Snow Data Assimilation System (SNODAS) Data Products at NSIDC, Version 1 (G02158)
Data set:
G02158
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This is the most recent version of these data.

Overview

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.
Data Contributor(s):
  • Tom
    Carroll
Parameter(s):
LIQUID PRECIPITATION SNOW DEPTH SNOW MELT RUNOFF AT THE BASE OF THE SNOW PACK SNOW PACK AVERAGE TEMPERATURE SNOW WATER EQUIVALENT SOLID PRECIPITATION SUBLIMATION FROM THE SNOW PACK SUBLIMATION OF BLOWING SNOW
Platform(s):
Not Specified
Sensor(s):
Not Specified
Data Format(s):
Binary
Temporal Coverage:
28 September 2003 to present
Temporal Resolution:
1 day
Spatial Resolution:
1 km
1 km
Spatial Coverage:
N:
52.8754
S:
24.9504
E:
-66.9421
W:
-124.7337
N:
53.9667
S:
24.0996
E:
-62.2504
W:
-130.5171

Data Access & Tools

Help Articles

FAQ

SNODAS is a model output, so  it is not recommended for use for quantitative water budget analysis. However, it is reasonable to sum values over a given area for a period of time, if, for example, you wanted to compare annual totals of snow water equivalent (SWE) for a given area.

Getting started

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.
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.
This is most likely due to a problem with Windows Winzip which corrupts the file upon downloading (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:

How To

This article describes the use of Geospatial Data Abstraction Library (GDAL) tools for converting SNODAS binary files to NetCDF or GeoTIFF.
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.
The NSIDC Python Reformatting and Subsetting (PyRS) tool is a command line tool which prompts the user to specify data reformatting and subsetting preferences. Output formats available are native, GeoTIFF, and NetCDF.