L1AVNE (Visible and Near Infrared), L1ATIE (Thermal Infrared)

Transcription

1 2.0 LEVEL 1A DATA 2.1 Introduction OCTS Level 1A products are classified into three products following with data acquisition and processing method; GAC(Global Area Coverage), LAC (Local Area Coverage), and RTC (Real Time Coverage). Each Level 1A product is divided into two subproducts. One stores visible and near infrared observation data (OCTS band 1 to 8) and the other stores thermal infrared data (OCTS band 9 to 12). Each GAC product contains one scene data that observed with the same tilt angle continuously within sun shining period: tilt segment. GAC data are subsampled from full-resolution data with about every sixth pixel of a scan line and every fifth line recorded. LAC data consists of whole tilt segment data or about half size of tilt segment data, but not subsampled. RTC data have a coverage at EOC, but if tilt angle is changed, the data is divided into two scenes (products). Note that the data types in throughout this document are expressed with followings: Ch: character line Short: 2 byte integer (signed) Ushort: 2 byte integer (unsigned) Long: 4 byte integer (signed) Ulong: 4 byte integer (unsigned) Real: 4 byte real number Double: 8 byte real number Byte: 1 byte integer Binary data is Big Endian, IEEE format. Signed data is described in twos complement. 2.2 Naming Convention GAC LAC RTC Solar calibration Lamp calibration Electronic calibration L1AVNG (Visible and Near Infrared), L1ATIG (Thermal Infrared) L1AVNL (Visible and Near Infrared), L1ATIL (Thermal Infrared) L1AVNR (Visible and Near Infrared), L1ATIR (Thermal Infrared) L1AVNS (Visible and Near Infrared) L1AVNO (Visible and Near Infrared) L1AVNE (Visible and Near Infrared), L1ATIE (Thermal Infrared)

2 Global Attributes x bands Scan-Line Attributes Raw ADEOS Data svpxl octs_tlm raw radiance counts evpxl l1a_data (0-1023) msec blk_data lines miss_qual pixels eng_qual Converted Telemetry s_satp sc_time pre off_time Calibration pxl opr_mode t_gain t_offset det DSP_sys beta_d beta_p lat tilt_flag beta_am beta_ad lon tilt beta_oam beta_oad gain ref_temp eta Navigation SDE_sys linearity_v linearity_r orb_vec inst_temp temp rad orb_vel bb_temp opt_vec opt_a sun_ref AMUX_v mirror_e scan_axis_e att_ang const_i scan_m_a scan_ang sc_att rad_tbl_size Sensor Tilt rad_tbl rad_coef tilt_seg Orbit Data num_rec Subsampling Table Spacecraft Time Error precision num_tables num_inf utc_tai start_line obit_count ut1r_tai samp_table start_time polar_motion end_time start_date period_count interval ref_count num_points ref_time sc_pos sc_vel Figure 2 Structure of level 1A product

3 2.3 Global Attributes V group (refer 2.2) CDF0.0 V group class Mission and Documentation V data Number Type Size Data (Tag = VH) of data Product Name 1 Ch 7 (refer 2.2) The of the product file (without path) Title 1 Ch 23 "OCTS Level-1A GAC Data" GAC or "OCTS Level-1A LAC Data" LAC or "OCTS Level-1A RTC Data" RTC Data Center 1 Ch 31 "NASDA/Earth Observation Center" OCTS Data Processing Center (National Space Development Agency of Japan) Station Name 1 Ch 31 "NASDA/Earth Observation Center" : RTC OCTS Data Acquisition Center (only for RTC) Station Latitude 1 Real 4 Lat. of Data Acq. Center (only for RTC) Station Longitude 1 Real 4 Long. of Data Acq. Center (only for RTC) Mission 1 Ch 11 "ADEOS OCTS" Mission (satellite and sensor )

4 V data (Tag = VH) Number of data Type Size Data Mission Characteristics 1 Ch 189 "Nominal orbit: inclination = (Sun- Synchronous); node = 10:15-10:45 AM (descending); eccentricity =< ; altitude = 797km; ground speed = 6.6km/sec; revolutions per day = 14+11/41" Sensor 1 Ch 43 "Ocean Color and Temperature Scanner (OCTS)" Sensor Characteristics 1 Ch 123 "Number of bands = 12; number of detectors per band = 10; bits per pixel = 10; scan period = 0.905sec; bit rate = 3Mbit/sec" Data Type 1 Ch 4 "GAC" GAC "LAC" "RTC" "SOL" "LAM" "ELE" Data Sub-type 1 Ch 26 "Visible and Near-infrared" 17 "Thermal-infrared" LAC RTC Solar calibration Lamp calibration Electronic calibration Replacement Flag 1 Ch 9 "ORIGINAL" If this is the first version of this product delivered to the NASDA/EOC.

5 V data (Tag = VH) Number of data Type Size Data Software ID 1 Ch 4 "X Y" Identities version of the operational software used to create this product. X : OCTS software version Y : OCTS database version Processing Time 1 Ch 22 YYYYMMDD hh:mm:ss.ttt Local time of generation of this product. Processing Control 1 Ch 928 (refer attachment A) All input and processing control parameters used by the calling program to generate the product. Processing Log 1 Ch 728 (refer attachment C) Processing status information.

6 2.3.2 Data Time V data (Tag = VH) Number of data Type Size Data Start Time 1 Ch 22 YYYYMMDD hh:mm:ss.ttt Center time of the first scan line of the scene. (UT) End Time 1 Ch 22 YYYYMMDD hh:mm:ss.ttt Center time of the last scan line of the scene. (UT) Scene Center Time 1 Ch 22 YYYYMMDD hh:mm:ss.ttt Center time of the center scan line of the scene. (UT) Node Crossing Time 1 Ch 22 YYYYMMDD hh:mm:ss.ttt Descending node crossing time. (UT) Start Year 1 Short 2 Year of first scan line of the scene. Start Day 1 Short 2 Day-of-year first scan line of the scene. Start Millisec 1 Long 4 Milliseconds-of-day of start of the first scan line of the scene. End Year 1 Short 2 Year of last scan line of the scene. End Day 1 Short 2 Day-of-year last scan line of the scene. End Millisec 1 Long 4 Milliseconds-of-day of start of the last scan line of the scene. Orbit Number 1 Long 4

7 2.3.3 Data Quality [v] : Visible and Near-infrared, [t] : Thermal-infrared V data Number Type Size Data (Tag = VH) of data Pixels per Scan Line 1 Long 4 Number of pixels per scan line. variable (= p) GAC 2222 LAC(including ELE), RTC 180 SOL 80 LAM Number of Scan Lines 1 Long 4 Number of scan lines in the scene. Lines per Scan 1 Long 4 Number of lines per scan. 2 GAC 10 LAC, RTC Missing Frames 1 Long 4 Missing frame (scan) count.

8 2.3.4 File Metrics [v] : Visible and Near-infrared, [t] : Thermal-infrared V data Number Type Size Data (Tag = VH) of data Saturated Pixels 8 : [v] Long 32 : [v] Number of saturated pixels in valid range for 4 : [t] 16 : [t] each band. (array for number of bands) Non-Saturated Pixels 8 : [v] Long 32 : [v] Number of not saturated pixels in valid range 4 : [t] 16 : [t] for each band. (array for number of bands)

9 2.3.5 Scene Coordinates (only for observation mode; OBS) V data Number Type Size Data (Tag = VH) of data Latitude Units 1 Ch 14 "degrees North" Units used for all lat. values in this product. Longitude Units 1 Ch 13 "degrees East" Units used for all long. values in this product. Scene Center Latitude 1 Real 4 Latitude of the center point of the scene's center scan. Scene Center Longitude 1 Real 4 Longitude of the center point of the scene's center scan. Upper Left Latitude 1 Real 4 Latitude of the upper left scene corner. Upper Left Longitude 1 Real 4 Longitude of the upper left scene corner. Upper Right Latitude 1 Real 4 Latitude of the upper right scene corner. Upper Right Longitude 1 Real 4 Longitude of the upper right scene corner. Lower Left Latitude 1 Real 4 Latitude of the lower left scene corner. Lower Left Longitude 1 Real 4 Longitude of the lower left scene corner. Lower Right Latitude 1 Real 4 Latitude of the lower right scene corner. Lower Right Longitude 1 Real 4 Longitude of the lower right scene corner. Orbit Node Longitude 1 Real 4 Longitude of orbit descending node. RSP path 1 Short 2 RSP path number of the scene's start. Start argument of Latitude 1 Real 4 Argument of latitude of the scene's start. End argument of Latitude 1 Real 4 Argument of latitude of the scene's end.

10 2.4 V Groups Of the following eight V groups, four V groups, Scan-Line Attributes, Raw ADEOS Data, Converted Telemetry, and Navigation, contain data that are functions of scan lines. That is, each data object within these V groups have data for each scan line and is therefore dimensioned by the value of the global attribute, Number of Scan Lines. Thus, to get all the data corresponding to a specific scan line, n, the n th values of all data objects in these four V groups would need to be read.

11 2.4.1 Scan-Line Attributes V group Scan-Line Attributes V group class Scan_Line_Data [v] : Visible and Near-infrared, [t] : Thermal-infrared, [G] : GAC, [L] : LAC/RTC s : Number of scans ("Number of Scan Lines" of Data Quality in Global attributes ) n : Number of address calculating latitude and longitude ( dimension of which V group is "pxl" ) V group VH : long_ VH : valid_range / Type Size svpxl 8 : [v] 4 : [t] "bands" "Start valid pixel" Short 16 : [v] 8 : [t] Start pixel number of valid pixel range (valid pixel range: pixels for valid scan range of 1400km) evpxl 8 : [v] 4 : [t] "bands" "End valid pixel" Short 16 : [v] 8 : [t] End pixel number of valid pixel range msec s "rec" "Scan-line time, valid_range = Long 4 s Milliseconds of day. milliseconds of day" (0, ) miss_qual s "rec" "Missing frame flag" Ushort 2 s Flag indicating missing OCTS frame. (0: normal, 1: miss) eng_qual s, 24 "rec","flag" "Engineering data-out-ofrange Byte 24 s Flags indicating abnormal telemetry flags" value. (0: normal, 1: illegal, 3: upper limit over, 5: lower limit over, 9: rate of change limit over )

12 V group s_satp 8, 2 s : [v,g] 8, 10 s : [v,l] 4, 2 s : [t,g] 4, 10 s : [t,l] "bands", "lines" VH : long_ VH : valid_range / "Number of saturated pixels per band" Type Size Short 32 s : [v,g] Number of saturated pixels per 160 s : [v,l] band. 16 s : [t,g] 80 s : [t,l] pre s, 128 "rec","pref" "Prefix data" Byte 128 s Prefix data of Level-0. pxl n "pxls" "Column direction address Short 2 n Column direction addresses of of pixels" pixels calculating latitude and longitude. det 2 : [L] "dets" "Detector number of valid_range = (1, 10) Short 4 : [L] Detector number of pixels 1 : [G] pixels" 2 : [G] calculating latitude and longitude. lat s, n : [v,g] "rec","pxls" : "Scan point latitude" valid_range = Real 4 n s : [v,g] Latitude of above addressed pixels. 8, 2 s, n : [v,l] [G] (-90, 90) 64 n s : s, n : [t,g] "bands","rec2", [v,l] 4, 2 s, n : [t,l] "pxls" : [L] 4 n s : [t,g] 32 n s : [t,l] lon s, n : [v,g] "rec","pxls" : "Scan point longitude" valid_range = Real 4 n s : [v,g] Longitude of above addressed 8, 2 s, n : [v,l] [G] (-180, 180) 64 n s : pixels. s, n : [t,g] "bands","rec2", [v,l] 4, 2 s, n : [t,l] "pxls" : [L] 4 n s : [t,g] 32 n s : [t,l]

13 2.4.2 Raw ADEOS Data V group Raw ADEOS Data V group class Scan_Line_Data [v] : Visible and Near-infrared, [t] : Thermal-infrared, [G] : GAC, [L] : LAC(including ELE)/RTC, [S] : SOL, [O] : LAM s : Number of scans ("Number of Scan Lines" of Data Quality in Global attributes ) p : Number of pixels per line("pixels per Scan Line" of Data Quality in Global attributes ) V group VH : long_ VH : valid_range / octs_tlm s, 120 "rec","instr" "OCTS instrument telemetry" l1a_data 8, 2 s, p : [v,g] "bands", "Level-1A data" valid_ragen = 8, 10 s, 2222 : [v,l] "lines", (0, 1023) 8, 10 s, 180 : [v,s] "nsamp" 8, 10 s, 80 : [v,o] 4, 2 s, p : [t,g] 4, 10 s, 2222 : [t,l] blk_data 8, 10 s,5 : [v] "bands","blines" "Black body data" valid_range = 4, 10 s, 5 : [t],"bsamp" (0, 1023) Type Ushort Ushort Ushort Size 240 s Raw telemetry data in OCTS frame. 32 p s : [v,g] OCTS Level-1A raw data s :[v,l] s : [v,s] 6400 s : [v,o] 16 p s : [t,g] s : [t,l] 800 s : [v] OCTS black body 400 s : [t] observation data.

14 2.4.3 Converted Telemetry V group Converted Telemetry V group class Scan_Line_Data [v] : Visible and Near-infrared, [t] : Thermal-infrared s : Number of scans ("Number of Scan Lines" of Data Quality in Global attributes ) V group VH : long_ VH : valid_range / Type Size sc_time s "rec" "Spacecraft counter time" Ulong 4 s Spacecraft time counter value. off_time s "rec" "Offset time of scan" Ushort 2 s Scan time offset value. (delta T) opr_mode s "rec" "Operation mode" valid_range = (0, 4) Ushort 2 s Observation mode. (DSP status) (observation; OBS = 0, lamp1; LAM = 1, lamp2; LAM = 2, solar; SOL = 3, electronic; ELE = 4) DSP_sys s "rec" "DSP system" valid_range = (2, 4) Ushort 2 s DSP A/B status (A=2, B=4) tilt_flag s "rec" "Tilt angle flag of DSP status" tilt s "rec" "Tilt angle for scan line" valid_range = (-20, 20) valid_range = (1, 4) Ushort 2 s Tilt angle (DSP status : +20 = 1, 0 = 2, -20 = 4) Real 4 s Tilt rotation angle (degrees)

15 V group gain 8, s : [v] 4, s : [t] VH : long_ VH : valid_range / "bands","rec" "Band gain settings" valid_range = (0, 3) : [v] (0, 2) : [t] Type Ushort Size 16 s : [v] Gain setting (O/N = 0, L/N = 1, O/H = 2, L/H = 3, 8 s : [t] G1 = 0, G2 = 1, G3 = 2) SDE_sys s "rec" "SDE system" valid_range = (1, 2) Ushort 2 s SDE (Scan Drive Electronic) system (A = 1, B = 2) inst_temp s, 4 "rec","instt" "Instrument temperature telemetry" bb_temp s, 5 "rec","bbt" "Black body temperature telemetry" AMUX_v s "rec" "Analog multiplexer voltage" const_i s "rec" "Constant current calibration signal sc_att s, 3 "rec","vec" "Spacecraft attitude roll, pitch, yaw" = "degrees" Real 16 s Temperature of OCTS instrument (Optical processing cover temp., Thermal infrared detector temp.(detail), SRU temp.2, SRU temp.1) = "degrees" Real 20 s Black body temperature. (standard black body temperature 1-5) = "voltages" Real 4 s Analog multiplexer voltage. = "voltages" Real 4 s Constant current calibration signal. valid_range = (-180, 180) = "degrees" Real 12 s Attitude angle. (roll, pitch, yaw)

16 2.4.4 Navigation V group Navigation V group class Scan_Line_Data s : Number of scans ("Number of Scan Lines" of Data Quality in Global attributes ) V group VH : long_ VH : valid_range / Type Size orb_vec s, 3 "rec","vec" "Orbit position vector at valid_range = Real 12 s Orbit position vector in ECR X, Y, Z scan line time in ECR" (-7200, 7200) = "kilometers" orb_vel s, 3 "rec","vec" "Orbit velocity at scan line valid_range = (-8, 8) Real 12 s Spacecraft velocity vector in ECR frame. time in ECR" = "kilometers second^-1" sun_ref s, 3 "rec","vec" "Reference Sun vector in Real 12 s Sun vector in the ECR frame. ECR frame" (Units = meters) att_ang s, 3 "rec","vec" "Computed roll, pitch, valid_range = Real 12 s Attitude angle. (roll, pitch, yaw) yaw" (-180, 180) = "degrees"

17 2.4.5 Sensor Tilt V group Sensor Tilt V group class Scan_Line_Data V group VH : long_ VH : valid_range / Type Size tilt_seg 1 "tilts" "Tilt segment number" valid_range = (1, 5) Short 2 Tilt segment number. 1 : tilt angle = 0 degree (northern), 2 : tilt angle = -20 degrees, 3 : tilt angle = 20 degrees, 4 : tilt angle = 0 degree (southern), 5 : calibration data / nighttime observation data

18 2.4.6 Calibration V group Calibration Parameter V group class [v] : Visible and Near-infrared, [t] : Thermal-infrared s : Number of scans ("Number of Scan Lines" of Data Quality in Global attributes ) k : Size of Radiance-temperature conversion table ( dimension of which V group is "temp" ) n : Size of Radiometric correction table (number of break points) ( value of which V group is "rad_tbl_size" ) V group VH : long_ VH : valid_range / Type Size t_gain 4, 8, 10 "gains","bands", "Total gain" = Real 1280 OCTS total gain at each gain "detectors" "W^-1 m^2 um sr" setting. (only for Visible and near infrared) t_offset 4, 8, 10 : [v] "gains","bands", "Total offset" = Real 1280 : [v] OCTS total offset. 3, 4, 10 : [t] "detectors" "digital counts" 480 : [t] beta_d 8, 10 : [v] 4, 10 : [t] "bands", "detectors" "Temperature correction coefficients beta d" = "kelvin^-1" Real 320 : [v] 160 : [t] Temperature correction coefficient b d beta_p 8, 10 : [v] 4, 10 : [t] "bands", "detectors" "Temperature correction coefficients beta p" = "kelvin^-1" Real 320 : [v] 160 : [t] Temperature correction coefficient b p

19 V group VH : long_ beta_am 8, 10 : [v] "bands", "Temperature correction 4, 10 : [t] "detectors" coefficients beta am" beta_ad 4, 8 : [v] "gains","bands" "Temperature correction 3, 4 : [t] coefficients beta ad" beta_oam 8, 10 : [v] "bands", "Temperature correction 4, 10 : [t] "detectors" coefficients beta Oam" beta_oad 4, 8 : [v] "gains","bands" "Temperature correction 3, 4 : [t] coefficients beta Oad" ref_temp 1 "reft" "Reference temperature for temperature correction coefficients" eta 8 : [v] "bands" "Reflecting ratio 4 : [t] correction coefficients" linearity_v 4, 10, 20 "bands", "Output voltage of thermal "detectors", infrared linearity table" "tdatas" VH : valid_range / Type Size = "kelvin^-1" Real 320 : [v] 160 : [t] = "kelvin^-1" Real 128 : [v] 48 : [t] = "kelvin^-1" Real 320 : [v] 160 : [t] = "kelvin^-1" Real 128 : [v] 48 : [t] Temperature correction coefficient b am Temperature correction coefficient b ad Temperature correction coefficient b Oam Temperature correction coefficient b Oad = "celsius" Real 4 Standard temperature of temperature correction coefficient. Real 32 : [v] Reflecting ratio correction coefficient 16 : [t] of reflecting mirror. = "voltage" Real 3200 Output voltage of Thermal infrared non-linearity table. (only for Thermal infrared)

20 V group VH : long_ linearity_r 4, 10, 20 "bands", "Input radiance of thermal "detectors", infrared linearity table" "tdatas" temp k "rdatas" "Radiance-temperature conversion table temperature" rad 4, k "bands", "rdatas" "Radiance-temperature conversion table radiance" opt_vec 8, 10, 3 : [v] "bands", "View vector at optical 4, 10, 3 : [t] "detectors", unit" "vec" opt_a 3, 3 "mat","vec" "Alignment matrix of OPT coordinates" mirror_e 1 "err" "Scan mirror mounting error" VH : valid_range Type / = "W^-1 m^2 sr" Real Size 3200 Input radiance of Thermal infrared non-linearity table. (only for Thermal infrared) = "kelvin" Real 16 k Radiance-temperature conversion table temperature. (only for Thermal infrared) = "W m^-2 sr^-1" valid range = (-1, 1) valid range = (-1, 1) Real Real Real 16 k Radiance-temperature conversion table radiance. (only for Thermal infrared) 960 : [v] View line of optical unit of each detector at 480 : [t] OCTS standard coordinate system. (only for observation mode) 36 Matrix of optical system coordinate. (convert to OCTS reference coordinate system by multiplying. Matrix is arranged by following order: 1 st column row1, row2 row3, 2 nd column row1, row2, row3 and 3 rd column row1, row2, row3.) (only for observation mode) = "sec" Real 4 Mounting error of scan mirror. (asec) (only for observation mode)

21 V group VH : long_ VH : valid_range / Type Size scan_axis_e 1 "err" "Scan axis mounting error" = "sec" Real 4 Mounting error of scan axis. (asec) (only for observation mode) scan_m_a 3, 3 "mat","vec" "Alignment matrix of SMA coordinates" Real Matrix of scan axis coordinate. (convert 36 to OCTS reference coordinate system by multiplying. Matrix is arranged same as opt_a.) (only for observation mode) scan_ang 2222 "pixels" "Scan rotation angle" Real 8888 Scan rotation angle of each pixel to first detector. (degrees) (only for observation mode) rad_tbl_size 1 "rads" "Radiometric correction table size" rad_tbl 8, 10, n, 2 : [v] "bands", "Radiometric correction "detectors", 4, 10, n, 2 : [t] table" "bdatas", "pairs" rad_coef 8, s, 10, 4 : [v] "bands", "Radiometric correction "rec", 4, s, 10, 4 : [t] coefficients" "detectors", "coefs" Short Real Real 2 Size of radiometric correction table. (number of break point) (= n) 640 n : [v] Radiometric correction table. (pair of 320 n : [t] input and output) 1280 s : [v] Radiometric correction coefficients. 640 s : [t] aí, bí, cí, dí

22 2.4.7 Spacecraft Time Error V group Spacecraft Time Error V group class Ephemeris_Data n : Number of time error information sets (value of which V group is "num_inf" ) V group VH : long_ num_inf 1 "ninf" "Number of time difference data" obit_count n "ndatas" "Orbit accumulation number" start_time n "ndatas22" "Start time of time difference data" end_time n "ndatas22" "End time of time difference data" period_count n "ndatas14" "Counter period of SC clock" VH : valid_range / Type Size Short 2 Number of time error collection information sets (= n) Long 4 n Integrated orbit number used in calculation. Ch 22 n Valid period of time error collection information (start) "YYYYMMDD hh:mm:ss.ttt" Ch 22 n Valid period of time error collection information (end) "YYYYMMDD hh:mm:ss.ttt" Ch 14 n Period of spacecraft counter "NN.NNNNNNNNNN"

23 V group VH : long_ VH : valid_range / Type Size ref_count n "ndatas12" "Reference counter of SC Ch 12 n Reference spacecraft time counter value. clock" "NNNNNNNNNNN" ref_time n "ndatas22" "Reference time (UT) of Ch 22 n Reference time. (UTC) ground" "YYYYMMDD hh:mm:ss.ttt"

24 2.4.8 Orbit Data V group Orbit Data V group class Ephemeris_Data m : Number of orbit records (value of which V group is "num_rec") V group VH : long_ VH : valid_range / Type Size num_rec 1 "nrec" "Number of records" Long 4 Number of orbit data records. (= m) precision m "odatas" "Orbit data precision" Short 2 m Precision of orbit data. (preliminary=0 / decision=1) utc_tai m "odatas" "UTC-TAI" = "seconds" Long 4 m UTC - TAI ut1r_tai m "odatas" "UT1R-TAI" = "seconds" Double 8 m UT1R - TAI polar_motion m, 2 "odatas", "pairs" "Polar motion parameters" Double 16 m Polar motion data. Xpm and Ypm (asec) start_date m "odatas22" "Orbit data start date" Ch 22 m Start time of orbit data. "YYYYMMDD hh:mm:ss.000" interval m "odatas" "Data interval time" = "seconds" Double 8 m Data interval. num_points m "odatas" "Number of data points" Long 4 m Number of data points. (= 1440)

25 V group VH : long_ VH : valid_range / Type Size sc_pos m, 1440, 3 "odatas", "Spacecraft position" valid range = Double m Spacecraft position vector in ECI frame. "points", (-7200, 7200) "vec" = "kilometers" sc_vel m, 1440, 3 "odatas", "Spacecraft velocity" valid range = (-8, 8) Double m Spacecraft velocity vector in ECI frame. "points", = "kilometers "vec" second^-1"

26 2.4.9 Subsampling Table Only for GAC. Not including for RTC and LAC V group Subsampling Table V group class Sub_Sampling_Data n : Number of subsampling table (value of which V group is "num_tables") V group VH : long_ VH : valid_range / num_tables 1 "ntbl" "Number of subsampling tables" Type Size Short 2 Number of subsampling tables (=n) (only for GAC) start_line n "sline" "Start scan line of table" Short 2 n Start scan line number of subsampling tables (n) (only for GAC) samp_table n, 3, 8, 2, p, 2 : "sets","ntilt", "Subsampling table" Short 192 p n : [v] Subsampling tables (only for [v] "bands","sdet", 96 p n : [t] GAC) n, 3, 4, 2, p, 2 : "nsamp", [t] "pairs"