netcdf sgpsphotcod2chiuC1.c1.20210531.000230 { dimensions: time = UNLIMITED ; // (116 currently) bound = 2 ; gain = 3 ; channel = 6 ; modis_channel = 7 ; variables: int base_time ; base_time:string = "2021-05-31 00:00:00 0:00" ; base_time:long_name = "Base time in Epoch" ; base_time:units = "seconds since 1970-1-1 0:00:00 0:00" ; base_time:ancillary_variables = "time_offset" ; double time_offset(time) ; time_offset:long_name = "Time offset from base_time" ; time_offset:units = "seconds since 2021-05-31 00:00:00 0:00" ; time_offset:ancillary_variables = "base_time" ; double time(time) ; time:long_name = "Time offset from midnight" ; time:units = "seconds since 2021-05-31 00:00:00 0:00" ; time:bounds = "time_bounds" ; time:standard_name = "time" ; double time_bounds(time, bound) ; time_bounds:long_name = "Time cell bounds" ; time_bounds:bound_offsets = -150., 150. ; int gain(gain) ; gain:long_name = "Coordinate variable for gain" ; gain:units = "1" ; gain:flag_values = 0, 1, 2 ; gain:flag_meanings = "A_(Aureole_Gain) K_(Sky_Gain) Mean_of_A_and_K" ; int modis_channel(modis_channel) ; modis_channel:long_name = "Coordinate variable for modis_channel" ; modis_channel:units = "1" ; float modis_wavelength(modis_channel) ; modis_wavelength:long_name = "Central wavelength of modis_channel" ; modis_wavelength:units = "nm" ; modis_wavelength:missing_value = -9999.f ; float modis_white_sky_albedo(modis_channel) ; modis_white_sky_albedo:long_name = "Area average of white sky albedo for modis_channel" ; modis_white_sky_albedo:units = "1" ; modis_white_sky_albedo:comment = "Area 9x9 MODIS pixel i.e. 4.5 by 4.5 km" ; modis_white_sky_albedo:missing_value = -9999.f ; modis_white_sky_albedo:ancillary_variables = "qc_modis_white_sky_albedo" ; int qc_modis_white_sky_albedo(modis_channel) ; qc_modis_white_sky_albedo:long_name = "Quality check results on variable: Area average of white sky albedo for modis_channel" ; qc_modis_white_sky_albedo:units = "1" ; qc_modis_white_sky_albedo:standard_name = "quality_flag" ; qc_modis_white_sky_albedo:description = "This variable contains integer values indicating the results of a QC test on the data." ; qc_modis_white_sky_albedo:flag_values = "0, 1, 2, 3, 255" ; qc_modis_white_sky_albedo:flag_meanings = "Best_quality,_full_inversion_(WoDs,_RMSE_majority_good) Good_quality,_full_inversion Magnitude_inversion_(numobs_>=_7) Magnitude_inversion_(numobs_>=_2_&_<_7) data_missing" ; qc_modis_white_sky_albedo:flag_assessments = "Acceptable Acceptable Acceptable Acceptable Bad" ; int channel(channel) ; channel:long_name = "Nominal wavelength for channel" ; channel:units = "nm" ; float wavelength(channel) ; wavelength:long_name = "Effective Wavelength" ; wavelength:units = "um" ; wavelength:missing_value = -9999.f ; float spectral_irradiance_at_toa(channel) ; spectral_irradiance_at_toa:long_name = "Spectral Irradiance at TOA" ; spectral_irradiance_at_toa:units = "W m-2 um-1" ; spectral_irradiance_at_toa:missing_value = -9999.f ; float solar_zenith_angle(time) ; solar_zenith_angle:long_name = "Solar zenith angle" ; solar_zenith_angle:units = "degree" ; solar_zenith_angle:standard_name = "solar_zenith_angle" ; solar_zenith_angle:missing_value = -9999.f ; float radiance_0440(time, gain) ; radiance_0440:long_name = "Normalized zenith radiance at 440nm" ; radiance_0440:units = "1" ; radiance_0440:comment = "Calibrated and normalized by spectral irradiance at TOA" ; radiance_0440:missing_value = -9999.f ; float radiance_0870(time, gain) ; radiance_0870:long_name = "Normalized zenith radiance at 870nm" ; radiance_0870:units = "1" ; radiance_0870:comment = "Calibrated and normalized by spectral irradiance at TOA" ; radiance_0870:missing_value = -9999.f ; float radiance_1640(time, gain) ; radiance_1640:long_name = "Normalized zenith radiance at 1640nm" ; radiance_1640:units = "1" ; radiance_1640:comment = "Calibrated and normalized by spectral irradiance at TOA" ; radiance_1640:missing_value = -9999.f ; float cloud_optical_depth(time, gain) ; cloud_optical_depth:long_name = "Cloud Optical Depth" ; cloud_optical_depth:units = "1" ; cloud_optical_depth:missing_value = -9999.f ; cloud_optical_depth:standard_name = "atmosphere_optical_thickness_due_to_cloud" ; cloud_optical_depth:ancillary_variables = "retrieval_flag cloud_optical_depth_std" ; float cloud_optical_depth_std(time, gain) ; cloud_optical_depth_std:long_name = "Standard deviation of cloud optical depth" ; cloud_optical_depth_std:units = "1" ; cloud_optical_depth_std:missing_value = -9999.f ; cloud_optical_depth_std:cell_methods = "time: standard_deviation" ; float liquid_water_path(time, gain) ; liquid_water_path:long_name = "Liquid Water Path" ; liquid_water_path:units = "g/m2" ; liquid_water_path:missing_value = -9999.f ; liquid_water_path:standard_name = "atmosphere_mass_content_of_cloud_liquid_water" ; liquid_water_path:ancillary_variables = "retrieval_flag liquid_water_path_std" ; float liquid_water_path_std(time, gain) ; liquid_water_path_std:long_name = "Standard deviation of liquid water path" ; liquid_water_path_std:units = "g/m2" ; liquid_water_path_std:missing_value = -9999.f ; liquid_water_path_std:cell_methods = "time: standard_deviation" ; float effective_radius(time, gain) ; effective_radius:long_name = "Effective radius" ; effective_radius:units = "um" ; effective_radius:missing_value = -9999.f ; effective_radius:standard_name = "effective_radius_of_cloud_liquid_water_particles" ; effective_radius:ancillary_variables = "retrieval_flag effective_radius_std" ; float effective_radius_std(time, gain) ; effective_radius_std:long_name = "Standard deviation of effective radius" ; effective_radius_std:units = "um" ; effective_radius_std:missing_value = -9999.f ; effective_radius_std:cell_methods = "time: standard_deviation" ; int number_of_solutions(time, gain) ; number_of_solutions:long_name = "Number of Solutions" ; number_of_solutions:units = "count" ; number_of_solutions:missing_value = -9999 ; int retrieval_flag(time, gain) ; retrieval_flag:long_name = "Quality check results" ; retrieval_flag:units = "1" ; retrieval_flag:description = "This variable contains bit-packed integer values, where each bit represents a QC test on the data. Non-zero bits indicate the QC condition given in the description for those bits; a value of 0 (no bits set) indicates the data has not failed any QC tests. Blue for 440 nm, Red for 675 nm, and NIR for 870 nm." ; retrieval_flag:standard_name = "quality_flag" ; retrieval_flag:flag_method = "bit" ; retrieval_flag:bit_1_description = "abs((870-870k)/870) >0 .2 or abs((440-440k)/440) > 0.2 : The relative difference between radiances measured from the Sun and the Sky collimators exceeds 20% either at Blue or NIR. This is unexpected and thus excluded in the retrieval." ; retrieval_flag:bit_1_assessment = "Bad" ; retrieval_flag:bit_2_description = "(440 > 870) and (440-675 < 675-870): Radiance at Blue is larger than that at NIR, suggesting clear-sky conditions. However, radiance differences between Blue, Red, NIR are consistent with cloud signatures over vegetated surface. Since two pieces of information are contradicting each other, the data point is excluded in the retrieval." ; retrieval_flag:bit_2_assessment = "Bad" ; retrieval_flag:bit_3_description = "(440 < 870) and (870-675 <= 1020-870): abs(NIR-RED) < abs(1020-NIR), violating radiative signature in cloud-dominant conditions, and hence excluded." ; retrieval_flag:bit_3_assessment = "Bad" ; retrieval_flag:bit_4_description = "(440 < 870) and (870-675 <= 675-440): abs(NIR-RED) < abs(RED-Blue), violating radiative signature in cloud-dominant conditions, and hence excluded." ; retrieval_flag:bit_4_assessment = "Bad" ; retrieval_flag:bit_5_description = "(440 < 870) and (870-675 <= 675-440) and (870-675 <= 1020-870): Simultaneous violations found in Bit3 and Bit 4." ; retrieval_flag:bit_5_assessment = "Bad" ; retrieval_flag:bit_6_description = "Number of solutions < 15" ; retrieval_flag:bit_6_assessment = "Bad" ; retrieval_flag:bit_7_description = "Missing data" ; retrieval_flag:bit_7_assessment = "Bad" ; float lat ; lat:long_name = "North latitude" ; lat:units = "degree_N" ; lat:valid_min = -90.f ; lat:valid_max = 90.f ; lat:standard_name = "latitude" ; float lon ; lon:long_name = "East longitude" ; lon:units = "degree_E" ; lon:valid_min = -180.f ; lon:valid_max = 180.f ; lon:standard_name = "longitude" ; float alt ; alt:long_name = "Altitude above mean sea level" ; alt:units = "m" ; alt:standard_name = "altitude" ; // global attributes: :command_line = "sphotcod2chiu -s sgp -f C1 -b 20210531 -R" ; :Conventions = "ARM-1.3" ; :process_version = "vap-sphotcod2chiu-1.0-0.el7" ; :dod_version = "sphotcod2chiu-c1-2.0" ; :input_datastreams = "sgpcsphotzenradv3C1.a1 : 1.0 : 20210530.120602-20210531.120905" ; :site_id = "sgp" ; :platform_id = "sphotcod2chiu" ; :facility_id = "C1" ; :data_level = "c1" ; :location_description = "Southern Great Plains (SGP), Lamont, Oklahoma" ; :datastream = "sgpsphotcod2chiuC1.c1" ; :doi = "10.5439/1668057" ; :history = "created by user malynn on machine agate at 2022-09-06 22:45:23, using vap-sphotcod2chiu-1.0-0.el7" ; }