You can use this interface to get file-level, on-the-fly browse access to selected NSIDC data sets and immediate access to the data as it is archived at NSIDC. You can also reformat, reproject, and subset the data on-the-fly, with live downloads available via the data queue as soon as your request is completed.
We welcome comments and questions about the system. Please contact the NSIDC User Services Office either by filling out a contact form, by e-mail to email@example.com, or by telephone at +1 303-492-6199.
If you just downloaded the data without reformatting, subsetting, or reprojecting it, then the data set documentation will give you adequate data set information, such as how the data are stored on our archive. The tarball that you downloaded will contain a file called 00README.txt that includes a link to the data set documentation for the data you downloaded. You can also find a link to the data set documentation on the Results tab or the Results Explorer pop-up, where the data set title is a link to the data set documentation.
However, if you requested data to be reformatted, subsetted, or reprojected, then you will need information about the operations that were performed on your data. If you requested binary data, each downloaded file will be accompanied by a text file with the same name as the binary file with file extension.txt. This file will contain information describing columns/rows, element size, corner coordinates and the operations performed on the data. If you requested netCDF or geoTIFF data, this information is included in the netCDF or geoTIFF file metadata.
From the Search tab, use the Geospatial field to narrow your search to a specific geospatial area. If you do not make a geospatial selection, the default is to search the whole globe. If you limit your search to a specific area, the search will return all available data that intersect with your selected area.
To modify the geospatial fields, use the Choose View option buttons North Polar, Global, or South Polar to change the view of the map. The North and South polar view maps work well for searches that cross or are near the poles. The global view map works well for searches that cross the equator.
After selecting a map view, modify the geospatial fields to specify your area of interest, or use your mouse directly on the map to draw a bounding box by clicking and dragging.
The North Polar and South Polar map views use corner points in lat/lon pairs to define the area of a box. You only need to define the upper left and bottom right corners in lat/lon pairs (the white text boxes) to create your area. The other two corners (the grey text boxes that do not allow you to enter text) are created automatically based on the box drawn.
The Global map view uses lat/lon bounds (northernmost, southernmost, westernmost, and easternmost) to define the area of a box. If you use the mouse to draw the area on the map, the fields are filled in automatically, based on the box drawn.
To reset the map, click on the Reset Map & Selection button.
Use the Data Sets and Variables lists to restrict your search to a specific data set and variable combination. If you do not make a selection, then all available data sets and/or variables will be searched.
Example: If you select only Brightness Temperature, your search will look for any data sets with Brightness Temperature fields.
No, you cannot currently access all of NSIDC's data here. See the Data Sets list located on the Search page for the data sets that we currently support. We are working to serve more data sets in a release planned for 2010. If you are looking for a data set that is not currently supported, please contact the NSIDC User Services Office, either by filling out a contact form, by e-mail to firstname.lastname@example.org, or by telephone at +1 303-492-6199.
The data formats that are available are determined by the data set. Thus, the available data formats for a data set are listed in the Download Format pull-down menu located in the Configuration Download popup window. Depending on the data set, we currently support the archived format plus GeoTIFF, NetCDF, binary, and ASCII. We are adding formats over time, so if you would like to see a specific format available, please let us know.
The projections that are available are determined by data set. The available download projections for the data set you have chosen will be listed in the Output Grid and Projection pull-down menu of the Configuration Download popup window. We are adding projections over time, so if you you would like to see a specific projection available, please let us know.
Sometimes a single file can contain data collected from more then one day. For instance, SNODAS files contain data aggregated over a 24 hour period (6:00 a.m to 6:00 a.m.) and have a time stamp in the file name which reflects the end of the data aggregation period. If a request is made for data on January 5, 2004 two files will be delivered. The first file will have a time stamp of January 5, 2004 at 5:00 a.m. and will contain data from January 4, 2004 at 6:00 a.m. to January 5, 2004 at 5:00 a.m. The second file will have a time stamp of January 6, 2004 at 5:00 a.m. and will contain data from January 5, 2004 at 6:00 a.m. to January 6, 2004 at 5:00 a.m.
Your job may be taking a long time to complete for any of the following reasons:
The job is large due to the number of files, or due to increased processing to reformat, subset, or reproject the data.
There are other jobs in the system processing at the same time.
If your job is being processed, the data queue provides a status bar indicating the job processing progress. If the status bar does not change in 15 minutes, please contact NSIDC User Services Office either by filling out a contact form, by e-mail to email@example.com, or by telephone at +1 303-492-6199.
If your job is waiting to be processed, the data queue will indicate a waiting status.
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