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Data Blocks

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Last Updated On
byLukas Hörtnagl
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Currently in progress… (December 2020)

This page describes the binary data blocks that are stored in the ETH raw binary files for the different instruments.

 

Legend

  • > … big-endian, MSB most-significant Byte at lowest address
  • B … unsigned char, integer, 1 Byte
  • DMF … Dry mole fraction (mixing ratio), e.g. nmol+1 mol-1 (ppb)
  • h … Short integer, 2 Bytes
  • INC .. Inclinometer
  • MD … Molar density, e.g. mmol+1 m-3
  • Old data block name … Data block used to describe the respective format in FCT_FluxCalcTool
  • Old instrument ID in EddyPro … Data block used to describe the respective format in EddyPro
  • QCL … Quantum cascade laser
  • SB .. Status byte, AGC / window dirtiness / signal strenth is kept
  • TS .. Sonic temperature

 

Sonic Anemometers

 

Infrared Gas Analyzers

 

Laser Gas Analyzers

 

 

Sonic Anemometers

HS50-B

Data sequence

  • Big-endian short integers, each record 2 Bytes
  • Total length: 12 Bytes
  • Number of columns: 6
  1. U_HS50, Bytes: 2, Byte format: >h, Gain: 100, Offset: 0, Units: m+1 s-1
  2. V_HS50, Bytes: 2, Byte format: >h, Gain 100, Offset: 0, Units: m+1 s-1
  3. W_HS50, Bytes: 2, Byte format: >h, Gain 100, Offset: 0, Units: m+1 s-1
  4. T_SONIC_HS50, Bytes: 2, Byte format: >h, Gain 100, Offset: 0, Units: K
  5. INC_X_HS50, Bytes: 2, Byte format: >h, Gain 1, Units: deg
  6. INC_Y_HS50, Bytes: 2, Byte format: >h, Gain 1, Units: deg

Notes

  • Old data block name: data_block_sonic_hs_50
  • Old instrument ID in EddyPro: hs-50

 

R2-A

Data sequence

  • Big-endian short integers, each record 2 Bytes
  • Total length: 8 Bytes
  • Number of columns: 4
  • U_R2, Bytes: 2, Byte format: >h, Gain: 100, Offset: 0, Units: m+1 s-1
  • V_R2, Bytes: 2, Byte format: >h, Gain 100, Offset: 0, Units: m+1 s-1
  • W_R2, Bytes: 2, Byte format: >h, Gain 100, Offset: 0, Units: m+1 s-1
  • T_SONIC_R2, Bytes: 2, Byte format: >h, Gain/Offset: for conversion see below, Units: degC
    Conversion of T_SONIC_R2 to °C: ( ( (T_SONIC_R2 * 0.02)^2 ) / 403 ) - 273.15

Notes

  • Old data block name: data_block_sonic_r2_1_without_extrabyte
  • Old instrument ID in EddyPro: r2_1_without_extrabyte

 

R2-A-EB1

Data sequence

  • Big-endian short integers, each record 2 Bytes
  • Total length: 13 Bytes
  • Number of columns: 6 (without extra byte)
  • U_R2, Bytes: 2, Byte format: >h, Gain: 100, Offset: 0, Units: m+1 s-1
  • V_R2, Bytes: 2, Byte format: >h, Gain 100, Offset: 0, Units: m+1 s-1
  • W_R2, Bytes: 2, Byte format: >h, Gain 100, Offset: 0, Units: m+1 s-1
  • T_SONIC_R2, Bytes: 2, Byte format: >h, Gain/Offset: for conversion see below, Units: degC
    Conversion of T_SONIC_R2 to °C: ( ( (T_SONIC_R2 * 0.02)^2 ) / 403 ) - 273.15
  • EXTRABYTE_R2, Bytes: 1, Byte format: B, Gain: 1, Offset: 0, Units: none, not needed, please ignore during conversion
  • INC_X_R2, Bytes: 2, Byte format: >h, Gain: 1, Offset: 0, Units: deg
  • INC_Y_R2, Bytes: 2, Byte format: >h, Gain: 1, Offset: 0, Units: deg

Notes

  • R2 data block with an extra byte in the data stream that can be ignored
  • Old data block name: data_block_sonic_r2_1_with_extrabyte
  • Old instrument ID in EddyPro: r2_1_with_extrabyte

 

Infrared Gas Analyzers

 

IRGA72-A-GN1

Data sequence

  • Total length: 26 Bytes
  • Number of columns: 12
  1. DATA_SIZE_IRGA72, Bytes: 1, Byte format: B, Gain: 1, Offset: 0, Units: Bytes
  2. STATUS_CODE_IRGA72, Bytes: 1, Byte format: B, Gain: 1, Offset: 0, Units: dimensionless
  3. DIAG_VAL_IRGA72, Bytes: 2, Byte format: >h, Gain: 1, Offset: 0, Units: dimensionless  # todo check, read bits
  4. H2O_DMF_IRGA72, Bytes: 3, Byte format: B B B, Gain: 1000, Offset: 0, Units: mmol+1 mol-1
  5. CO2_DMF_IRGA72, Bytes: 3, Byte format: B B B, Gain: 10000 x 0.974, Offset: 0, Units: umol+1 mol-1, needs to be multiplied with 0.974 to yield correct measurement (calibration gas issue) which is done during conversion, i.e. the total gain is 10000 x 0.974
  6. H2O_MD_IRGA72, Bytes: 3, Byte format: B B B, Gain: 1000, Offset: 0, Units: mmol+1 m-3
  7. CO2_MD_IRGA72, Bytes: 3, Byte format: B B B, Gain: 10000 x 0.974, Offset: 0, Units: mmol+1 m-3, needs to be multiplied with 0.974 to yield correct measurement (calibration gas issue) which is done during conversion, i.e. the total gain is 10000 x 0.974
  8. T_CELL_IRGA72, Bytes: 2, Byte format: B B, Gain: 100, Offset: 100, Units: degC
  9. P_CELL_IRGA72, Bytes: 2, Byte format: B B, Gain: 10, Offset: 0, Units: Pa  # todo should be output as hPa?
  10. P_ATM_IRGA72, Bytes: 2, Byte format: B B, Gain: 10, Offset: 0, Units: Pa  # todo should be output as hPa?
  11. COOLER_V_IRGA72, Bytes: 2, Byte format: B B, Gain: 1000, Offset: 0, Units: V  # todo should be output as hPa?
  12. FLOWRATE_IRGA72, Bytes: 2, Byte format: B B, Gain: 1000, Offset: 0, Units: L+1 min-1

Notes

  • Old data block name: data_block_irga_li7200_extended_co2_gain0974
  • Old instrument ID in EddyPro: li-7200_extended_co2_gain0974

 

IRGA72-B

Data sequence

  • Total length: 25 Bytes
  • Number of columns: 12
  1. DATA_SIZE_IRGA72, Bytes: 1, Byte format: B, Gain: 1, Offset: 0, Units: Bytes
  2. STATUS_CODE_IRGA72, Bytes: 1, Byte format: B, Gain: 1, Offset: 0, Units: dimensionless
  3. DIAG_VAL_IRGA72, Bytes: 1, Byte format: B, Gain: 1, Offset: 0, Units: dimensionless  # todo check, read bits
  4. H2O_DMF_IRGA72, Bytes: 3, Byte format: B B B, Gain: 1000, Offset: 0, Units: mmol+1 mol-1
  5. CO2_DMF_IRGA72, Bytes: 3, Byte format: B B B, Gain: 10000, Offset: 0, Units: umol+1 mol-1
  6. H2O_MD_IRGA72, Bytes: 3, Byte format: B B B, Gain: 1000, Offset: 0, Units: mmol+1 m-3
  7. CO2_MD_IRGA72, Bytes: 3, Byte format: B B B, Gain: 10000, Offset: 0, Units: mmol+1 m-3
  8. T_CELL_IRGA72, Bytes: 2, Byte format: B B, Gain: 100, Offset: 100, Units: degC
  9. P_CELL_IRGA72, Bytes: 2, Byte format: B B, Gain: 10, Offset: 0, Units: Pa  # todo should be output as hPa?
  10. P_ATM_IRGA72, Bytes: 2, Byte format: B B, Gain: 10, Offset: 0, Units: Pa  # todo should be output as hPa?
  11. COOLER_V_IRGA72, Bytes: 2, Byte format: B B, Gain: 1000, Offset: 0, Units: V  # todo should be output as hPa?
  12. FLOWRATE_IRGA72, Bytes: 2, Byte format: B B, Gain: 1000, Offset: 0, Units: L+1 min-1

Notes

  • Old data block name: data_block_irga_li7200
  • Old instrument ID in EddyPro: li-7200

 

IRGA72-B-GN1

Data sequence

  • Total length: 25 Bytes
  • Number of columns: 12
  1. DATA_SIZE_IRGA72, Bytes: 1, Byte format: B, Gain: 1, Offset: 0, Units: Bytes
  2. STATUS_CODE_IRGA72, Bytes: 1, Byte format: B, Gain: 1, Offset: 0, Units: dimensionless
  3. DIAG_VAL_IRGA72, Bytes: 1, Byte format: B, Gain: 1, Offset: 0, Units: dimensionless  # todo check, read bits
  4. H2O_DMF_IRGA72, Bytes: 3, Byte format: B B B, Gain: 1000, Offset: 0, Units: mmol+1 mol-1
  5. CO2_DMF_IRGA72, Bytes: 3, Byte format: B B B, Gain: 10000 x 0.974, Offset: 0, Units: umol+1 mol-1, needs to be multiplied with 0.974 to yield correct measurement (calibration gas issue) which is done during conversion, i.e. the total gain is 10000 x 0.974
  6. H2O_MD_IRGA72, Bytes: 3, Byte format: B B B, Gain: 1000, Offset: 0, Units: mmol+1 m-3
  7. CO2_MD_IRGA72, Bytes: 3, Byte format: B B B, Gain: 10000 x 0.974, Offset: 0, Units: mmol+1 m-3, needs to be multiplied with 0.974 to yield correct measurement (calibration gas issue) which is done during conversion, i.e. the total gain is 10000 x 0.974
  8. T_CELL_IRGA72, Bytes: 2, Byte format: B B, Gain: 100, Offset: 100, Units: degC
  9. P_CELL_IRGA72, Bytes: 2, Byte format: B B, Gain: 10, Offset: 0, Units: Pa  # todo should be output as hPa?
  10. P_ATM_IRGA72, Bytes: 2, Byte format: B B, Gain: 10, Offset: 0, Units: Pa  # todo should be output as hPa?
  11. COOLER_V_IRGA72, Bytes: 2, Byte format: B B, Gain: 1000, Offset: 0, Units: V  # todo should be output as hPa?
  12. FLOWRATE_IRGA72, Bytes: 2, Byte format: B B, Gain: 1000, Offset: 0, Units: L+1 min-1

Notes

  • Old data block name: data_block_irga_li7200_co2_gain0974
  • Old instrument ID in EddyPro: li-7200_co2_gain0974

 

IRGA75-A-GN1 todo details

Data sequence

  • Total length: 16 Bytes
  • Number of columns: 8
  1. DS, Byte 0, Length 1, Gain 1, Units: Bytes
  2. SC, Byte 1, Length 1, Gain 1, Units: Bytes
  3. SB, Byte 2, Length 1, Gain 1, Units: 0-100 AGC, only AGC is kept (lower binary nibble)
  4. H2O, Bytes 3-5, Length 3, Gain 1000, Units: mmol m-3
  5. CO2, Bytes 6-8, Length 3, Gain 10000 x 0.974, Units: mmol m-3, needs to be multiplied with 0.974 to yield correct measurement (calibration gas issue) which is done during conversion, i.e. the total gain is 10000 x 0.974
  6. T, Bytes 9-10, Length 2, Gain 100, Offset 100, Units: K, ambient temperature
  7. P, Bytes 11-12, Length 2, Gain 0.1, Units: Pa, ambient pressure, is then immediately converted to hPa by multiplying with 0.01
  8. COOLERV, Bytes 13-15. Lenth 3, Gain 10000, Units: V, cooler voltage

Notes

  • CO2 needs correction due to the Wrong Calibration Gas 2017
  • Old data block name: data_block_irga_li7500_co2_gain0974
  • Old instrument ID in EddyPro: li-7500_co2_gain0974

Quantum Cascade Lasers

QCL-A todo details

Data sequence

  • Total length: 22 Bytes (if not missing data), 2 Bytes (if data missing)
  • Number of columns: 7
  1. DS, Byte 0, Length 1, Gain 1, Units: Bytes
  2. SC, Byte 1, Length 1, Gain 1, Units: dimensionless
  3. CH4, Bytes 2-5, Length 4, Gain 1000, Units: mixing ratio (ppb)
  4. N2O, Bytes 6-9, Length 4, Gain 1000, Units: mixing ratio (ppb)
  5. H2O, Bytes 10-13, Length 4, Gain 1, Units: mixing ratio (ppb)
  6. T, Bytes 14-17, Length 4, Gain 1000, Units: K
  7. P, Bytes 18-21, Length 4, Gain 1000, Units: Torr

Notes

  • in WE’s sonicread.pdf Table 2: Version 1 Variant 6, QC-TILDAS ETHZ, CH4, N2O, H2O, TEMP, PRESS since V. 7.06 (2015-05-18)
  • Old data block name: data_block_qcl_ver1_var6_b
  • Old instrument ID in EddyPro: qcl_v1v6b

 

QCL-A2 todo details

Data sequence

  • Total length: 22 Bytes (if not missing data), 2 Bytes (if data missing)
  • Number of columns: 7
  1. DS, Byte 0, Length 1, Gain 1, Units: Bytes
  2. SC, Byte 1, Length 1, Gain 1, Units: dimensionless
  3. CH4, Bytes 2-5, Length 4, Gain 1000, Units: mixing ratio (ppb)
  4. N2O, Bytes 6-9, Length 4, Gain 1000, Units: mixing ratio (ppb)
  5. (H2O), Bytes 10-13, Length 4, Gain 1, Units: mixing ratio (ppb), is most likely ambient CH4 but looks like H2O
  6. T, Bytes 14-17, Length 4, Gain 1000, Units: K
  7. P, Bytes 18-21, Length 4, Gain 1000, Units: Torr

Notes

  • Variant of QCL-A, with the difference that column 5 is most likely ambient CH4, which was unintentionally logged due to a change (after I think update of the QCL’s TDLWintel software) of the data sequence coming from the QCL.
  • However, since H2O from the QCL raw binaries is not used for fluxes QCL-A can be used instead.
  • in WE’s sonicread.pdf Table 2: Version 1 Variant 6, QC-TILDAS ETHZ, CH4, N2O, H2O, TEMP, PRESS since V. 7.06 (2015-05-18)
  • Old data block name: data_block_qcl_ver1_var6_b
  • Old instrument ID in EddyPro: qcl_v1v6b

 

QCL-B todo details

Data sequence

  • Total length: 14 Bytes (if not missing data), 2 Bytes (if data missing)
  • Number of columns: 5
  1. DS, Byte 0, Length 1, Gain 1, Units: Bytes
  2. SC, Byte 1, Length 1, Gain 1, Units: dimensionless
  3. CH4, Bytes 2-5, Length 4, Gain 1000, Units: mixing ratio (ppb)
  4. N2O, Bytes 6-9, Length 4, Gain 1000, Units: mixing ratio (ppb)
  5. H2O, Bytes 10-13, Length 4, Gain 1, Units: mixing ratio (ppb)

Notes

  • in WE’s sonicread.pdf Table 2: Version 1 Variant 6, QC-TILDAS ETHZ, CH4, N2O, H2O until V. 7.05
  • Old data block name: data_block_qcl_ver1_var6
  • Old instrument ID in EddyPro: qcl_v1v6

 

QCL-D todo details

Data sequence

  • Total length: 18 Bytes (if not missing data), 2 Bytes (if data missing)
  • Number of columns: 6
  1. DS, Byte 0, Length 1, Gain 1, Units: Bytes
  2. SC, Byte 1, Length 1, Gain 1, Units: dimensionless
  3. N2O, Bytes 2-5, Length 4, Gain 1000, Units: mixing ratio (ppb)
  4. CH4, Bytes 6-9, Length 4, Gain 1000, Units: mixing ratio (ppb)
  5. NO2, Bytes 10-13, Length 4, Gain 1000, Units: mixing ratio (ppb)
  6. H2O, Bytes 14-17, Length 4, Gain 1000, Units: mixing ratio (ppb)

Notes

  • in WE’s sonicread.pdf Table 2: Version 1 Variant 5, QCL EMPA, CH4, N2O, NO2, H2O
  • Old data block name: data_block_qcl_ver1_var5
  • Old instrument ID in EddyPro: qcl_v1v5

 

QCL-S1 todo details

Data sequence

  • Total length: 22 Bytes (if not missing data), 2 Bytes (if data missing)
  • Number of columns: 7
  1. DS, Byte 0, Length 1, Gain 1, Units: Bytes
  2. SC, Byte 1, Length 1, Gain 1, Units: dimensionless
  3. CH4, Bytes 2-5, Length 4, Gain 10000, Units: mixing ratio (ppb)
  4. H2O, Bytes 6-9, Length 4, Gain 1000, Units: mixing ratio (ppb)
  5. N2O, Bytes 10-13, Length 4, Gain 10000, Units: mixing ratio (ppb)
  6. (DUMMY), Bytes 14-17, Length 4, Gain 1000, Units: –
  7. T, Bytes 18-21, Length 4, Gain 10000, Units: K

Notes

  • Special case: different column order and N2O, CH4 and cell temperature are amplified, also cell pressure is missing and H2O values are cut-off after two digites after the comma.
  • in WE’s sonicread.pdf Table 2: *not documented*
  • Old data block name: data_block_qcl_ver1_var6_b_ch_cha_2018_2
  • Old instrument ID in EddyPro: qcl_v1v6b_ch-cha_2018_2