• "Stage for Delivery" orders in NASA's Earthdata Search will be disabled between Tuesday, May 30, 6 pm (US Mountain Time) and Thursday, June 1, 7 am (US Mountain Time) for planned system maintenance. During this period, users will not be able to request data using this access method. All other download methods will remain available (except during the NSIDC DAAC scheduled downtime).

  •  On Wednesday, May 31st from 7:30 a.m. to 10:30 a.m. (US Mountain Time), the following data collections may not be available due to planned system maintenance: ASO, AMSR Unified, AMSR-E, Aquarius, High Mountain Asia, IceBridge, ICESat/GLAS, ICESat-2, LVIS, MEaSUREs, MODIS, Nimbus, SMAP, SnowEx, SSM/I-SSMIS and VIIRS.

SnowEx17 Ground Penetrating Radar, Version 2 (SNEX17_GPR)
Data set:
This is the most recent version of these data.
Version Summary
Updated the radar velocity used to convert radar travel time to snow depth; updated the assumed density used to calculate snow water equivalent, which is now provided in cm rather than mm; updated data files to no longer include column 12 (Transect #); and removed Week 3 data (21 February to 23 February 2017).

Week 3 data (21 February to 25 February) was later added as part of a minor version update.


This data set contains the results of a ground penetrating radar survey conducted at Grand Mesa, Colorado. Data include the two-way travel time, calculated snow depth, and calculated snow water equivalent. Data were collected between 08 February 2017 and 25 February 2017 as part of the 2017 SnowEx campaign. The unprocessed, raw data are also archived at NSIDC (DOI: 10.5067/ZPOLBRHVWG5V).
Data Format(s):
Temporal Coverage:
8 February 2017 to 25 February 2017
Temporal Resolution:
Not applicable
Spatial Resolution:
Not applicable
Not applicable
Spatial Reference System(s):
WGS 84 / UTM zone 12N
Spatial Coverage:
Yellow areas on the map below indicate the spatial coverage for this data set.

Data Access & Tools

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Help Articles

How To

Many NSIDC DAAC data sets can be accessed using the NSIDC DAAC's Data Access Tool. This tool provides the ability to search and filter data with spatial and temporal constraints using a map-based interface. Users have the option to
The "Snow Depth and Snow Cover Data Exploration” Jupyter Notebook provides Python code to access and compare coincident snow data across in-situ, airborne, and satellite platforms from NASA's SnowEx, ASO, and MODIS data sets, respectively.
All data from the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) can be accessed directly from our HTTPS file system, using wget or curl. Basic command line instructions are provided in the article below.