BOREAS RSS-02 Level-1B ASAS Image Data: At-sensor Radiance in BSQ Format

7.3 Data Characteristics

Due to differences in the information that is available for ASAS data collected 
in 1994 and 1996, the inventory tables contain different sets of parameters.
 
7.3.1 Parameter/Variable

Image files:

The parameters contained in the inventory files are:

         Column Name
------------------------------
SPATIAL_COVERAGE
DATE_OBS
START_TIME
END_TIME
PLATFORM
INSTRUMENT
NUM_BANDS
PLATFORM_ALTITUDE
ASAS_VIEW_ANG
ASAS_SCAN_RATE
MIN_SOLAR_ZEN_ANG
MAX_SOLAR_ZEN_ANG
MIN_SOLAR_AZ_ANG
MAX_SOLAR_AZ_ANG
C130_MISSION_ID  (missing from the 1996 data)
C130_LINE_NUM    (missing from the 1996 data)
C130_RUN_NUM     (missing from the 1996 data)
C130_SITE        (missing from the 1996 data)
NW_LATITUDE
NW_LONGITUDE
NE_LATITUDE
NE_LONGITUDE
SW_LATITUDE
SW_LONGITUDE
SE_LATITUDE
SE_LONGITUDE
CRTFCN_CODE


7.3.2 Variable Description/Definition

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

         Column Name                             Description
------------------------------ ------------------------------------------------
SPATIAL_COVERAGE               The general term used to denote the spatial area
                               over which the data were collected.
DATE_OBS                       The date on which the data were collected.
START_TIME                     The starting Greenwich Mean Time (GMT) for the 
                               data collected.
END_TIME                       The ending Greenwich Mean Time (GMT) for the data
                               collected.
PLATFORM                       The object (e.g., satellite, aircraft, tower, 
                               person) that supported the instrument.
INSTRUMENT                     The name of the device used to make the 
                               measurements.
NUM_BANDS                      The number of spectral bands in the data. 
PLATFORM_ALTITUDE              The nominal altitude of the data collection  
                               platform above the target.    
ASAS_VIEW_ANG                  The list of view angles (in degrees) acquired by
                               the ASAS instrument on this site pass.
ASAS_SCAN_RATE                 The ASAS sensor scans in a push-broom fashion one
                               row (frame) at a time.  In the image header this
                               is referred to as the frame rate and is the 
                               number of rows of image data captured per second.
MIN_SOLAR_ZEN_ANG              The minimum angle from the surface normal 
                               (straight up) to the sun during the data 
                               collection.
MAX_SOLAR_ZEN_ANG              The maximum angle from the surface normal 
                               (straight up) to the sun during the data 
                               collection.
MIN_SOLAR_AZ_ANG               The minimum azimuthal direction of the sun 
                               during data collection expressed in clockwise 
                               increments from North.
MAX_SOLAR_AZ_ANG               The maximum azimuthal direction of the sun 
                               during data collection expressed in clockwise 
                               increments from North.
C130_MISSION_ID                The mission identifier assigned to the C130 
                               mission in the form of YY-DDD-FF where YY is the 
                               last two digits of the fiscal year, DDD is the 
                               deployment number for "official" C130 missions 
                               and is day of year for non-"official" C130 
                               missions (i.e., no site coverage), and FF is the 
                               flight number within the given deployment (00 is 
                               given for non-"official" C130 missions).  An 
                               example would be 94-006-04.

Note that the C130_MISSION_ID, C130_LINE_NUM, C130_RUN_NUM, and C130_SITE 
columns are missing from the 1996 data.  The mission information in 1994 was 
provided by personnel in the NASA Earth Resources Aircraft Program at NASA/ARC.  
In 1996, the C130 aircraft was provided by the NASA/WFF, which did not create 
this mission information.  The reference to "non-official" C130 missions above 
applies  primarily to sun photometer data from the C130 platform in 1994 (RSS-
12) where data was collected on the tarmac and possibly within flight, but the 
"official" C130 mission was aborted before or slightly after takeoff.

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.
C130_SITE                      The C130 site designator as given in the flight
                               logs. PRE is used for data taken from the airport
                               to the first "official" C130 site, BTW is used
                               for data taken between two "official" C130 sites,
                               DSC is used for data taken after the last 
                               "official" C130 site, TRN is used for transect 
                               data, and YTH and YPA are used for data taken at 
                               the YTH and YPA airports (aircraft never left the 
                               ground).
NW_LATITUDE                    The NAD83 based latitude coordinate of the 
                               northwest corner of the minimum bounding 
                               rectangle for the data.   
NW_LONGITUDE                   The NAD83 based longitude coordinate of the 
                               northwest corner of the minimum bounding 
                               rectangle for the data.
NE_LATITUDE                    The NAD83 based latitude coordinate of the 
                               northeast corner of the minimum bounding 
                               rectangle for the data.                  
NE_LONGITUDE                   The NAD83 based longitude coordinate of the 
                               northeast corner of the minimum bounding 
                               rectangle for the data.   
SW_LATITUDE                    The NAD83 based longitude coordinate of the 
                               southwest corner of the minimum bounding 
                               rectangle for the data.  
SW_LONGITUDE                   The NAD83 based longitude coordinate of the 
                               southwest corner of the minimum bounding 
                               rectangle for the data.  
SE_LATITUDE                    The NAD83 based longitude coordinate of the 
                               southeast corner of the minimum bounding 
                               rectangle for the data.                 
SE_LONGITUDE                   The NAD83 based longitude coordinate of the 
                               southeast corner of the minimum bounding 
                               rectangle for the data.  
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).        

7.3.3 Unit of Measurement

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

         Column Name                                Units
------------------------------ ------------------------------------------------
SPATIAL_COVERAGE               [none]
DATE_OBS                       [DD-MON-YYYY]
START_TIME                     [HHMM GMT]
END_TIME                       [HHMM GMT]
PLATFORM                       [none]
INSTRUMENT                     [none]
NUM_BANDS                      [counts]
PLATFORM_ALTITUDE              [meters]
ASAS_VIEW_ANG                  [none]
ASAS_SCAN_RATE                 [unitless]
MIN_SOLAR_ZEN_ANG              [degrees]
MAX_SOLAR_ZEN_ANG              [degrees]
MIN_SOLAR_AZ_ANG               [degrees]
MAX_SOLAR_AZ_ANG               [degrees]
C130_MISSION_ID                [none]     (Missing from the 1996 data)
C130_LINE_NUM                  [none]     (Missing from the 1996 data)
C130_RUN_NUM                   [none]     (Missing from the 1996 data)
C130_SITE                      [none]     (Missing from the 1996 data)
NW_LATITUDE                    [degrees]
NW_LONGITUDE                   [degrees]
NE_LATITUDE                    [degrees]
NE_LONGITUDE                   [degrees]
SW_LATITUDE                    [degrees]
SW_LONGITUDE                   [degrees]
SE_LATITUDE                    [degrees]
SE_LONGITUDE                   [degrees]
CRTFCN_CODE                    [none]


7.3.4 Data Source

The sources of the parameter values contained in the inventory files are:

         Column Name                             Data Source
------------------------------ ------------------------------------------------
SPATIAL_COVERAGE               [Assigned by BORIS]
DATE_OBS                       [ASAS image header]
START_TIME                     [ASAS image header]
END_TIME                       [ASAS image header]
PLATFORM                       [ASAS image header]
INSTRUMENT                     [Assigned by BORIS]
NUM_BANDS                      [ASAS image header]
PLATFORM_ALTITUDE              [ASAS image header]
ASAS_VIEW_ANG                  [ASAS image header]
ASAS_SCAN_RATE                 [ASAS image header]
MIN_SOLAR_ZEN_ANG              [ASAS image header]
MAX_SOLAR_ZEN_ANG              [ASAS image header]
MIN_SOLAR_AZ_ANG               [ASAS image header]
MAX_SOLAR_AZ_ANG               [ASAS image header]
C130_MISSION_ID                [ASAS image header] (Missing from the 1996 data)
C130_LINE_NUM                  [ASAS image header] (Missing from the 1996 data)
C130_RUN_NUM                   [ASAS image header] (Missing from the 1996 data)
C130_SITE                      [ASAS image header] (Missing from the 1996 data)
NW_LATITUDE                    [Computed by BORIS]
NW_LONGITUDE                   [Computed by BORIS]
NE_LATITUDE                    [Computed by BORIS]
NE_LONGITUDE                   [Computed by BORIS]
SW_LATITUDE                    [Computed by BORIS]
SW_LONGITUDE                   [Computed by BORIS]
SE_LATITUDE                    [Computed by BORIS]
SE_LONGITUDE                   [Computed by BORIS]
CRTFCN_CODE                    [Assigned by BORIS]


7.3.5  Data Range

The range of parameter values contained in the inventory file for the 1994 data 
are:
                     Minimum        Maximum        Missng  Unrel  Below   Data
                     Data           Data           Data    Data   Detect  Not
Column Name          Value          Value          Value   Value  Limit   Cllctd
--------------------------------------------------------------------------------
SPATIAL_COVERAGE     N/A            N/A            None    None   None    None
DATE_OBS             19-APR-1994    17-SEP-1994    None    None   None    None
START_TIME           1527           2112           None    None   None    None
END_TIME             1529           2115           None    None   None    None
PLATFORM             C130           C130           None    None   None    None
INSTRUMENT           N/A            N/A            None    None   None    None
NUM_BANDS            62             62             None    None   None    None
PLATFORM_ALTITUDE    4633           5791.2         None    None   None    None
ASAS_VIEW_ANG        N/A            N/A            None    None   None    None
ASAS_SCAN_RATE       38             38             None    None   None    None
MIN_SOLAR_ZEN_ANG    33.5           61.1           None    None   None    None
MAX_SOLAR_ZEN_ANG    33.5           61.4           None    None   None    None
MIN_SOLAR_AZ_ANG     108.4          228.6          None    None   None    None
MAX_SOLAR_AZ_ANG     109.1          229.6          None    None   None    None
C130_MISSION_ID      94-004-10      94-009-09      None    None   None    None
C130_LINE_NUM        101            703            None    None   None    None
C130_RUN_NUM         1              3              None    None   None    None
C130_SITE            429            431            None    None   None    None
NW_LATITUDE          53.24665       55.94083       None    None   None    None
NW_LONGITUDE         -106.21453     -98.29598      None    None   None    None
NE_LATITUDE          53.24525       55.93712       None    None   None    None
NE_LONGITUDE         -106.18277     -98.25648      None    None   None    None
SW_LATITUDE          53.22982       55.92403       None    None   None    None
SW_LONGITUDE         -106.21694     -98.3016       None    None   None    None
SE_LATITUDE          53.22822       55.92094       None    None   None    None
SE_LONGITUDE         -106.18487     -98.26697      None    None   None    None
CRTFCN_CODE          CPI-PRE        CPI-PRE        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.
--------------------------------------------------------------------------------


The range of parameter values contained in the inventory file for the 1996 data 
are:

                     Minimum        Maximum        Missng  Unrel  Below   Data
                     Data           Data           Data    Data   Detect  Not
Column Name          Value          Value          Value   Value  Limit   Cllctd
--------------------------------------------------------------------------------
SPATIAL_COVERAGE     N/A            N/A            None    None   None    None
DATE_OBS             04-MAR-1996    30-JUL-1996    None    None   None    None
START_TIME           1615           2122           None    None   None    None
END_TIME             1618           2124           None    None   None    None
PLATFORM             C130           C130           None    None   None    None
INSTRUMENT           N/A            N/A            None    None   None    None
NUM_BANDS            62             62             None    None   None    None
PLATFORM_ALTITUDE    4328.2         5174           None    None   None    None
ASAS_VIEW_ANG        N/A            N/A            None    None   None    None
ASAS_SCAN_RATE       38             38             None    None   None    None
MIN_SOLAR_ZEN_ANG    33.1           63.2           None    None   None    None
MAX_SOLAR_ZEN_ANG    33.2           63.4           None    None   None    None
MIN_SOLAR_AZ_ANG     120.8          217.9          None    None   None    None
MAX_SOLAR_AZ_ANG     121.5          218.5          None    None   None    None
NW_LATITUDE          53.58222       55.944494      None    None   None    None
NW_LONGITUDE         -106.21943     -98.30170      None    None   None    None
NE_LATITUDE          53.58061       55.93927       None    None   None    None
NE_LONGITUDE         -106.17876     -98.25476      None    None   None    None
SW_LATITUDE          53.56258       55.92007       None    None   None    None
SW_LONGITUDE         -106.22169     -98.31196      None    None   None    None
SE_LATITUDE          53.56066       55.91449       None    None   None    None
SE_LONGITUDE         -106.18170     -98.26317      None    None   None    None
CRTFCN_CODE          CPI-PRE        CPI-PRE        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

Sample data record from the 1994 inventory file:

SPATIAL_COVERAGE,DATE_OBS,START_TIME,END_TIME,PLATFORM,INSTRUMENT,NUM_BANDS,
PLATFORM_ALTITUDE,ASAS_VIEW_ANG,ASAS_SCAN_RATE,MIN_SOLAR_ZEN_ANG,
MAX_SOLAR_ZEN_ANG,MIN_SOLAR_AZ_ANG,MAX_SOLAR_AZ_ANG,C130_MISSION_ID,
C130_LINE_NUM,C130_RUN_NUM,C130_SITE,NW_LATITUDE,NW_LONGITUDE,NE_LATITUDE,
NE_LONGITUDE,SW_LATITUDE,SW_LONGITUDE,SE_LATITUDE,SE_LONGITUDE,CRTFCN_CODE
'SSA-OBS',19-APR-1994,1713,1715,'C130','ASAS',62,4633.0,
'60 45 26 15 0 -15 -26 -45-55',38,47.6,47.8,143.5,144.3,'94-004-10',101,1,
'429',53.99938,-105.13468,53.99769,-105.10065,53.97925,-105.13757,53.97755,
-105.10356,'CPI-PRE'
'SSA-OBS',19-APR-1994,1724,1727,'C130','ASAS',62,4633.0,
'60 45 26 15 0 -15 -26 -45-55',38,46.6,46.8,147.3,148.1,'94-004-10',103,1,
'429',53.99613,-105.13056,53.99489,-105.10564,53.98204,-105.13259,53.9808,
-105.10768,'CPI-PRE'


Sample data record from the 1996 inventory file:

SPATIAL_COVERAGE,DATE_OBS,START_TIME,END_TIME,PLATFORM,INSTRUMENT,NUM_BANDS,PLAT
FORM_ALTITUDE,ASAS_VIEW_ANG,ASAS_SCAN_RATE,MIN_SOLAR_ZEN_ANG,MAX_SOLAR_ZEN_ANG,M
IN_SOLAR_AZ_ANG,MAX_SOLAR_AZ_ANG,NW_LATITUDE,NW_LONGITUDE,NE_LATITUDE,NE_LONGITU
DE,SW_LATITUDE,SW_LONGITUDE,SE_LATITUDE,SE_LONGITUDE,CRTFCN_CODE
'SSA-9OA',04-MAR-1996,1754,1757,'C130','ASAS',62,4419.6,'60 45 26 0 -26 -45 -55'
,38,62.0,62.2,156.8,157.5,53.64802,-106.21728,53.64626,-106.17425,53.61376,-106.
22125,53.612,-106.17826,'CPI-PRE'
'SSA-9OA',04-MAR-1996,1832,1835,'C130','ASAS',62,4480.6,'60 45 26 0 -26 -45',38,
60.3,60.4,167.4,168.1,53.64069,-106.21943,53.63882,-106.17382,53.6212,-106.22169
,53.61933,-106.1761,'CPI-PRE'

