netcdf sgpswatsE4.b1.20110926.000700 { dimensions: time = UNLIMITED ; // (15 currently) depth = 8 ; variables: int base_time ; base_time:string = "26-Sep-2011,0:07:00 GMT" ; base_time:long_name = "Base time in Epoch" ; base_time:units = "seconds since 1970-1-1 0:00:00 0:00" ; double time_offset(time) ; time_offset:long_name = "Time offset from base_time" ; time_offset:units = "seconds since 2011-09-26 00:07:00 0:00" ; double time(time) ; time:long_name = "Time offset from midnight" ; time:units = "seconds since 2011-09-26 00:00:00 0:00" ; int qc_time(time) ; qc_time:long_name = "Quality check results on field: Time offset from midnight" ; qc_time:units = "unitless" ; qc_time:description = "This field contains bit packed values which should be interpreted as listed. No bits set (zero) represents good data." ; qc_time:bit_1_description = "Delta time between current and previous samples is zero." ; qc_time:bit_1_assessment = "Indeterminate" ; qc_time:bit_2_description = "Delta time between current and previous samples is less than the delta_t_lower_limit field attribute." ; qc_time:bit_2_assessment = "Indeterminate" ; qc_time:bit_3_description = "Delta time between current and previous samples is greater than the delta_t_upper_limit field attribute." ; qc_time:bit_3_assessment = "Indeterminate" ; qc_time:delta_t_lower_limit = 3600. ; qc_time:delta_t_upper_limit = 3600. ; qc_time:prior_sample_flag = 1 ; qc_time:comment = "If the \'prior_sample_flag\' is set the first sample time from a new raw file will be compared against the time just previous to it in the stored data. If it is not set the qc_time value for the first sample will be set to 0." ; int depth(depth) ; depth:long_name = "Sensor depth below surface" ; depth:units = "cm" ; depth:resolution = 1 ; depth:accuracy = "1 cm" ; float tref(time) ; tref:long_name = "Reference thermistor temperature" ; tref:units = "C" ; tref:valid_min = -25.f ; tref:valid_max = 50.f ; tref:valid_delta = 20.f ; tref:resolution = 0.1f ; tref:missing_value = -9999.f ; tref:accuracy = "0.2 C" ; int qc_tref(time) ; qc_tref:long_name = "Quality check results on field: Reference thermistor temperature" ; qc_tref:units = "unitless" ; qc_tref:description = "See global attributes for individual bit descriptions." ; float tsoil_w(time, depth) ; tsoil_w:long_name = "Soil temperature, west profile" ; tsoil_w:units = "C" ; tsoil_w:valid_min = -20.f ; tsoil_w:valid_max = 50.f ; tsoil_w:valid_delta = 20.f ; tsoil_w:resolution = 0.1f ; tsoil_w:missing_value = -9999.f ; tsoil_w:accuracy = "0.5 C" ; int qc_tsoil_w(time, depth) ; qc_tsoil_w:long_name = "Quality check results on field: Soil temperature, west profile" ; qc_tsoil_w:units = "unitless" ; qc_tsoil_w:description = "See global attributes for individual bit descriptions." ; float trise_w(time, depth) ; trise_w:long_name = "Sensor temperature rise, west profile" ; trise_w:units = "C" ; trise_w:valid_min = 1.f ; trise_w:valid_max = 4.5f ; trise_w:valid_delta = 3.5f ; trise_w:resolution = 0.01f ; trise_w:missing_value = -9999.f ; trise_w:accuracy = "0.04 C" ; int qc_trise_w(time, depth) ; qc_trise_w:long_name = "Quality check results on field: Sensor temperature rise, west profile" ; qc_trise_w:units = "unitless" ; qc_trise_w:description = "See global attributes for individual bit descriptions." ; float trise_ref_w(time, depth) ; trise_ref_w:long_name = "Reference sensor temperature rise, west profile" ; trise_ref_w:units = "deg C" ; trise_ref_w:valid_min = 1.38f ; trise_ref_w:valid_max = 3.96f ; trise_ref_w:valid_delta = 2.58f ; trise_ref_w:missing_value = -9999.f ; trise_ref_w:accuracy = "0.04 C" ; int qc_trise_ref_w(time, depth) ; qc_trise_ref_w:long_name = "Quality check results on field: Reference sensor temperature rise, west profile" ; qc_trise_ref_w:units = "unitless" ; qc_trise_ref_w:description = "See global attributes for individual bit descriptions." ; float fwi_w(time, depth) ; fwi_w:long_name = "Fractional water index, west profile" ; fwi_w:units = "unitless" ; fwi_w:valid_min = 0.f ; fwi_w:valid_max = 1.f ; fwi_w:valid_delta = 1.f ; fwi_w:missing_value = -9999.f ; fwi_w:equation = "(3.96 - trise_ref_w)/(3.96 - 1.38)" ; int qc_fwi_w(time, depth) ; qc_fwi_w:long_name = "Quality check results on field: Fractional water index, west profile" ; qc_fwi_w:units = "unitless" ; qc_fwi_w:description = "See global attributes for individual bit descriptions." ; float soilwatpot_w(time, depth) ; soilwatpot_w:long_name = "Soil water potential, west profile" ; soilwatpot_w:units = "kPa" ; soilwatpot_w:valid_min = -7000.f ; soilwatpot_w:valid_max = 0.f ; soilwatpot_w:valid_delta = 7000.f ; soilwatpot_w:missing_value = -9999.f ; int qc_soilwatpot_w(time, depth) ; qc_soilwatpot_w:long_name = "Quality check results on field: Soil water potential, west profile" ; qc_soilwatpot_w:units = "unitless" ; qc_soilwatpot_w:description = "See global attributes for individual bit descriptions." ; float watcont_w(time, depth) ; watcont_w:long_name = "Volumetric water content, west profile" ; watcont_w:units = "m^3/m^3" ; watcont_w:valid_min = 0.f ; watcont_w:valid_max = 0.55f ; watcont_w:valid_delta = 0.55f ; watcont_w:missing_value = -9999.f ; int qc_watcont_w(time, depth) ; qc_watcont_w:long_name = "Quality check results on field: Volumetric water content, west profile" ; qc_watcont_w:units = "unitless" ; qc_watcont_w:description = "See global attributes for individual bit descriptions." ; float tsoil_e(time, depth) ; tsoil_e:long_name = "Soil temperature, east profile" ; tsoil_e:units = "C" ; tsoil_e:valid_min = -20.f ; tsoil_e:valid_max = 50.f ; tsoil_e:valid_delta = 20.f ; tsoil_e:resolution = 0.1f ; tsoil_e:missing_value = -9999.f ; tsoil_e:accuracy = "0.5 C" ; int qc_tsoil_e(time, depth) ; qc_tsoil_e:long_name = "Quality check results on field: Soil temperature, east profile" ; qc_tsoil_e:units = "unitless" ; qc_tsoil_e:description = "See global attributes for individual bit descriptions." ; float trise_e(time, depth) ; trise_e:long_name = "Sensor temperature rise, east profile" ; trise_e:units = "C" ; trise_e:valid_min = 1.f ; trise_e:valid_max = 4.5f ; trise_e:valid_delta = 3.5f ; trise_e:resolution = 0.01f ; trise_e:missing_value = -9999.f ; trise_e:accuracy = "0.04 C" ; int qc_trise_e(time, depth) ; qc_trise_e:long_name = "Quality check results on field: Sensor temperature rise, east profile" ; qc_trise_e:units = "unitless" ; qc_trise_e:description = "See global attributes for individual bit descriptions." ; float trise_ref_e(time, depth) ; trise_ref_e:long_name = "Reference sensor temperature rise, east profile" ; trise_ref_e:units = "C" ; trise_ref_e:valid_min = 1.38f ; trise_ref_e:valid_max = 3.96f ; trise_ref_e:valid_delta = 2.58f ; trise_ref_e:missing_value = -9999.f ; trise_ref_e:accuracy = "0.04 C" ; int qc_trise_ref_e(time, depth) ; qc_trise_ref_e:long_name = "Quality check results on field: Reference sensor temperature rise, east profile" ; qc_trise_ref_e:units = "unitless" ; qc_trise_ref_e:description = "See global attributes for individual bit descriptions." ; float fwi_e(time, depth) ; fwi_e:long_name = "Fractional water index, east profile" ; fwi_e:units = "unitless" ; fwi_e:valid_min = 0.f ; fwi_e:valid_max = 1.f ; fwi_e:valid_delta = 1.f ; fwi_e:missing_value = -9999.f ; fwi_e:equation = "(3.96 - trise_ref_e)/(3.96 - 1.38)" ; int qc_fwi_e(time, depth) ; qc_fwi_e:long_name = "Quality check results on field: Fractional water index, east profile" ; qc_fwi_e:units = "unitless" ; qc_fwi_e:description = "See global attributes for individual bit descriptions." ; float soilwatpot_e(time, depth) ; soilwatpot_e:long_name = "Soil water potential, east profile" ; soilwatpot_e:units = "kPa" ; soilwatpot_e:valid_min = -7000.f ; soilwatpot_e:valid_max = 0.f ; soilwatpot_e:valid_delta = 7000.f ; soilwatpot_e:missing_value = -9999.f ; int qc_soilwatpot_e(time, depth) ; qc_soilwatpot_e:long_name = "Quality check results on field: Soil water potential, east profile" ; qc_soilwatpot_e:units = "unitless" ; qc_soilwatpot_e:description = "See global attributes for individual bit descriptions." ; float watcont_e(time, depth) ; watcont_e:long_name = "Volumetric water content, east profile" ; watcont_e:units = "m^3/m^3" ; watcont_e:valid_min = 0.f ; watcont_e:valid_max = 0.55f ; watcont_e:valid_delta = 0.55f ; watcont_e:missing_value = -9999.f ; int qc_watcont_e(time, depth) ; qc_watcont_e:long_name = "Quality check results on field: Volumetric water content, east profile" ; qc_watcont_e:units = "unitless" ; qc_watcont_e:description = "See global attributes for individual bit descriptions." ; int serial_numbers_w(depth) ; serial_numbers_w:long_name = "West profile sensor serial numbers" ; serial_numbers_w:units = "unitless" ; serial_numbers_w:missing_value = -9999 ; int serial_numbers_e(depth) ; serial_numbers_e:long_name = "East profile sensor serial numbers" ; serial_numbers_e:units = "unitless" ; serial_numbers_e:missing_value = -9999 ; float lat ; lat:long_name = "North latitude" ; lat:units = "degree_N" ; lat:valid_min = -90.f ; lat:valid_max = 90.f ; float lon ; lon:long_name = "East longitude" ; lon:units = "degree_E" ; lon:valid_min = -180.f ; lon:valid_max = 180.f ; float alt ; alt:long_name = "Altitude above mean sea level" ; alt:units = "m" ; // global attributes: :command_line = "swats_ingest -s sgp -f E4 -R -d" ; :process_version = "ingest-swats-11.3-0.el5" ; :dod_version = "swats-b1-2.2" ; :site_id = "sgp" ; :facility_id = "E4: Plevna, Kansas" ; :data_level = "b1" ; :input_source = "/data/collection/sgp/sgpswatsE4.00/1316995620.icm" ; :resolution_description = "The resolution field attributes refer to the number of significant digits relative to the decimal point that should be used in calculations. Using fewer digits might result in greater uncertainty. Using a larger number of digits should have no effect and thus is unnecessary. However, analyses based on differences in values with a larger number of significant digits than indicated could lead to erroneous results or misleading scientific conclusions.\n", "\n", "resolution for lat = 0.001\n", "resolution for lon = 0.001\n", "resolution for alt = 1" ; :sampling_interval = "1 hour" ; :averaging_interval = "None" ; :serial_number = "See serial_number data for East and West profiles" ; :profile_distance = "1.0 meter between East and West sensor profiles." ; :ref_therm_location = "The reference thermistor is located inside the electronics enclosure which is mounted on posts above the soil surface. That makes it 1.2m south of the two sensor profiles and 50 cm above the soil surface." ; :unit_comment = "kPa is kilopascals, m3/m3 is cubic meters of water per cubic meter of soil." ; :soil_characterization = "West 5cm loamy-sand\n", "West 15cm loamy-sand\n", "West 25cm sand\n", "West 35cm sand\n", "West 60cm loamy-sand\n", "West 85cm loamy-sand\n", "West 125cm loamy-sand\n", "West 175cm loamy-sand\n", "East 5cm loamy-sand\n", "East 15cm loamy-sand\n", "East 25cm sand\n", "East 35cm sand\n", "East 60cm loamy-sand\n", "East 85cm loamy-sand\n", "East 125cm loamy-sand\n", "East 175cm loamy-sand" ; :calib_description = "Calibration/Calculation Technique for determining Soil Water Potential and\n", "Volumetric Water Content from the measured SWATS temperature rise values.\n", "\n", " Adjustment of individual sensor responses to the \"reference\" sensor response\n", " to remove sensor-to-sensor variability. Coefficients m and b are unique for\n", " each individual sensor.\n", "\n", " dTref = m * dTsensor + b\n", "\n", " where:\n", "\n", " dTref = \"reference\" sensor response (C)\n", " dTsensor = individual sensor response (C)\n", " m = slope\n", " b = intercept\n", "\n", " Note: The dTsensor value is input from the \'trise\' fields as reported by\n", " the instrument. However, the dTref value calculated here is NOT the value\n", " stored in the \'tref\' field. This dTref value is stored in the \'trise_ref\' fields and used in the following calculation.\n", "\n", " Second generation calibration used to calculate the soil water potential.\n", "\n", " psi = -c * exp(a * dTref)\n", "\n", " where:\n", "\n", " psi = soil water potential (kPa)\n", " a = 1.788\n", " c = 0.717\n", "\n", " Note: The value stored in the \'soilwatpot\' field is psi.\n", "\n", " Second generation calibration for estimating the water content as a function\n", " of potential. Coefficients tr, ts, alpha, and n are unique for each different\n", " soil layer at each site.\n", "\n", " theta = tr + (ts - tr)/(1 + (alpha * (-psi/100))^n)^(1 - 1/n)\n", "\n", " where:\n", "\n", " theta = volumetric soil water content (m^3/m^3)\n", " tr = residual water content (m^3/m^3)\n", " ts = saturated water content (m^3/m^3)\n", " alpha = empirical constant\n", " n = empirical constant\n", " psi = potential (kPa)\n", "\n", " Note: The value stored in the \'watcont\' field is theta." ; :calib_coefficients = "loc sn m b tr ts alpha n\n", "w5 1942 0.863 -0.044 0.052 0.332 156.854 1.361\n", "w15 1967 0.921 0.081 0.052 0.332 156.854 1.361\n", "w25 1956 0.875 -0.028 0.069 0.370 64.265 2.480\n", "w35 1897 0.981 0.065 0.069 0.370 64.265 2.480\n", "w60 1993 0.989 0.085 0.044 0.366 30.725 17.444\n", "w85 1988 0.931 0.309 0.044 0.366 30.725 17.444\n", "w125 1944 0.959 -0.030 0.044 0.366 30.725 17.444\n", "w175 1983 0.952 0.123 0.044 0.366 30.725 17.444\n", "e5 1894 -9999 -9999 -9999 -9999 -9999 -9999\n", "e15 1892 0.935 -0.265 0.052 0.332 156.854 1.361\n", "e25 1911 0.996 -0.214 0.069 0.370 64.265 2.480\n", "e35 1898 1.004 -0.156 0.069 0.370 64.265 2.480\n", "e60 1899 0.981 0.095 0.044 0.366 30.725 17.444\n", "e85 3663 0.918 0.049 0.044 0.366 30.725 17.444\n", "e125 2008 0.857 0.214 0.044 0.366 30.725 17.444\n", "e175 1982 0.959 0.143 0.044 0.366 30.725 17.444" ; :qc_standards_version = "1.0" ; :qc_method = "Standard Mentor QC" ; :qc_comment = "The QC field values are a bit packed representation of true/false values for the tests that may have been performed. A QC value of zero means that none of the tests performed on the value failed.\n", "\n", "The QC field values make use of the internal binary format to store the results of the individual QC tests. This allows the representation of multiple QC states in a single value. If the test associated with a particular bit fails the bit is turned on. Turning on the bit equates to adding the integer value of the failed test to the current value of the field. The QC field\'s value can be interpreted by applying bit logic using bitwise operators, or by examining the QC value\'s integer representation. A QC field\'s integer representation is the sum of the individual integer values of the failed tests. The bit and integer equivalents for the first 5 bits are listed below:\n", "\n", "bit_1 = 00000001 = 0x01 = 2^0 = 1\n", "bit_2 = 00000010 = 0x02 = 2^1 = 2\n", "bit_3 = 00000100 = 0x04 = 2^2 = 4\n", "bit_4 = 00001000 = 0x08 = 2^3 = 8\n", "bit_5 = 00010000 = 0x10 = 2^4 = 16" ; :qc_bit_1_description = "Value is equal to missing_value." ; :qc_bit_1_assessment = "Bad" ; :qc_bit_2_description = "Value is less than the valid_min." ; :qc_bit_2_assessment = "Bad" ; :qc_bit_3_description = "Value is greater than the valid_max." ; :qc_bit_3_assessment = "Bad" ; :qc_bit_4_description = "Difference between current and previous values exceeds valid_delta." ; :qc_bit_4_assessment = "Indeterminate" ; :qc_bit_5_description = "One or more input values to an equation are invalid." ; :qc_bit_5_assessment = "Bad" ; :zeb_platform = "sgpswatsE4.b1" ; :history = "created by user dsmgr on machine gold at 13-Oct-2011,16:51:00, using $State: zebra-zeblib-4.22-1.el5 $" ; }