netcdf 20031012_chilbolton_classification { dimensions: time = 2871 ; height = 192 ; layer = 1 ; variables: float time(time) ; time:axis = "T" ; time:units = "hours since 2003-10-12 00:00:00 +0:00" ; time:long_name = "Time UTC" ; time:standard_name = "time" ; float height(height) ; height:axis = "Z" ; height:units = "m" ; height:long_name = "Height above mean sea level" ; height:standard_name = "height" ; float latitude ; latitude:units = "degrees_north" ; latitude:long_name = "Latitude of site" ; latitude:standard_name = "latitude" ; float longitude ; longitude:units = "degrees_east" ; longitude:long_name = "Longitude of site" ; longitude:standard_name = "longitude" ; float altitude ; altitude:units = "m" ; altitude:long_name = "Height of radar above mean sea level" ; byte target_classification(time, height) ; target_classification:long_name = "Target classification" ; target_classification:comment = "This variable is a simplification of the bitfield \"category_bits\" in the target categorization and data quality dataset.\n", "It provides the 9 main atmospheric target classifications that can be distinguished by radar and lidar.\n", "The classes are defined in the definition and long_definition attributes." ; target_classification:plot_range = 0b, 10b ; target_classification:definition = "0: Clear sky\n", "1: Cloud droplets only\n", "2: Drizzle or rain\n", "3: Drizzle/rain & cloud droplets\n", "4: Ice\n", "5: Ice & supercooled droplets\n", "6: Melting ice\n", "7: Melting ice & cloud droplets\n", "8: Aerosol\n", "9: Insects\n", "10: Aerosol & insects" ; target_classification:long_definition = "0: Clear sky\n", "1: Cloud liquid droplets only\n", "2: Drizzle or rain\n", "3: Drizzle or rain coexisting with cloud liquid droplets\n", "4: Ice particles\n", "5: Ice coexisting with supercooled liquid droplets\n", "6: Melting ice particles\n", "7: Melting ice particles coexisting with cloud liquid droplets\n", "8: Aerosol particles, no cloud or precipitation \n", "9: Insects, no cloud or precipitation\n", "10: Aerosol coexisting with insects, no cloud or precipitation" ; target_classification:legend_key_red = 1.f, 0.4f, 1.f, 0.f, 1.f, 0.f, 1.f, 0.f, 0.8f, 0.6f, 0.4f ; target_classification:legend_key_green = 1.f, 0.8f, 0.f, 0.f, 0.9f, 0.8f, 0.6f, 0.6f, 0.8f, 0.6f, 0.4f ; target_classification:legend_key_blue = 1.f, 1.f, 0.f, 1.f, 0.f, 0.f, 0.f, 0.6f, 0.8f, 0.6f, 0.4f ; byte detection_status(time, height) ; detection_status:long_name = "Radar and lidar detection status" ; detection_status:comment = "This variable is a simplification of the bitfield \"quality_bits\" in the target categorization and data quality dataset.\n", "It reports on the reliability of the radar and lidar data used to perform the classification.\n", "The classes are defined in the definition and long_definition attributes." ; detection_status:plot_range = 0b, 9b ; detection_status:definition = "0: Clear sky\n", "1: Lidar echo only\n", "2: Radar echo but uncorrected atten.\n", "3: Good radar & lidar echos\n", "4: No radar but unknown attenuation\n", "5: Good radar echo only\n", "6: No radar but known attenuation\n", "7: Radar corrected for liquid atten.\n", "8: Radar ground clutter\n", "9: Lidar molecular scattering" ; detection_status:long_definition = "0: Clear sky\n", "1: Lidar echo only\n", "2: Radar echo but reflectivity may be unreliable as attenuation by rain, melting ice or liquid cloud has not been corrected\n", "3: Good radar and lidar echos\n", "4: No radar echo but rain or liquid cloud beneath mean that attenuation that would be experienced is unknown\n", "5: Good radar echo only\n", "6: No radar echo but known attenuation\n", "7: Radar echo corrected for liquid cloud attenuation using microwave radiometer data\n", "8: Radar ground clutter\n", "9: Lidar clear-air molecular scattering" ; detection_status:legend_key_red = 1.f, 1.f, 0.4f, 0.f, 0.6f, 0.4f, 0.8f, 0.f, 1.f, 1.f ; detection_status:legend_key_green = 1.f, 0.9f, 0.4f, 0.8f, 0.6f, 0.8f, 0.8f, 0.f, 0.f, 0.6f ; detection_status:legend_key_blue = 1.f, 0.f, 0.4f, 0.f, 0.6f, 1.f, 0.8f, 1.f, 0.f, 0.f ; float cloud_base_height(time, layer) ; cloud_base_height:long_name = "Height of cloud base above ground" ; cloud_base_height:axis = "Z" ; cloud_base_height:units = "m" ; cloud_base_height:missing_value = -999.f ; cloud_base_height:comment = "This variable was calculated from the instance of cloud in the cloud mask variable and provides cloud base height for a maximum of 1 cloud layers" ; float cloud_top_height(time, layer) ; cloud_top_height:long_name = "Height of cloud top above ground" ; cloud_top_height:axis = "Z" ; cloud_top_height:units = "m" ; cloud_top_height:missing_value = -999.f ; cloud_top_height:comment = "This variable was calculated from the instance of cloud in the cloud mask variable and provides cloud base top for a maximum of 1 cloud layers" ; // global attributes: :Conventions = "CF-1.0" ; :title = "Classification products from Chilbolton" ; :location = "Chilbolton" ; :day = 12s ; :month = 10s ; :year = 2003s ; :history = "06 May 2005 19:48:00 - Generated from categorization data by Ewan O\'Connor \n", "Categorization history: 19 Jan 2005 17:38:05 - Generated from level 1 data by Ewan O\'Connor \n", "Radar history: Wed Feb 25 01:52:27 2004 - NetCDF generated from original data by Nicolas Gaussiat on hogwarts\n", "Wed May 12 10:09:33 2004 - Recalibrated (-5.5 dB) by Nicolas Gaussiat on hogwarts\n", "Wed May 12 11:32:35 2004 - Inserted incoherent reflectivity factor by radar on hogwarts\n", "(Incoherent processing history: Wed Feb 25 00:57:23 2004 - NetCDF generated from original data by Nicolas Gaussiat on hogwarts\n", "Wed May 12 10:34:34 2004 - Recalibrated (+0.5 dB) by Nicolas Gaussiat on hogwarts)\n", "Lidar history: Mon Oct 13 04:05:34 2003 - NetCDF generated from original data by Ewan O\'Connor on hogwarts\n", "Model history: Fri Sep 24 11:05:08 BST 2004 - NetCDF generated from original data by Ewan O\'Connor using cnmodel2nc on hogwarts\n", "Fri Nov 12 17:36:14 2004 - Comments added by radar on hogwarts\n", "Gauge history: Recorded using Microlink 3000 series DAQ\n", "2003-11-10 13:55:57 : converted to netCDF from FORMAT5 using Matlab 6.5.0.180913a (R13) running on GLNX86\n", "Microwave radiometer history: \n", "2005-01-13 14:36:33 : Liquid and vapour vater path produced by Nicolas Gaussiat on hagrid\n", "" ; :source = "CloudNet categorization product (software version 0.9.2) comprising:\n", "Chilbolton 94-GHz Cloud Radar (Galileo)\n", "Frequency: 94.00 GHz\n", "Antenna diameter: 0.46 m\n", "Axis separation of transmit and receive antennas: 0.66 m\n", "Peak power: 1.6 kW\n", "Pulse width: 0.5 us\n", "Pulse repetition frequency: 6250 Hz\n", "Beam width: 0.5 degrees;\n", "Chilbolton Vaisala 905-nm CT75K lidar ceilometer\n", "Wavelength: 905 nm\n", "Half-angle beam divergence: 0.75 mrad\n", "Half-angle field of view: 0.66 mrad;\n", "ECMWF Integrated Forecast System (IFS);\n", "meteorological sensors;\n", "Microwave radiometers" ; :institution = "Data processed at the Department of Meteorology, University of Reading." ; }