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USER GUIDE: AMSR-E/Aqua L2B Surface Soil Moisture, Ancillary Parms, & QC EASE-Grids, Version 3
Page 3 of 17
National Snow and Ice Data Center
nsidc.org
“Combined NPD and SCA Output Fields” is structured as a table (as opposed to a 2D array or
grid) in which each column is a parameter whose values have one of the following data types:
• Float64: 64-bit (8-byte) floating-point integer
• Float32: 32-bit (4-byte) floating-point integer
• Int32: 32-bit (4-byte) signed integer
Table 1 describes each column in the “Combined NPD and SCA Output Fields” data table. Note
that columns 21 – 35 contain variables which capture the number of footprints within each grid cell
that satisfy a given ambient surface condition. For more information about these variables, see
“Section 2.2.3 | Ambient Surface Conditions.”
Table 1. Column Names and Descriptions for “Combined NPD and SCA Output Fields”
Col # Col Title (Parameter Name) Type Description Units
Fill
1 Time Float64
Scan start time in International
Atomic Time in seconds with 01
January 1993 00:00:00 as the
zero base (TAI93).
Seconds n/a
2 Latitude Float32
Latitude of the center of a 25-
km EASEv1-Grid cell (-90.0 to
90.0)
degrees
99 /
98
3 Longitude Float32
Longitude of the center of a 25-
km EASEv1-Grid cell (-180.0 to
180.0)
degrees
999 /
998
4 RowIndex Int32 EASE-Grid row index (1-586) n/a -9999
5 ColumnIndex Int32
EASE-Grid column index (0-
1382)
n/a -9999
6 TBH10r2 Float32
10.7 GHz H-polarized
brightness temperature (T
b
)
K -9999
7 TBV10r2 Float32 10.7 GHz V-polarized T
b
K -9999
8 TBH18r2 Float32 18.7 GHz H-polarized T
b
K -9999
9 TBV18r2 Float32 18.7 GHz V-polarized T
b
K -9999
10 TBH23r2 Float32 23.8 GHz H-polarized T
b
K -9999
11 TBV23r2 Float32 23.8 GHz V-polarized T
b
K -9999
12 TBH36r2 Float32 36.5 GHz H-polarized T
b
K -9999
13 TBV36r2 Float32 36.5 GHz V-polarized T
b
K -9999
14 TBH89r2 Float32 89.0 GHz H-polarized T
b
K -9999
15 TBV89r2 Float32 89.0 GHz V-polarized T
b
K -9999
16 VegetationRoughnessNPD Float32 Vegetation roughness n/a -9999