A NASA MEaSUREs project to provide automated, low latency, global glacier flow and elevation change datasets.

Overview

The Inter-mission Time Series of Land Ice Velocity and Elevation (ITS_LIVE) project facilitates ice sheet, ice shelf and glacier research by providing a globally comprehensive and temporally dense multi-sensor record of land ice velocity and elevation with low latency.


Product

Description

velocity mosaics Image of Antarctic Regional velocity mosaics created from the synthesis of all scene-pair velocities.

o Coverage: All major land ice regions1
o Date range: 1985-present1
o Resolution: 120 m & 240 m2
o Frequency: Monthly & Annual

o Available now, Beta V0, Landsat only3
scene-pair velocities Image of land Ice Scene-pair velocities generated from satellite optical and radar imagery.

o Coverage: All land ice1
o Date range: 1985-present1
o Resolution: 240m
o Scene-pair separation: 6 to 546 days

o Availability: Summer 2020
elevation change Satellite Image of Antarctic Elevation change from the synthesis of satellite laser (ICESat, ICESat-2) and radar (ERS-1, ERS-2, Envisat, CryoSat-2, Sentinel 3a/3b) altimetry.

o Coverage: Ice sheets & ice shelves
o Date range: 1992-present
o Resolution: 3840 m
o Frequency: Quarterly

o Availability: Spring 2020

1coverage dependent on data availability and quality. Complete global coverage for years 2014-present
2weighted average of all years provided at 120 m and 240 m, all other data provided at 240 m
3At this time only a beta version (v0) of the annual velocity mosaics that are generated from Landsat imagery are publicly available.

Data Access


Velocity mosaics

Documentation


Regional Glacier and Ice Sheet Surface Velocities (PDF - 283KB)

Regional Glacier and Ice Sheet Surface Velocities - known issues (PDF - 2MB)

Getting started

Working with ITS_LIVE data and basemaps in QGIS without downloading the data (PDF - 26MB)

How to Cite

The recommended citation for the Regional Glacier and Ice Sheet Surface Velocities is:
"Velocity data generated using auto-RIFT (Gardner et al., 2018) and provided by the NASA MEaSUREs ITS_LIVE project (Gardner et al., 2019)."

Gardner, A. S., M. A. Fahnestock, and T. A. Scambos, 2019 [update to time of data download]: ITS_LIVE Regional Glacier and Ice Sheet Surface Velocities. Data archived at National Snow and Ice Data Center; doi:10.5067/6II6VW8LLWJ7.

Gardner, A. S., G. Moholdt, T. Scambos, M. Fahnstock, S. Ligtenberg, M. van den Broeke, and J. Nilsson, 2018: Increased West Antarctic and unchanged East Antarctic ice discharge over the last 7 years, Cryosphere, 12(2): 521–547, doi:10.5194/tc-12-521-2018.

Data used

Landsat 4,5,7,8 data were provided by the U.S. Geological Survey.

Copernicus Sentinel-1 and Sentinel-2 data were acquired, processed, and generated by the European Space Agency (ESA).

ERS-1 and ERS-2 altimetry data were provided by ESA’s Reprocessed ESA ERS Altimetry (REAPER) project.

Envisat and CryoSat altimetry data were acquired, processed, and generated by the European Space Agency (ESA).

ICESat altimetry data was provided by NASA through NSIDC.

Contact

All questions can be addressed to NSIDC User Services: nsidc@nsidc.org

People


Principle Investigator

Alex Gardner
Alex Gardner
JPL, Caltech


Co-Investigators

Mark Fahnestock
Mark Fahnestock
Geophysical Institute, UAF
Ted Scambos
Ted Scambos
ESOC, UCB
Piyush Agram
Piyush Agram
JPL, Caltech
Franz Meyer
Franz Meyer
Geophysical Institute, AUF
Johan Nilsson
Johan Nilsson
JPL, Caltech
Fernando Paolo
Fernando Paolo
JPL, Caltech
Catherine Walker
Catherine Walker
WHOI


Researchers

Amaury Dehecq
Amaury Dehecq
JPL, Caltech
Yang Lei
Yang Lei
GPS, Caltech
Chad Greene
Chad Greene
JPL, Caltech


Advisory Board

Noel Gourmelen
Noel Gourmelen
U. Edinburgh
Hamish Pritchard
Hamish Pritchard
British Antarctic Survey