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'