Level-3 25 km Brightness Temperature & Sea Ice Concentration Data Fields
The following notations are used throughout this document:
Int8 | 8-bit (1-byte) signed integer |
Int16 | 16-bit (2-byte) signed integer |
NT2 | Enhanced NASA Team algorithm |
ABA | AMSR Basic Algorithm |
North polar grids are 304 pixels by 448 pixels.
South polar grids are 316 pixels by 332 pixels.
Parameter |
Data Type |
Description |
Scale Factor |
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SI_25km_SH_06V_ASC | Int16 |
6.9 GHz vertical, daily average ascending Tbs Valid range: approximately 50 to 300 kelvin (K) |
Multiply data values by 0.1 to obtain units in kelvin (K) | ||||||||||||||
SI_25km_SH_06V_DSC | Int16 |
6.9 GHz vertical, daily average descending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_06V_DAY | Int16 |
6.9 GHz vertical, daily average Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_06H_ASC | Int16 |
6.9 GHz horizontal, daily average ascending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_06H_DSC | Int16 |
6.9 GHz horizontal, daily average descending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_06H_DAY | Int16 |
6.9 GHz horizontal, daily average Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_10V_ASC | Int16 |
10.7 GHz vertical, daily average ascending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_10V_DSC | Int16 |
10.7 GHz vertical, daily average descending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_10V_DAY | Int16 |
10.7 GHz vertical, daily average Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_10H_ASC | Int16 |
10.7 GHz horizontal, daily average ascending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_10H_DSC | Int16 |
10.7 GHz horizontal, daily average descending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_10H_DAY | Int16 |
10.7 GHz horizontal, daily average Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_18V_ASC | Int16 |
18.7 GHz vertical, daily average ascending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_18V_DSC | Int16 |
18.7 GHz vertical, daily average descending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_18V_DAY | Int16 |
18.7 GHz vertical, daily average Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_18H_ASC | Int16 |
18.7 GHz horizontal, daily average ascending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_18H_DSC | Int16 |
18.7 GHz horizontal, daily average descending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_18H_DAY | Int16 |
18.7 GHz horizontal, daily average Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_23V_ASC | Int16 |
23.8 GHz vertical, daily average ascending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_23V_DSC | Int16 |
23.8 GHz vertical, daily average descending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_23V_DAY | Int16 |
23.8 GHz vertical, daily average Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_23H_ASC | Int16 |
23.8 GHz horizontal, daily average ascending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_23H_DSC | Int16 |
23.8 GHz horizontal, daily average descending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_23H_DAY | Int16 |
23.8 GHz horizontal, daily average Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_36V_ASC | Int16 |
36.5 GHz vertical, daily average ascending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_36V_DSC | Int16 |
36.5 GHz vertical, daily average descending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_36V_DAY | Int16 |
36.5 GHz vertical, daily average Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_36H_ASC | Int16 |
36.5 GHz horizontal, daily average ascending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_36H_DSC | Int16 |
36.5 GHz horizontal, daily average descending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_36H_DAY | Int16 |
36.5 GHz horizontal, daily average Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_89V_ASC | Int16 |
89.0 GHz vertical, daily average ascending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_89V_DSC | Int16 |
89.0 GHz vertical, daily average descending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_89V_DAY | Int16 |
89.0 GHz vertical, daily average Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_89H_ASC | Int16 |
89.0 GHz horizontal, daily average ascending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_89H_DSC | Int16 |
89.0 GHz horizontal, daily average descending Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_89H_DAY | Int16 |
89.0 GHz horizontal, daily average Tbs Valid range: approximately 50 to 300 K |
Multiply data values by 0.1 to obtain units in K | ||||||||||||||
SI_25km_SH_ICECON_ASC | Int16 | Sea ice concentration, daily ascending average
|
N/A | ||||||||||||||
SI_25km_SH_ICECON_DSC | Int16 | Sea ice concentration daily descending average
|
N/A | ||||||||||||||
SI_25km_SH_ICECON_DAY | Int16 | Sea ice concentration daily average
|
N/A | ||||||||||||||
SI_25km_SH_ICEDIFF_ASC | Int16 | Sea ice concentration daily ascending average, using the difference between ABA and NT2 algorithms
|
N/A | ||||||||||||||
SI_25km_SH_ICEDIFF_DSC | Int16 | Sea ice concentration daily descending average, using the difference between ABA and NT2 algorithms
|
N/A | ||||||||||||||
SI_25km_SH_ICEDIFF_DAY | Int16 | Sea ice concentration daily average, using the difference between ABA and NT2 algorithms
|
N/A | ||||||||||||||
* Positive values 1 to 100% represent the difference in concentration where NT2 is greater than BBA and negative values -1 to -100% represent the difference in concentration where BBA is greter than NT2. **The difference values need input from both the NT2 and ABA sea ice concentration algorithms. These new values indicate when one of these is missing. If there is a valid ABA value and missing NT2, it takes on the value 200+ABA. Like wise, a valid NT2 and missing ABA takes on the value -200-NT2. A difference value of 200 means the ABA was open water and the NT2 was missing; a value of 225 means the ABA was 25% and the NT2 was missing. So I guess a value of 300 means ABA was 100 and NT2 was missing. The normal range of difference values is -100 to 100. |