset tracking. The latter shall also be used on optical imagery, for epochs/areas where SAR data is not available. Further details of the methods are provided in the following section and in the Algorithm Theoretical Basis Document (ATBD). The IV measured by space-borne SAR and optical sensors represents a mean velocity value, referred to a temporal span ranging from a minimum value provided by the satellite repeat-cycle (between 1 to 46 days for past and current sensors) to higher ones, typically several months, required to cover areas as large as the whole GrIS or to increase measurement sensitivity.
IV products are provided on ENVEO CryoPortal: http://cryoportal.enveo.at/. Access to product downloads requires registration and login. There are different user levels (anonymous, external, partner & staff) that determine the permissions for reading and accessing the data.