BOREAS HYD-02 Estimated Snow Water Equivalent (SWE) from Microwave
Measurements

7.3 Data Characteristics

7.3.1 Parameter/Variable

The parameters contained in the data files are:

     Column Name
---------------------------------------
GMT
AMMR_18V
AMMR_18H
AMMR_37V
AMMR_37H
AMMR_92V
AMMR_92H
SWE
Evnt
RadAlt
PsAlt
AcLat
AcLon
FtpLat
FtpLon
AirSpd
GrSpd
Hdg
WinDir
WinSpd
AirTemp
DewPt
PRT5
SolarIn
AcPitch
AcRoll
XOff
YOff

7.3.2 Variable Description/Definition

The descriptions of the parameters contained in the data files are:

    Column Name                        Description
--------------------    ------------------------------------------------------

GMT                      Greenwich mean time     
AMMR_18V                 18 GHz brightness temperature (Vertical)
AMMR_18H                 18 GHz brightness temperature (Horizontal)
AMMR_37V                 37 GHz brightness temperature (Vertical)
AMMR_37H                 37 GHz brightness temperature (Horizontal)
AMMR_92V                 92 GHz brightness temperature (Vertical)
AMMR_92H                 92 GHz brightness temperature (Horizontal)
SWE                      Estimated snow water equivalent
Evnt                     Flight line marker      
RadAlt                   Radar altitude          
PsAlt                    Pressure altitude       
AcLat                    Latitude of aircraft    
AcLon                    Longitude of aircraft   
FtpLat                   Latitude of measurement location   
FtpLon                   Longitude of measurement location  
AirSpd                   True air speed          
GrSpd                    Ground speed            
Hdg                      Aircraft heading        
WinDir                   Wind direction
WinSpd                   Wind speed                   
AirTemp                  Air temperature         
DewPt                    Dewpoint temperature    
PRT5                     IR surface temperature  
SolarIn                  Solar intensity upon surface        
AcPitch                  Aircraft pitch angle    
AcRoll                   Aircraft roll angle     
XOff                     X-offset between aircraft and measurement location
YOff                     Y-offset between aircraft and measurement location

7.3.3 Unit of Measurement

The measurement units for the parameters contained in the data files are:

      Column Name                        Units
--------------------------    ------------------------------------------------

GMT                           [Hr:Min:Sec]      
AMMR_18V                      [Kelvin]
AMMR_18H                      [Kelvin]               
AMMR_37V                      [Kelvin]              
AMMR_37H                      [Kelvin]               
AMMR_92V                      [Kelvin]               
AMMR_92H                      [Kelvin]               
SWE                           [millimeters]              
Evnt                          1 = flight line
                              0 = non-flight line
RadAlt                        [meters]               
PsAlt                         [meters]               
AcLat                         [degrees of latitude]             
AcLon                         [degrees of longitude]             
FtpLat                        [degrees of latitude]             
FtpLon                        [degrees of longitude]             
AirSpd                        [meters second^-1]             
GrSpd                         [meters second^-1]             
Hdg                           [degrees]             
WinDir                        [degrees]             
WinSpd                        [meters][second^-1]             
AirTemp                       [degrees Celsius]               
DewPt                         [degrees Celsius]               
PRT5                          [degrees Celsius]               
SolarIn                       [Watts][meter^-2]
AcPitch                       [degrees]             
AcRoll                        [degrees]             
XOff                          [meters]               
YOff                          [meters]               

7.3.4 Data Source

The source of the parameter values contained in the data files are:

      Column Name                                 Source
-------------------------     ------------------------------------------------

GMT                           WWV radio station             
AMMR_18V                      radiometer      
AMMR_18H                      radiometer      
AMMR_37V                      radiometer      
AMMR_37H                      radiometer      
AMMR_92V                      radiometer      
AMMR_92H                      radiometer      
SWE                           inferred        
Evnt                          investigator
RadAlt                        radar           
PsAlt                         Barometer       
AcLat                         GPS             
AcLon                         GPS             
FtpLat                        GPS             
FtpLon                        GPS             
AirSpd                        INS             
GrSpd                         INS             
Hdg                           INS             
WinDir                        INS             
WinSpd                        INS             
AirTemp                       Rosemount       
DewPt                         Hygrometer
PRT5                          Barnes PRT5     
SolarIn                       Pyrometer
AcPitch                       INS             
AcRoll                        INS             
XOff                          GPS             
YOff                          GPS

7.3.5 Data Range

The range of parameter values contained in the data files are:

      Column Name                               Range
-------------------------     ------------------------------------------------

GMT                           00:00:00 - 23:59:59
18V                           0-300
AMMR_18H                      0-300
AMMR_37V                      0-300
AMMR_37H                      0-300
AMMR_92V                      0-300
AMMR_92H                      0-300
SWE                           0-250
Evnt                          0-1
RadAlt                        None given.
PsAlt                         None given.
AcLat                         None given.
AcLon                         None given.
FtpLat                        None given.
FtpLon                        None given.
AirSpd                        0-150 
GrSpd                         0-150 
Hdg                           0-360
WinDir                        0-360
WinSpd                        0-200
AirTemp                       None given.
DewPt                         None given.
PRT5                          None given.
SolarIn                       None given.
AcPitch                       -90 to 90
AcRoll                        -90 to 90
XOff                          None given.
YOff                          None given.


7.4  Sample Record

The following are wrapped versions of data records from one of the data files:

GMT,AMMR_18V,AMMR_18H,AMMR_37V,AMMR_37H,AMMR_92V,AMMR_92H,SWE,Evnt,RadAlt,
PsAlt,AcLat,AcLon,FtpLat,FtpLon,AirSpd,GrSpd,Hdg,WinDir,WinSpd,AirTemp,DewPt,
PRT5,SolarIn,AcPitch,AcRoll,XOff,YOff
19:57:41,,,,,,,,0,2,429,53.2178,105.684,53.2178,105.684,-0.4,0.2,89,251,0.4,-2
,-11.7,-15.3,297,-0.8,-0.4,0,-2
19:57:42,,,,,,,,0,2,429,53.2178,105.684,53.2178,105.684,-0.4,0.2,89,251,0.4,-2
,-11.8,-15.3,297,-1,-0.5,0,-2
19:57:43,,,,,,,,0,2,429,53.2178,105.684,53.2178,105.684,-0.4,0.2,89,251,0.4,-1
.9,-11.8,-15.3,297,-1.1,-0.5,0,-2
