Overview

Satellite observations reveal how the world’s glaciers have responded to recent changes in climate, and can inform predictions of future sea level rise. To enable the next generation of ice sheet models and process-based studies, ITS_LIVE provides a decades-long, high-resolution record of global ice velocity and elevation change. The cloud-based ITS_LIVE architecture continually processes and synthesizes new data from multiple optical, radar, and laser satellite sensors, resulting in a high-resolution, low-latency product that can be used for scientific studies within days of data collection.

Spatial coverage: Global
Temporal coverage: 1985 - Present
Resolution: 120m
Frequency: Variable, Monthly, Annual
Formats: NetCDF, QGIS VRT, GeoTIFF, Zarr

Have any questions? Ask the ITS_LIVE community on GITTER

Instant Global Data Access

Datasets

Regional Velocity Mosaics (1985-Present)

Antarctic Elevation Change (1985-2020)

Global Image-pair Velocities (1985-Present)

Antarctic Annual Ice Sheet Extent Masks (1997-2021)

Antarctic Quarterly Ice Shelf Height Change and Basal Melt Rates (1992-2017)

Greenland Monthly Ice Sheet Extent Masks (1972-Present)

Data Access

Data Portal

Web app to explore and download annual velocity mosaics and image pair data.

Jupyter Notebooks

Jupyter notebooks to access and visualize ice velocity time series from ITS_LIVE data cubes.

Repository: https://github.com/nasa-jpl/its_live

Click the binder link below to browse the data now

API

OpenAPI endpoint

Python

import requests

base_url = "https://nsidc.org/apps/itslive-search/velocities/urls/"
# Iceland
params = {
  "bbox": "-24.60,63.78,-15.11,66.30",
  "start": "1985-02-01",
  "end": "2021-05-01",
  "percent_valid_pixels": 20, # percent of valid glacier pixels
  "min_interval": 7, # days of separation between image pairs
  "max_interval": 100, # days of separation between image pairs
  "version": 2 # version 1 requires an EDL access token header in the request
}
# This will return a list of NetCDF files in AWS S3 that can be accessed
# in the cloud or externally
velocity_pairs = requests.get(base_url, params=params)

Note: Since April 2023, V1 data is hosted at NSIDC and its access requires authentication with NASA Earthdata Login (EDL). Here are some resources to learn how to access data behind EDL.
NSIDC Programmatic Access Guide
NASA’s EDL User Knowledge Base
Or in Python we can use a library like earthaccess
Using commands like Curl or wget we need to add an EDL bearer token to our requests
export EDL_TOKEN=YOUR_EDL_TOKEN
wget --header="Authorization: Bearer ${EDL_TOKEN}" $ITS_LIVE_URL
EDL tokens can be generated in the EDL token website

Data Cubes

GeoJSON Data Cubes Catalog (5MB)

In addition to NetCDF image pairs and mosaics, ITS_LIVE produces cloud-optimized Zarr datacubes, which contain all image-pair data, co-aligned on a common grid for simplified data access. Cloud optimization enables rapid analysis without intermediary data servers, and ITS_LIVE datacubes map directly into Python xarray or Julia ZArray structures. ITS_LIVE provides basic access and plotting tools in both Python and Julia, making it easy to incorporate the datacubes into workflows locally or on remote servers.

Documentation

Getting started

Have any questions? Ask the ITS_LIVE community on GITTER

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

Open source tools

autoRIFT: A highly accurate and efficient algorithm for finding the pixel displacement between two radar or optical images

NSIDC notebook: A Jupyter notebook to search and download ITS_LIVE scene-pair velocity.

Chad Greene's Matlab collection: A set of Matlab functions for accessing, analyzing, and plotting ITS_LIVE velocity data. These functions are intended to streamline the process of loading ITS_LIVE mosaics, interpolating, generating flowlines, and creating maps of ice flow.

ITS_LIVE API: An API for searching ITS_LIVE scene-pair velocities.

Geogrid: A Python module for precise mapping between (pixel index, pixel displacement) in imaging coordinates and (geolocation, motion velocity) in geographic Cartesian (northing/easting) coordinates

Emma Marshall's ITS_LIVE tutorial: A Jupyterbook tutorial to demonstrate how to access and work with with multi-dimensional remote sensing data from ITS_LIVE using xarray.

Jacob Fahnestock's velocity webapp: A serverless React-Leaflet website to plot and share ITS_LIVE data

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., 20XX)."

The recommended citation for the Antarctic Ice Sheet Elevation Change data is:
"Antarctic Ice Sheet Elevation Change data (Nilsson et al., 2022) provided by the NASA MEaSUREs ITS_LIVE project (Nilsson et al., 20XX)."

Gardner, A. S., M. A. Fahnestock, and T. A. Scambos, 2019 [update to time of data download]: MEaSUREs ITS_LIVE Landsat Image-Pair Glacier and Ice Sheet Surface Velocities: Version 1. Data archived at National Snow and Ice Data Center. https://doi.org/10.5067/IMR9D3PEI28U

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: Version 1. Data archived at National Snow and Ice Data Center; https://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, https://doi:10.5194/tc-12-521-2018.

Nilsson, J., Gardner, A., & Paolo, F. [update to time of data download]: MEaSUREs ITS_LIVE Antarctic Grounded Ice Sheet Elevation Change, Version 1, https://doi.org/10.5067/L3LSVDZS15ZV.

Nilsson, J., Gardner, A. S., and Paolo, F. S.: Elevation change of the Antarctic Ice Sheet: 1985 to 2020, Earth Syst. Sci. Data, 14, 3573–3598, https://doi.org/10.5194/essd-14-3573-2022, 2022.