BOREAS RSS-02 Extracted Reflectance Factors Derived from ASAS Imagery

7.3 Data Characteristics

7.3.1 Parameter/Variable

The parameters contained in the data files are:

Reference File
         Column Name
------------------------------
SITE_NAME
SUB_SITE
DATE_OBS
TIME
C130_LINE_NUM
C130_RUN_NUM
PLATFORM_ALTITUDE
C130_TRUE_HEADING
RELATIVE_SOLAR_POSITION
SOLAR_ZEN_ANG
SOLAR_AZ_ANG
CENTER_VIEW_ZEN_ANG
CENTER_VIEW_AZ_ANG
RELATIVE_VIEW_AZ_ANG
ASAS_EXTRACTION_START_LINE
ASAS_EXTRACTION_START_SAMPLE
ASAS_EXTRACTION_END_LINE
ASAS_EXTRACTION_END_SAMPLE
COLUMN_WATER_VAPOR_6S
OZONE_CONTENT_6S
INTERP_AEROSOL_OPT_THICK_550
EST_BELOW_PLATFORM_WATER_VAPOR
EST_BELOW_PLATFORM_OZONE
EST_BELOW_PLATFORM_AOT_550
CRTFCN_CODE
REVISION_DATE

Data File
         Column Name
------------------------------
SITE_NAME
SUB_SITE
DATE_OBS
TIME
WAVELENGTH
ASAS_CHANNEL_NUM
CENTER_VIEW_ZEN_ANG
MEAN_RADIANCE
SDEV_RADIANCE
MEAN_SURF_RAD
SDEV_SURF_RAD
MEAN_SURF_REFL
SDEV_SURF_REFL
DIRECT_DOWN_SOLAR_IRRAD
DIFFUSE_DOWN_SOLAR_IRRAD
ENV_DOWN_SOLAR_IRRAD
CRTFCN_CODE
REVISION_DATE

7.3.2 Variable Description/Definition

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

Reference File
         Column Name                             Description
------------------------------ ------------------------------------------------
SITE_NAME                      The identifier assigned to the site by BOREAS, 
                               in the format SSS-TTT-CCCCC, where SSS identifies
                               the portion of the study area: NSA, SSA, REG, 
                               TRN, and TTT identifies the cover type for the
                               site, 999 if unknown, and CCCCC is the identifier
                               for site, exactly what it means will vary with 
                               site type.
SUB_SITE                       The identifier assigned to the sub-site by 
                               BOREAS, in the format GGGGG-IIIII, where GGGGG is 
                               the group associated with the sub-site 
                               instrument e.g. HYD06 or STAFF, and IIIII is the 
                               identifier for sub-site, often this will refer to 
                               an instrument.
DATE_OBS                       The date on which the data were collected.
TIME                           The Greenwich Mean Time (GMT) when the data were
                               collected.
C130_LINE_NUM                  The number of the C130 line in its flights over
                               the BOREAS area as given in the flight logs.  
                               Zero values are given for non-"official" C130 
                               missions and for data between C130 sites or 
                               lines.
C130_RUN_NUM                   The number of the C130 run in its flights over 
                               the BOREAS area as given in the flight logs.  
                               Zero value is given for non-"official" C130 
                               missions and data between C130 sites, lines or 
                               runs.
PLATFORM_ALTITUDE              The nominal altitude of the data collection 
                               platform above the target.
C130_TRUE_HEADING              The nominal azimuthal direction, measured 
                               clockwise from North, along which the center line 
                               of the C-130 aircraft was aligned during the 
                               flight.
RELATIVE_SOLAR_POSITION        The relative position of the aircraft flight line
                               to the solar position, the values being either
                               parallel, perpendicular, or oblique.
SOLAR_ZEN_ANG                  The angle from the surface normal (straight up)
                               to the sun during the data collection.
SOLAR_AZ_ANG                   The azimuthal direction of the sun during data 
                               collection expressed in clockwise increments from
                               North.
CENTER_VIEW_ZEN_ANG            At the center of the scene, the angle from the 
                               surface normal (straight up) to the observing 
                               instrument.
CENTER_VIEW_AZ_ANG             The azimuthal direction in which the radiant 
                               energy was traveling when collected by the 
                               instrument and expressed in clockwise increments 
                               from North.
RELATIVE_VIEW_AZ_ANG           The azimuthal angle at which the radiant energy
                               was traveling when measured by the sensor, 
                               relative to the solar azimuth.  The relative view 
                               azimuth angle increases in a clockwise direction 
                               from the solar position.
ASAS_EXTRACTION_START_LINE     The starting line in the ASAS image from which 
                               values were extracted to derive BRDF estimations.
ASAS_EXTRACTION_START_SAMPLE   The starting sample in the ASAS image from which
                               values were extracted to derive BRDF estimations.
ASAS_EXTRACTION_END_LINE       The ending line in the ASAS image from which 
                               values were extracted to derive BRDF estimations.
ASAS_EXTRACTION_END_SAMPLE     The ending sample in the ASAS image from which 
                               values were extracted to derive BRDF estimations.
COLUMN_WATER_VAPOR_6S          The modeled amount of precipitable water in the
                               total vertical column of air with a cross-section 
                               of 1 centimeter squared output from the 6S 
                               atmospheric model.
OZONE_CONTENT_6S               The modeled total column abundance of ozone, 
                               output from the 6S atmospheric model.
INTERP_AEROSOL_OPT_THICK_550   The aerosol optical depth interpolated to 550 
                               nanometers, used in the atmospheric correction.
EST_BELOW_PLATFORM_WATER_VAPOR The estimated amount of precipitable water 
                               within a vertical column of air between the 
                               ground and the aircraft, with a cross-section of 
                               1 centimeter squared (modeled).
EST_BELOW_PLATFORM_OZONE       The estimated column abundance of ozone below 
                               the aircraft (modeled).
EST_BELOW_PLATFORM_AOT_550     The estimated aerosol optical depth for the air
                               column below the aircraft (modeled).
CRTFCN_CODE                    The BOREAS certification level of the data.  
                               Examples are CPI (Checked by PI), CGR (Certified 
                               by Group), PRE (Preliminary), and CPI-??? (CPI 
                               but questionable).
REVISION_DATE                  The most recent date when the information in the
                               referenced data base table record was revised.

Data File
         Column Name                             Description
------------------------------ ------------------------------------------------
SITE_NAME                      The identifier assigned to the site by BOREAS, 
                               in the format SSS-TTT-CCCCC, where SSS identifies
                               the portion of the study area: NSA, SSA, REG, 
                               TRN, and TTT identifies the cover type for the
                               site, 999 if unknown, and CCCCC is the identifier
                               for site, exactly what it means will vary with 
                               site type.
SUB_SITE                       The identifier assigned to the sub-site by 
                               BOREAS, in the format GGGGG-IIIII, where GGGGG is 
                               the group associated with the sub-site 
                               instrument e.g. HYD06 or STAFF, and IIIII is the 
                               identifier for sub-site, often this will refer to 
                               an instrument.
DATE_OBS                       The date on which the data were collected.
TIME                           The Greenwich Mean Time (GMT) when the data were
                               collected.
WAVELENGTH                     Spectral wavelength at which measurement was
                               acquired.
ASAS_CHANNEL_NUM               The ASAS designation for channel number, 
                               sequential from 1 to 62.
CENTER_VIEW_ZEN_ANG            At the center of the scene, the angle from the 
                               surface normal (straight up) to the observing 
                               instrument.
MEAN_RADIANCE                  The mean at-sensor radiance.
SDEV_RADIANCE                  The standard deviation of at-sensor radiance.
MEAN_SURF_RAD                  The mean atmospherically corrected surface 
                               radiance
SDEV_SURF_RAD                  The standard deviation of atmospherically 
                               corrected surface radiance
MEAN_SURF_REFL                 The mean surface reflectance factor 
                               (atmospherically corrected).
SDEV_SURF_REFL                 The standard deviation of atmospherically 
                               corrected surface reflectance factor
DIRECT_DOWN_SOLAR_IRRAD        Downwelling solar spectral irradiance from 6S 
                               model; direct component reaches surface on first 
                               sun-surface path without scattering.
DIFFUSE_DOWN_SOLAR_IRRAD       Downwelling solar spectral irradiance from 6S 
                               model; diffuse component is the scattered flux 
                               on the first sun-surface path, independent of 
                               surface properties.
ENV_DOWN_SOLAR_IRRAD           Downwelling solar spectral irradiance from 6S 
                               model; environmental component has been scattered
                               between the surface and atmosphere and thus is 
                               dependent on surface albedo.
CRTFCN_CODE                    The BOREAS certification level of the data.  
                               Examples are CPI (Checked by PI), CGR (Certified 
                               by Group), PRE (Preliminary), and CPI-??? (CPI 
                               but questionable).
REVISION_DATE                  The most recent date when the information in the
                               referenced data base table record was revised.

7.3.3 Unit of Measurement

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

Reference File
         Column Name                                Units
------------------------------ ------------------------------------------------
SITE_NAME                      [none]
SUB_SITE                       [none]
DATE_OBS                       [DD-MON-YYYY]
TIME                           [HHMMSS GMT]
C130_LINE_NUM                  [none]
C130_RUN_NUM                   [none]
PLATFORM_ALTITUDE              [meters]
C130_TRUE_HEADING              [degrees]
RELATIVE_SOLAR_POSITION        [none]
SOLAR_ZEN_ANG                  [degrees]
SOLAR_AZ_ANG                   [degrees]
CENTER_VIEW_ZEN_ANG            [degrees]
CENTER_VIEW_AZ_ANG             [degrees]
RELATIVE_VIEW_AZ_ANG           [degrees]
ASAS_EXTRACTION_START_LINE     [none]
ASAS_EXTRACTION_START_SAMPLE   [none]
ASAS_EXTRACTION_END_LINE       [none]
ASAS_EXTRACTION_END_SAMPLE     [none]
COLUMN_WATER_VAPOR_6S          [millimeters]
OZONE_CONTENT_6S               [Dobson units]
INTERP_AEROSOL_OPT_THICK_550   [unitless]
EST_BELOW_PLATFORM_WATER_VAPOR [millimeters]
EST_BELOW_PLATFORM_OZONE       [Dobson units]
EST_BELOW_PLATFORM_AOT_550     [unitless]
CRTFCN_CODE                    [none]
REVISION_DATE                  [DD-MON-YYYY]

Data File
         Column Name                                Units
------------------------------ ------------------------------------------------
SITE_NAME                      [none]
SUB_SITE                       [none]
DATE_OBS                       [DD-MON-YYYY]
TIME                           [HHMMSS GMT]
WAVELENGTH                     [micrometers]
ASAS_CHANNEL_NUM               [none]
CENTER_VIEW_ZEN_ANG            [degrees]
MEAN_RADIANCE                  [Watts][meter^-2][steradian^-1][micrometer^-1]
SDEV_RADIANCE                  [Watts][meter^-2][steradian^-1][micrometer^-1]
MEAN_SURF_RAD                  [Watts][meter^-2][steradian^-1][micrometer^-1]
SDEV_SURF_RAD                  [Watts][meter^-2][steradian^-1][micrometer^-1]
MEAN_SURF_REFL                 [percent]
SDEV_SURF_REFL                 [percent]
DIRECT_DOWN_SOLAR_IRRAD        [Watts][meter^-2][micrometer^-1]
DIFFUSE_DOWN_SOLAR_IRRAD       [Watts][meter^-2][micrometer^-1]
ENV_DOWN_SOLAR_IRRAD           [Watts][meter^-2][micrometer^-1]
CRTFCN_CODE                    [none]
REVISION_DATE                  [DD-MON-YYYY]

7.3.4 Data Source

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

Reference File
         Column Name                             Data Source
------------------------------ ------------------------------------------------
SITE_NAME                      [Assigned by BORIS Staff]
SUB_SITE                       [Assigned by BORIS Staff]
DATE_OBS                       [ASAS data system (recorded with data)]
TIME                           [ASAS data system (recorded with data)]
C130_LINE_NUM                  [ASAS flight logs]
C130_RUN_NUM                   [ASAS flight logs]
PLATFORM_ALTITUDE              [C130 navigation information]
C130_TRUE_HEADING              [C130 navigation information]
RELATIVE_SOLAR_POSITION        [ASAS data system (recorded with data)]
SOLAR_ZEN_ANG                  [Calculated by ASAS software]
SOLAR_AZ_ANG                   [Calculated by ASAS software]
CENTER_VIEW_ZEN_ANG            [ASAS data system (recorded with data)]
CENTER_VIEW_AZ_ANG             [Calculated by ASAS data system software]
RELATIVE_VIEW_AZ_ANG           [Calculated by ASAS data system software]
ASAS_EXTRACTION_START_LINE     [Obtained in image analysis software]
ASAS_EXTRACTION_START_SAMPLE   [Obtained in image analysis software]
ASAS_EXTRACTION_END_LINE       [Obtained in image analysis software]
ASAS_EXTRACTION_END_SAMPLE     [Obtained in image analysis software]
COLUMN_WATER_VAPOR_6S          [Modeled and output by 6S]
OZONE_CONTENT_6S               [Modeled and output by 6S]
INTERP_AEROSOL_OPT_THICK_550   [Interpolated from BORIS RSS11 and RSS12 
                                datasets, then input to 6S]
EST_BELOW_PLATFORM_WATER_VAPOR [Modeled and output by 6S]
EST_BELOW_PLATFORM_OZONE       [Modeled and output by 6S]
EST_BELOW_PLATFORM_AOT_550     [Modeled and output by 6S]
CRTFCN_CODE                    [Assigned by BORIS Staff]
REVISION_DATE                  [Assigned by BORIS Staff]

Data File
         Column Name                             Data Source
------------------------------ ------------------------------------------------
SITE_NAME                      [Assigned by BORIS Staff]
SUB_SITE                       [Assigned by BORIS Staff]
DATE_OBS                       [ASAS data system (recorded with data)]
TIME                           [ASAS data system (recorded with data)]
WAVELENGTH                     [ASAS spectral response files]
ASAS_CHANNEL_NUM               [ASAS software]
CENTER_VIEW_ZEN_ANG            [Calculated by ASAS data system software]
MEAN_RADIANCE                  [Calculated by image analysis software]
SDEV_RADIANCE                  [Calculated by image analysis software]
MEAN_SURF_RAD                  [6S output]
SDEV_SURF_RAD                  [ASAS software that runs 6S]
MEAN_SURF_REFL                 [6S output]
SDEV_SURF_REFL                 [ASAS software that runs 6S]
DIRECT_DOWN_SOLAR_IRRAD        [6S output]
DIFFUSE_DOWN_SOLAR_IRRAD       [6S output]
ENV_DOWN_SOLAR_IRRAD           [6S output]
CRTFCN_CODE                    [Assigned by BORIS Staff]
REVISION_DATE                  [Assigned by BORIS Staff]

7.3.5  Data Range

The following table gives information about the parameter values found in
the data files.

Reference File
                     Minimum        Maximum        Missng  Unrel  Below   Data
                     Data           Data           Data    Data   Detect  Not
Column Name          Value          Value          Value   Value  Limit   Cllctd
--------------------------------------------------------------------------------
SITE_NAME            NSA-FEN-FLXTR  SSA-YJP-FLXTR  None    None   None    None
SUB_SITE             RSS02-BRF01    RSS02-BRF01    None    None   None    None
DATE_OBS             26-MAY-1994    20-JUL-1996    None    None   None    None
TIME                 153838         211436         None    None   None    None
C130_LINE_NUM        101            703            None    None   None    None
C130_RUN_NUM         1              2              None    None   None    None
PLATFORM_ALTITUDE    5130           6177           None    None   None    None
C130_TRUE_HEADING    19             340            None    None   None    None
RELATIVE_SOLAR_      oblique        perpendicular  None    None   None    None
POSITION
SOLAR_ZEN_ANG        33.5           46             None    None   None    None
SOLAR_AZ_ANG         117.9          229.4          None    None   None    None
CENTER_VIEW_ZEN_ANG  .3             70             None    None   None    None
CENTER_VIEW_AZ_ANG   18.2           351.2          None    None   None    None
RELATIVE_VIEW_AZ_ANG 1.27           359.059        None    None   None    None
ASAS_EXTRACTION_     22             1809           None    None   None    None
START_LINE
ASAS_EXTRACTION_     22             489            None    None   None    None
START_SAMPLE
ASAS_EXTRACTION_END_ 36             1823           None    None   None    None
LINE
ASAS_EXTRACTION_END_ 38             504            None    None   None    None
SAMPLE
COLUMN_WATER_VAPOR_  14.2           14.2           None    None   None    None
6S
OZONE_CONTENT_6S     340            340            None    None   None    None
INTERP_AEROSOL_OPT_  .054           .09            None    None   None    None
THICK_550
EST_BELOW_PLATFORM_  10.45          12.16          None    None   None    None
WATER_VAPOR
EST_BELOW_PLATFORM_  10             10             None    None   None    None
OZONE
EST_BELOW_PLATFORM_  .05            .086           None    None   None    None
AOT_550
CRTFCN_CODE          CPI            CPI            None    None   None    None
REVISION_DATE        19-JAN-1999    25-FEB-1999    None    None   None    None
--------------------------------------------------------------------------------

Data File
                     Minimum        Maximum        Missng  Unrel  Below   Data
                     Data           Data           Data    Data   Detect  Not
Column Name          Value          Value          Value   Value  Limit   Cllctd
--------------------------------------------------------------------------------
SITE_NAME            NSA-FEN-FLXTR  SSA-YJP-FLXTR  None    None   None    None
SUB_SITE             RSS02-BRF01    RSS02-BRF01    None    None   None    None
DATE_OBS             26-MAY-1994    20-JUL-1996    None    None   None    None
TIME                 153838         211436         None    None   None    None
WAVELENGTH           .4043          1.0227         None    None   None    None
ASAS_CHANNEL_NUM     1              62             None    None   None    None
CENTER_VIEW_ZEN_ANG  .3             70             None    None   None    None
MEAN_RADIANCE        1.806          128.437        None    None   None    None
SDEV_RADIANCE        .19            40.753         None    None   None    None
MEAN_SURF_RAD        0              130.893        None    None   None    None
SDEV_SURF_RAD        0              41.955         None    None   None    None
MEAN_SURF_REFL       0              67.9           None    None   None    None
SDEV_SURF_REFL       0              25.1           None    None   None    None
DIRECT_DOWN_SOLAR_   214.688        1212.9         None    None   None    None
IRRAD
DIFFUSE_DOWN_SOLAR_  7.84           293.149        None    None   None    None
IRRAD
ENV_DOWN_SOLAR_IRRAD 0              20.063         None    None   None    None
CRTFCN_CODE          CPI            CPI            None    None   None    None
REVISION_DATE        15-JAN-1999    15-JAN-1999    None    None   None    None
--------------------------------------------------------------------------------
Minimum Data Value -- The minimum value found in the column.
Maximum Data Value -- The maximum value found in the column.
Missng Data Value  -- The value that indicates missing data. This is used to
                      indicate that an attempt was made to determine the
                      parameter value, but the attempt was unsuccessful.
Unrel Data Value   -- The value that indicates unreliable data.  This is used
                      to indicate an attempt was made to determine the
                      parameter value, but the value was deemed to be
                      unreliable by the analysis personnel.
Below Detect Limit -- The value that indicates parameter values below the
                      instruments detection limits.  This is used to
                      indicate that an attempt was made to determine the
                      parameter value, but the analysis personnel determined
                      that the parameter value was below the detection
                      limit of the instrumentation.
Data Not Cllctd    -- This value indicates that no attempt was made to
                      determine the parameter value.  This usually
                      indicates that BORIS combined several similar but
                      not identical data sets into the same data base table
                      but this particular science team did not
                      measure that parameter.

Blank -- Indicates that blank spaces are used to denote that type of value.
N/A   -- Indicates that the value is not applicable to the respective column.
None  -- Indicates that no values of that sort were found in the column.
--------------------------------------------------------------------------------

7.4 Sample Data Record

Reference File

SITE_NAME,SUB_SITE,DATE_OBS,TIME,C130_LINE_NUM,C130_RUN_NUM,PLATFORM_ALTITUDE,
C130_TRUE_HEADING,RELATIVE_SOLAR_POSITION,SOLAR_ZEN_ANG,SOLAR_AZ_ANG,
CENTER_VIEW_ZEN_ANG,CENTER_VIEW_AZ_ANG,RELATIVE_VIEW_AZ_ANG,
ASAS_EXTRACTION_START_LINE,ASAS_EXTRACTION_START_SAMPLE,
ASAS_EXTRACTION_END_LINE,ASAS_EXTRACTION_END_SAMPLE,COLUMN_WATER_VAPOR_6S,
OZONE_CONTENT_6S,INTERP_AEROSOL_OPT_THICK_550,EST_BELOW_PLATFORM_WATER_VAPOR,
EST_BELOW_PLATFORM_OZONE,EST_BELOW_PLATFORM_AOT_550,CRTFCN_CODE,REVISION_DATE
'NSA-FEN-FLXTR','RSS02-BRF01',07-JUN-1994,165635,201,1,5640.0,320.0,'parallel',
37.6,142.2,45.1,134.4,352.186,252,360,257,364,14.2,340.0,.055,12.16,10.0,.051,
'CPI',25-FEB-1999
'NSA-FEN-FLXTR','RSS02-BRF01',07-JUN-1994,165701,201,1,5640.0,320.0,'parallel',
37.5,142.4,26.3,130.1,347.725,268,371,272,375,14.2,340.0,.055,12.16,10.0,.051,
'CPI',25-FEB-1999

Data File

SITE_NAME,SUB_SITE,DATE_OBS,TIME,WAVELENGTH,ASAS_CHANNEL_NUM,
CENTER_VIEW_ZEN_ANG,MEAN_RADIANCE,SDEV_RADIANCE,MEAN_SURF_RAD,SDEV_SURF_RAD,
MEAN_SURF_REFL,SDEV_SURF_REFL,DIRECT_DOWN_SOLAR_IRRAD,DIFFUSE_DOWN_SOLAR_IRRAD,
ENV_DOWN_SOLAR_IRRAD,CRTFCN_CODE,REVISION_DATE
'NSA-FEN-FLXTR','RSS02-BRF01',07-JUN-1994,165635,.4043,1,45.1,7.789,4.048,
0.0,0.0,0.0,0.0,742.062,264.087,0.0,'CPI',15-JAN-1999
'NSA-FEN-FLXTR','RSS02-BRF01',07-JUN-1994,165635,.4137,2,45.1,12.366,3.153,
0.0,0.0,0.0,0.0,833.501,259.931,0.0,'CPI',15-JAN-1999
