BOREAS RSS-18 Level-1b AVIRIS Images

7.3 Data Characteristics

7.3.1 Parameter/Variable

The parameters contained in the data files are:

         Column Name
------------------------------
SPATIAL_COVERAGE
DATE_OBS
START_TIME
END_TIME
PLATFORM
INSTRUMENT
NUM_BANDS
PLATFORM_ALTITUDE
MIN_SOLAR_ZEN_ANG
MAX_SOLAR_ZEN_ANG
MIN_SOLAR_AZ_ANG
MAX_SOLAR_AZ_ANG
ER2_MISSION_ID
AVIRIS_FLIGHT_ID
AVIRIS_RUN_NUM
AVIRIS_SCENE_NUM
BAND_QUALITY
CLOUD_COVER
NUM_GOOD_LINES
NUM_SYNC_LINES
NUM_MISSING_LINES
NUM_INV_CNT_LINES
NUM_INV_FRAME_LINES
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 data 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.
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.
ER2_MISSION_ID                 The mission identifier assigned to the ER2 
                               mission in the form of YY-DDD where YY is the 
                               last two digits of the fiscal year, and DDD is 
                               the deployment number. An example would be 
                               94-120.
AVIRIS_FLIGHT_ID               Flight ID as assigned in the header files.
AVIRIS_RUN_NUM                 Each flight contains about 5-15 Runs. Each Run
                               is an image which is later sliced up into Scenes.
AVIRIS_SCENE_NUM               Each AVIRIS run`s image is sliced up into small
                               manageable Scenes as each image has 224 bands.
BAND_QUALITY                   The data analyst's assessment of the quality of
                               the spectral bands in the data.
CLOUD_COVER                    The data analyst's assessment of the cloud cover
                               that exists in the data.
NUM_GOOD_LINES                 Each image line has a flag indicating the status
                               of the line.  This number indicates the number
                               of lines that were flagged as good data.
NUM_SYNC_LINES                 Each image line has a flag indicating the status
                               of the line.  This number indicates the number
                               of lines that were dropped due to a bad sync 
                               pattern.
NUM_MISSING_LINES              Each image line has a flag indicating the status
                               of the line.  This number indicates the number
                               of actual lines of science data missing when the
                               data were archived.
NUM_INV_CNT_LINES              Each image line has a flag indicating the status
                               of the line.  This number indicates the number
                               of lines that were dropped because of an invalid
                               count flag.
NUM_INV_FRAME_LINES            Each image line has a flag indicating the status
                               of the line.  This number indicates the number
                               of lines that were dropped because of an invalid
                               frame somewhere in the line.
NW_LATITUDE                    The NAD83 based latitude coordinate of the north
                               west 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 north-
                               east corner of the minimum bounding rectangle for
                               the data.
NE_LONGITUDE                   The NAD83 based longitude coordinate of the north
                               east corner of the minimum bounding rectangle for 
                               the data.
SW_LATITUDE                    The NAD83 based latitude coordinate of the south
                               west corner of the minimum bounding rectangle for
                               the data.
SW_LONGITUDE                   The NAD83 based longitude coordinate of the south
                               west corner of the minimum bounding rectangle for
                               the data.
SE_LATITUDE                    The NAD83 based latitude coordinate of the south
                               east corner of the minimum bounding rectangle for
                               the data.
SE_LONGITUDE                   The NAD83 based longitude coordinate of the south
                               east 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 data 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]
MIN_SOLAR_ZEN_ANG              [degrees]
MAX_SOLAR_ZEN_ANG              [degrees]
MIN_SOLAR_AZ_ANG               [degrees]
MAX_SOLAR_AZ_ANG               [degrees]
ER2_MISSION_ID                 [none]
AVIRIS_FLIGHT_ID               [none]
AVIRIS_RUN_NUM                 [none]
AVIRIS_SCENE_NUM               [none]
BAND_QUALITY                   [none]
CLOUD_COVER                    [none]
NUM_GOOD_LINES                 [counts]
NUM_SYNC_LINES                 [counts]
NUM_MISSING_LINES              [counts]
NUM_INV_CNT_LINES              [none]
NUM_INV_FRAME_LINES            [none]
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 source of the parameter values contained in the data files are:

         Column Name                             Data Source
------------------------- ------------------------------------------------------
SPATIAL_COVERAGE          [Determined by BORIS software from header information]
DATE_OBS                  [Determined by BORIS software from header information]
START_TIME                [Determined by BORIS software from header information]
END_TIME                  [Determined by BORIS software from header information]
PLATFORM                  [Determined by BORIS software from header information]
INSTRUMENT                [Constant software value]
NUM_BANDS                 [Determined by BORIS software from header information]
PLATFORM_ALTITUDE         [Determined by BORIS software from header information]
MIN_SOLAR_ZEN_ANG         [Calculated from latitude and longitude and time 
                           information given in the header]
MAX_SOLAR_ZEN_ANG         [Calculated from latitude and longitude and time 
                           information given in the header]
MIN_SOLAR_AZ_ANG          [Calculated from latitude and longitude and time 
                           information given in the header]
MAX_SOLAR_AZ_ANG          [Calculated from latitude and longitude and time 
                           information given in the header]
ER2_MISSION_ID            [Determined by BORIS software from header information]
AVIRIS_FLIGHT_ID          [Determined by BORIS software from header information]
AVIRIS_RUN_NUM            [Determined by BORIS software from header information]
AVIRIS_SCENE_NUM          [Determined by BORIS software from header information]
BAND_QUALITY              [Not Assessed]
CLOUD_COVER               [Not Assessed]
NUM_GOOD_LINES            [Determined by BORIS software from header information]
NUM_SYNC_LINES            [Determined by BORIS software from header information]
NUM_MISSING_LINES         [Determined by BORIS software from header information]
NUM_INV_CNT_LINES         [Determined by BORIS software from header information]
NUM_INV_FRAME_LINES       [Determined by BORIS software from header information]
NW_LATITUDE               [Determined by BORIS software from header information]
NW_LONGITUDE              [Determined by BORIS software from header information]
NE_LATITUDE               [Determined by BORIS software from header information]
NE_LONGITUDE              [Determined by BORIS software from header information]
SW_LATITUDE               [Determined by BORIS software from header information]
SW_LONGITUDE              [Determined by BORIS software from header information]
SE_LATITUDE               [Determined by BORIS software from header information]
SE_LONGITUDE              [Determined by BORIS software from header information]
PLATFORM_ALTITUDE         [Determined by BORIS software from header information]
CRTFCN_CODE               [Assigned by BORIS]

7.3.5 Data Range

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

   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    14-AUG-1996    None    None   None    None
START_TIME           1525           2043           None    None   None    None
END_TIME             1525           2044           None    None   None    None
PLATFORM             ER2            ER2            None    None   None    None
INSTRUMENT           N/A            N/A            None    None   None    None
NUM_BANDS            224            224            None    None   None    None
PLATFORM_ALTITUDE    2282.2         20266.1        None    None   None    None
MIN_SOLAR_ZEN_ANG    17.7           61.8           None    None   None    None
MAX_SOLAR_ZEN_ANG    30.8           62             None    None   None    None
MIN_SOLAR_AZ_ANG     109.9          206.7          None    None   None    None
MAX_SOLAR_AZ_ANG     116.4          206.9          None    None   None    None
ER2_MISSION_ID       94-079         96-161         None    None   None    None
AVIRIS_FLIGHT_ID     940419B        960814B        None    None   None    None
AVIRIS_RUN_NUM       01             13             None    None   None    None
AVIRIS_SCENE_NUM     01             20             None    None   None    None
BAND_QUALITY         N/A            N/A            None    None   None    None
CLOUD_COVER          N/A            N/A            None    None   None    None
NUM_GOOD_LINES       179            512            None    None   None    None
NUM_SYNC_LINES       0              0              None    None   None    None
NUM_MISSING_LINES    0              0              None    None   None    None
NUM_INV_CNT_LINES    0              45             None    None   None    None
NUM_INV_FRAME_LINES  0              333            None    None   None    None
NW_LATITUDE          53.19646       56.06067       None    None   None    None
NW_LONGITUDE         -106.37844     -97.93204      None    None   None    None
NE_LATITUDE          53.18896       56.04405       None    None   None    None
NE_LONGITUDE         -106.21561     -97.78588      None    None   None    None
SW_LATITUDE          39.43284       56.00427       None    None   None    None
SW_LONGITUDE         -107.52661     -97.96779      None    None   None    None
SE_LATITUDE          39.32808       55.98757       None    None   None    None
SE_LONGITUDE         -106.21941     -97.82201      None    None   None    None
CRTFCN_CODE          CPI            CPI            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

SPATIAL_COVERAGE,DATE_OBS,START_TIME,END_TIME,PLATFORM,INSTRUMENT,NUM_BANDS,
PLATFORM_ALTITUDE,MIN_SOLAR_ZEN_ANG,MAX_SOLAR_ZEN_ANG,MIN_SOLAR_AZ_ANG,
MAX_SOLAR_AZ_ANG,ER2_MISSION_ID,AVIRIS_FLIGHT_ID,AVIRIS_RUN_NUM,
AVIRIS_SCENE_NUM,BAND_QUALITY,CLOUD_COVER,NUM_GOOD_LINES,NUM_SYNC_LINES,
NUM_MISSING_LINES,NUM_INV_CNT_LINES,NUM_INV_FRAME_LINES,NW_LATITUDE,
NW_LONGITUDE,NE_LATITUDE,NE_LONGITUDE,SW_LATITUDE,SW_LONGITUDE,SE_LATITUDE,
SE_LONGITUDE,CRTFCN_CODE
'SSA',19-APR-1994,1801,1802,'ER2','AVIRIS',224,19477.1,47.3,47.4,158.6,
158.8,'94-079','940419B','02','01','NOT ASSESSED','NOT ASSESSED',349,0,0,0,
163,53.22423,-105.76718,53.21731,-105.61618,53.10208,-105.78247,53.09519,
-105.63192,'CPI'
'SSA',19-APR-1994,1802,1803,'ER2','AVIRIS',224,19476.4,47.3,47.5,158.8,
159.1,'94-079','940419B','02','02','NOT ASSESSED','NOT ASSESSED',366,0,0,0,
146,53.28185,-105.77747,53.27426,-105.61159,53.20457,-105.78715,53.197,
-105.62158,'CPI'
