How do I import SNODAS data into ArcGIS?

Follow the steps below (which are also linked to the data set documentation). These steps will work for all 8 SNODAS variables using ArcGIS 10.0 or higher.

This example imports snow depth data from March 1, 2015.

filename= us_ssmv01025SlL00T0024TTNATS2015030105DP001.dat


1. Create the following header file and give it the same name as "filename" but with a .hdr extentsion. Remember to place in the same directory as "filename.dat"

For masked data (files beginning with 'us'):

nrows 3351
ncols 6935
nbands 1
nbits 16
pixeltype signedint
byteorder M
layout dat
ulxmap -124.729583333331703
ulymap 52.871249516804028
xdim 0.00833333333
ydim 0.00833333333 

For unmasked data (files beginning with 'zz'):

nrows 4096
ncols 8192
nbands 1
nbits 16
pixeltype signedint
byteorder M
layout dat
ulxmap -130.517083333328
ulymap 58.2329166666644
xdim 0.00833333333
ydim 0.00833333333 

2. Start ArcMap and click on the 'Add Data' icon located in the main toolbar. Browse, select, and open the .dat file to the map document. To add the file in a different format, follow step 3.


3. Start ArcMap and open ArcToolbox. Select Conversion Tools > To Raster > Raster to Other Format. The Raster to Other Format window will appear. In the Input Raster box, browse and select the .dat file. In the Output Workspace box, select the location to store the new data set. In the Output Format box, select the format you wish to create (e.g. TIFF, ENVI DAT, etc.). Click OK.