Data Set ID: 

Snow Data Assimilation System (SNODAS) Data Products at NSIDC, Version 1

This data set contains snow pack properties, such as depth and snow water equivalent (SWE), from the NOAA National Weather Service's National Operational Hydrologic Remote Sensing Center (NOHRSC) SNOw Data Assimilation System (SNODAS). SNODAS is a modeling and data assimilation system developed by NOHRSC to provide the best possible estimates of snow cover and associated parameters to support hydrologic modeling and analysis.

This is the most recent version of these data.

  • Precipitation > Rain > LIQUID PRECIPITATION
  • Snow/Ice > Snow Depth > SNOW DEPTH
  • SNOW/ICE > SNOW MELT > Snow Melt Runoff at the Base of the Snow Pack
  • Snow/Ice > Snow/Ice Temperature > Snow Pack Average Temperature
  • Snow/Ice > Snow Water Equivalent > SNOW WATER EQUIVALENT
  • Precipitation > Solid Precipitation > SOLID PRECIPITATION
  • Atmospheric Water Vapor > Sublimation > Sublimation from the Snow Pack
  • Atmospheric Water Vapor > Sublimation > Sublimation of Blowing Snow
Data Format(s):
  • Binary
Spatial Coverage:
N: 53.9667, 
N: 52.8754, 
S: 24.0996, 
S: 24.9504, 
E: -62.2504, 
E: -66.9421, 
W: -130.5171
W: -124.7337
Platform(s):Not specified
Spatial Resolution:
  • 1 km x 1 km
Sensor(s):Not specified
Temporal Coverage:
  • 28 September 2003
Temporal Resolution1 dayMetadata XML:View Metadata Record
Data Contributor(s):Tom Carroll

Geographic Coverage

Would you like to receive updates and notifications regarding this data set? Subscribe below and stay informed. PLEASE NOTE: You only need to fill this form out once.

FTP data can be downloaded through a Web browser (Firefox or Edge are recommended) or command line via FTP. For help downloading data through an FTP client, go to the How to access data using an FTP client support page.

As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

National Operational Hydrologic Remote Sensing Center. 2004. Snow Data Assimilation System (SNODAS) Data Products at NSIDC, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: [Date Accessed].

It appears your Web browser is not configured to display PDF files. Download adobe Acrobat or click here to download the PDF file.


When visualizing SNODAS data, why is the image skewed?
This is most likely due to a problem with Windows Winzip which corrupts the file upon dowloading (you will see that the file size will have changed from the original located on ftp) You can correct this by changing some settings in WinZip: Extract the “.tar.gz” file using WinZip. The WinZip... read more
How can I find information about the model input for the SNODAS data set?
NOHRSC provides/creates the data, we just archive it. If you have questions about the model (such as how it is run) that are not available in the user guide, you have to contact NOHRSC directly.
What if I need SNODAS data in real or neal-real time?
NSIDC has scripts that run several times a day. If new SNODAS files are found, these scripts will automatically post them to our FTP server. If you need data sooner than the normal timeframe that NSIDC uploads files to our FTP site, you can contact... read more

How To

How do I import SNODAS data into ArcGIS?
Follow the steps below, which are also linked from the SNODAS user guide. These steps will work for all eight SNODAS variables in ArcGIS 10.0 or higher. Before working through the rest of this tutorial, we would like to make you aware of a small spatial... read more
How do I convert SNODAS binary files to GeoTIFF or NetCDF?
This article will describe the use of Geospatial Data Abstraction Library (GDAL) tools for converting SNODAS binary files to NetCDF or GeoTIFF. Before working through the rest of this tutorial, we would like to make you aware of a small spatial data shift that occurs... read more
Subsetting and Reformatting with the NSIDC PyRS Docker Container
What is PyRS?   The NSIDC Python Reformatting and Subsetting (PyRS) tool is a user prompt command line tool for data reformatting and subsetting. PyRS is designed to work with select datasets in binary format: Sea Ice Concentrations from Nimbus-7 SMMR... read more