BOREAS Level-0 AOCI Imagery: Digital Counts in BIL Format

7.3 Data Characteristics

7.3.1 Parameter/Variable

The parameter contained in the image data files is:
Digital Number (DN)

The parameters contained in the inventory listing file on the CD-ROM are:
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                                                                  
BAND_QUALITY                                                                    
CLOUD_COVER                                                                     
AOCI_MEAN_FRAME_STATUS                                                          
NW_LATITUDE                                                                     
NW_LONGITUDE                                                                    
NE_LATITUDE                                                                     
NE_LONGITUDE                                                                    
SW_LATITUDE                                                                     
SW_LONGITUDE                                                                    
SE_LATITUDE                                                                     
SE_LONGITUDE                                                                    
CRTFCN_CODE                                                                     

7.3.2 Variable Description/Definition

For the image data files:
Digital Number (DN) - The quantized DN derived by the AOCI scanning system for 
                      the respective channel.

The descriptions of the parameters contained in the inventory listing file on 
the CD-ROM 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.       
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.                        
AOCI_MEAN_FRAME_STATUS         The mean frame status calculated from the
                               respective values on the digital tape of AOCI data 
                               collected during the given flight.                  
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
                               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 latitude 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 latitude 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

For the image data files:
Digital Number (DN) - counts

The measurement units for the parameters contained in the inventory listing file 
on the CD-ROM 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]                                           
BAND_QUALITY                   [none]                                           
CLOUD_COVER                    [none]                                           
AOCI_MEAN_FRAME_STATUS         [unitless]                                       
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 level-0 AOCI image bands were collected by the AOCI instrument on the ER2 
aircraft.  The raw data were decommutated, processed, and sent to BORIS by 
personnel within the High Altitude Aircraft Branch at NASA ARC.


The source of the parameter values contained in the inventory listing file on 
the CD-ROM are:

Column Name                    Data Source                    
------------------------------ ------------------------------------------------ 
SPATIAL_COVERAGE               [ER2 Flight Summary Reports and calculations 
                                within the BORIS software using information from 
                                the AOCI image data]                                
DATE_OBS                       [AOCI image housekeeping data]                                
START_TIME                     [AOCI image housekeeping data 
END_TIME                       [AOCI image housekeeping data]                                
PLATFORM                       [Constant software parameter value]                                
INSTRUMENT                     [Constant software parameter value]                                
NUM_BANDS                      [Constant software parameter value]                                
PLATFORM_ALTITUDE              [ER2 Flight Summary Reports]                                
MIN_SOLAR_ZEN_ANG              [Calculated from DATE_OBS, TIME_OBS, and 
                                latitude and longitude information]                                
MAX_SOLAR_ZEN_ANG              [Calculated from DATE_OBS, TIME_OBS, and 
                                latitude and longitude information]                                
MIN_SOLAR_AZ_ANG               [Calculated from DATE_OBS, TIME_OBS, and 
                                latitude and longitude information]                                
MAX_SOLAR_AZ_ANG               [Calculated from DATE_OBS, TIME_OBS, and 
                                latitude and longitude information]                                
ER2_MISSION_ID                 [ER2 Flight Summary Reports]                                
BAND_QUALITY                   [Constant software parameter value]                                
CLOUD_COVER                    [Constant software parameter value]                                
AOCI_MEAN_FRAME_STATUS         [Calculated with software from the AOCI image 
                                housekeeping data]                                
NW_LATITUDE                    [Calculated from the nadir latitude and longitude, 
                                heading, and altitude information in the Flight 
                                Summary Report, the constant instrument scan 
                                angle, and mean aircraft roll angle calculated 
                                from the image housekeeping data]                                
NW_LONGITUDE                   [Calculated from the nadir latitude and longitude, 
                                heading, and altitude information in the Flight 
                                Summary Report, the constant instrument scan 
                                angle, and mean aircraft roll angle calculated 
                                from the image housekeeping data]                                
NE_LATITUDE                    [Calculated from the nadir latitude and longitude, 
                                heading, and altitude information in the Flight 
                                Summary Report, the constant instrument scan 
                                angle, and mean aircraft roll angle calculated 
                                from the image housekeeping data]                                
NE_LONGITUDE                   [Calculated from the nadir latitude and longitude, 
                                heading, and altitude information in the Flight 
                                Summary Report, the constant instrument scan 
                                angle, and mean aircraft roll angle calculated 
                                from the image housekeeping data]                                
SW_LATITUDE                    [Calculated from the nadir latitude and longitude, 
                                heading, and altitude information in the Flight 
                                Summary Report, the constant instrument scan 
                                angle, and mean aircraft roll angle calculated 
                                from the image housekeeping data]                                
SW_LONGITUDE                   [Calculated from the nadir latitude and longitude, 
                                heading, and altitude information in the Flight 
                                Summary Report, the constant instrument scan 
                                angle, and mean aircraft roll angle calculated 
                                from the image housekeeping data]                                
SE_LATITUDE                    [Calculated from the nadir latitude and longitude, 
                                heading, and altitude information in the Flight 
                                Summary Report, the constant instrument scan 
                                angle, and mean aircraft roll angle calculated 
                                from the image housekeeping data]                                
SE_LONGITUDE                   [Calculated from the nadir latitude and longitude, 
                                heading, and altitude information in the Flight 
                                Summary Report, the constant instrument scan 
                                angle, and mean aircraft roll angle calculated 
                                from the image housekeeping data]                                
CRTFCN_CODE                    [Constant data base value]                                

7.3.5 Data Range

The maximum range of DNs in each level-0 AOCI image band is limited from 0 to 
1023 (10 bits) and is stored in a 16-bit (2-byte) field.

The following table gives information about the parameter values found in the 
inventory table on the CD-ROM.

                     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             21-JUL-1994    21-JUL-1994    None    None   None    None 
START_TIME           1628           1854           None    None   None    None 
END_TIME             1631           1903           None    None   None    None 
PLATFORM             ER2            ER2            None    None   None    None 
INSTRUMENT           N/A            N/A            None    None   None    None 
NUM_BANDS            10             10             None    None   None    None 
PLATFORM_ALTITUDE    19141          19903          None    None   None    None 
MIN_SOLAR_ZEN_ANG    68.4           69.9           None    None   None    None 
MAX_SOLAR_ZEN_ANG    68.7           70.7           None    None   None    None 
MIN_SOLAR_AZ_ANG     275.6          277.7          None    None   None    None 
MAX_SOLAR_AZ_ANG     276.2          278.9          None    None   None    None 
ER2_MISSION_ID       94-120         94-120         None    None   None    None 
BAND_QUALITY         N/A            N/A            None    None   None    None 
CLOUD_COVER          N/A            N/A            None    None   None    None 
AOCI_MEAN_FRAME_     0              0              None    None   None    None 
STATUS              
NW_LATITUDE          53.333         54.46046       None    None   None    None 
NW_LONGITUDE         -106.687       -104.83885     None    None   None    None 
NE_LATITUDE          53.30691       54.43288       None    None   None    None 
NE_LONGITUDE         -105.91003     -104.17147     None    None   None    None 
SW_LATITUDE          53.00647       53.81953       None    None   None    None 
SW_LONGITUDE         -106.73624     -104.92877     None    None   None    None 
SE_LATITUDE          52.98057       53.78488       None    None   None    None 
SE_LONGITUDE         -106.01627     -104.23941     None    None   None    None 
CRTFCN_CODE          PRE            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

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,BAND_QUALITY,CLOUD_COVER,
AOCI_MEAN_FRAME_STATUS,NW_LATITUDE,NW_LONGITUDE,NE_LATITUDE,NE_LONGITUDE,
SW_LATITUDE,SW_LONGITUDE,SE_LATITUDE,SE_LONGITUDE,CRTFCN_CODE
'SSA',21-JUL-1994,1628,1631,'ER2','AOCI',10,19202.0,68.4,68.7,275.6,276.2,
'94-120','NOT ASSESSED','NOT ASSESSED',0,53.333,-105.95442,53.30691,
-105.38564,53.00647,-105.99376,52.98057,-105.42938,'PRE'
'SSA',21-JUL-1994,1637,1638,'ER2','AOCI',10,19263.0,69.1,69.4,276.6,277.1,
'94-120','NOT ASSESSED','NOT ASSESSED',0,54.01666,-105.60672,53.98428,
-104.93893,53.64976,-105.65474,53.61767,-104.99284,'PRE'
