[gradsusr] Opening IFREMER .nc file
Morwakoma Matabane
Morwakoma.Matabane at weathersa.co.za
Tue Mar 29 05:49:22 EDT 2016
Good day,
I am unable to view the IFREMER netcdf data using SDFOPEN. The ncdump -h output appears as follows:
netcdf GW_L2P_ALT_CRYO_GDR_20160113_063059_20160113_071210_075_273 {
dimensions:
time = 2366 ;
variables:
double time(time) ;
time:_FillValue = 0. ;
time:long_name = "time (seconds since 1985-01-01)" ;
time:standard_name = "time" ;
time:units = "seconds since 1985-01-01 00:00:00.0" ;
time:calendar = "gregorian" ;
double lat(time) ;
lat:_FillValue = 0. ;
lat:long_name = "latitude" ;
lat:standard_name = "latitude" ;
lat:units = "degrees_north" ;
lat:comment = "Positive latitude is North latitude, negative latitude is South latitude" ;
double lon(time) ;
lon:_FillValue = 0. ;
lon:long_name = "longitude" ;
lon:standard_name = "longitude" ;
lon:units = "degrees_east" ;
lon:comment = "East longitude relative to Greenwich meridian" ;
short swh(time) ;
swh:_FillValue = 32767s ;
swh:long_name = "Ku band corrected significant waveheight" ;
swh:standard_name = "sea_surface_wave_significant_height" ;
swh:units = "m" ;
swh:quality_flag = "swh_quality" ;
swh:scale_factor = 0.001 ;
swh:coordinates = "lon lat" ;
swh:comment = "All instrumental corrections included. Uncalibrated" ;
short swh_calibrated(time) ;
swh_calibrated:_FillValue = 32767s ;
swh_calibrated:long_name = "Ku band calibrated significant waveheight" ;
swh_calibrated:standard_name = "sea_surface_wave_significant_height" ;
swh_calibrated:units = "m" ;
swh_calibrated:calibration_formula = "1.0058*swh + -0.1057" ;
swh_calibrated:calibration_reference = "Queffeulou P & Croize-Fillon D, June 2009, Global altimeter SWH data set, IFREMER" ;
swh_calibrated:quality_flag = "swh_quality" ;
swh_calibrated:scale_factor = 0.001 ;
swh_calibrated:coordinates = "lon lat" ;
swh_calibrated:comment = "All instrumental corrections included. Calibrated" ;
byte swh_quality(time) ;
swh_quality:_FillValue = 127b ;
swh_quality:long_name = "quality of Ku band significant waveheight measurement" ;
swh_quality:flag_values = 0b, 1b, 2b ;
swh_quality:flag_meanings = "good_measurement acceptable_for_some_applications bad_measurement" ;
short swh_standard_error(time) ;
swh_standard_error:_FillValue = 32767s ;
swh_standard_error:long_name = "best estimate of significant waveheight standard error" ;
swh_standard_error:units = "m" ;
swh_standard_error:source = "GlobWave Wave Data Quality Report" ;
swh_standard_error:scale_factor = 0.001 ;
swh_standard_error:coordinates = "lon lat" ;
swh_standard_error:comment = "Standard error calculated from buoy colocations, see GlobWave Product User Guide" ;
short sigma0(time) ;
sigma0:_FillValue = 32767s ;
sigma0:long_name = "Ku band corrected backscatter coefficient" ;
sigma0:units = "dB" ;
sigma0:quality_flag = "sigma0_quality" ;
sigma0:scale_factor = 0.01 ;
sigma0:coordinates = "lon lat" ;
sigma0:comment = "All instrumental corrections included. Uncalibrated" ;
short sigma0_calibrated(time) ;
sigma0_calibrated:_FillValue = 32767s ;
sigma0_calibrated:long_name = "Ku band calibrated backscatter coefficient" ;
sigma0_calibrated:units = "dB" ;
sigma0_calibrated:calibration_formula = "N/A" ;
sigma0_calibrated:calibration_reference = "N/A" ;
sigma0_calibrated:quality_flag = "sigma0_quality" ;
sigma0_calibrated:scale_factor = 0.01 ;
sigma0_calibrated:coordinates = "lon lat" ;
sigma0_calibrated:comment = "All instrumental corrections included. Calibrated" ;
byte sigma0_quality(time) ;
sigma0_quality:_FillValue = 127b ;
sigma0_quality:long_name = "quality of Ku band backscatter coefficient" ;
sigma0_quality:flag_values = 0b, 1b, 2b ;
sigma0_quality:flag_meanings = "good_measurement acceptable_for_some_applications bad_measurement" ;
short wind_speed_alt(time) ;
wind_speed_alt:_FillValue = 32767s ;
wind_speed_alt:long_name = "altimeter wind speed" ;
wind_speed_alt:standard_name = "wind_speed" ;
wind_speed_alt:units = "m s-1" ;
wind_speed_alt:scale_factor = 0.01 ;
wind_speed_alt:coordinates = "lon lat" ;
short wind_speed_alt_calibrated(time) ;
wind_speed_alt_calibrated:_FillValue = 32767s ;
wind_speed_alt_calibrated:long_name = "calibrated altimeter wind speed" ;
wind_speed_alt_calibrated:standard_name = "wind_speed" ;
wind_speed_alt_calibrated:units = "m s-1" ;
wind_speed_alt_calibrated:calibration_formula = "N/A" ;
wind_speed_alt_calibrated:calibration_reference = "N/A" ;
wind_speed_alt_calibrated:scale_factor = 0.01 ;
wind_speed_alt_calibrated:coordinates = "lon lat" ;
short wind_speed_model_u(time) ;
wind_speed_model_u:_FillValue = 32767s ;
wind_speed_model_u:long_name = "U component of the model wind vector" ;
wind_speed_model_u:standard_name = "wind_speed" ;
wind_speed_model_u:units = "m s-1" ;
wind_speed_model_u:source = "atmospheric model" ;
wind_speed_model_u:institution = "ECMWF" ;
wind_speed_model_u:scale_factor = 0.01 ;
wind_speed_model_u:coordinates = "lon lat" ;
short wind_speed_model_v(time) ;
wind_speed_model_v:_FillValue = 32767s ;
wind_speed_model_v:long_name = "V component of the model wind vector" ;
wind_speed_model_v:standard_name = "wind_speed" ;
wind_speed_model_v:units = "m s-1" ;
wind_speed_model_v:source = "atmospheric model" ;
wind_speed_model_v:institution = "ECMWF" ;
wind_speed_model_v:scale_factor = 0.01 ;
wind_speed_model_v:coordinates = "lon lat" ;
int rejection_flags(time) ;
rejection_flags:_FillValue = 2147483647 ;
rejection_flags:long_name = "consolidated instrument and ice flags" ;
rejection_flags:flag_masks = 1, 2048, 4096, 8192, 16384, 32768, 65536, 262144, 524288, 1048576, 8388608, 16777216, 33554432, 67108864, 134217728, 1073741824, -2147483648 ;
rejection_flags:flag_meanings = "flag_rejection ice_flag quality_of_off_nadir_from_platform quality_of_off_nadir_from_waveform quality_of_C_band_sigma0 quality_of_orbit quality_of_C_band_swh quality_of_Ku_band_sigma0 quality_of_Ku_band_swh quality_of_range_estimate corruption_of_radiometer_measurement corruption_of_altimeter_measurement radiometer_land_flag altimeter_ocean_flag altimeter_land_flag attitude_status hardware_status" ;
short swh_rms(time) ;
swh_rms:_FillValue = 32767s ;
swh_rms:long_name = "RMS of the Ku band significant waveheight" ;
swh_rms:units = "m" ;
swh_rms:scale_factor = 0.001 ;
swh_rms:coordinates = "lon lat" ;
byte swh_num_valid(time) ;
swh_num_valid:_FillValue = 127b ;
swh_num_valid:long_name = "number of valid points used to compute Ku band significant waveheight" ;
swh_num_valid:units = "count" ;
swh_num_valid:valid_min = 0b ;
swh_num_valid:valid_max = 10b ;
swh_num_valid:coordinates = "lon lat" ;
short sigma0_rms(time) ;
sigma0_rms:_FillValue = 32767s ;
sigma0_rms:long_name = "RMS of the Ku band backscatter coefficient" ;
sigma0_rms:units = "dB" ;
sigma0_rms:scale_factor = 0.01 ;
sigma0_rms:coordinates = "lon lat" ;
short off_nadir_angle_pf(time) ;
off_nadir_angle_pf:_FillValue = 32767s ;
off_nadir_angle_pf:long_name = "square of the off nadir angle computed from platform data" ;
off_nadir_angle_pf:units = "degree2" ;
off_nadir_angle_pf:scale_factor = 0.0001 ;
off_nadir_angle_pf:coordinates = "lon lat" ;
off_nadir_angle_pf:add_offset = 0.0161 ;
short range_rms(time) ;
range_rms:_FillValue = 32767s ;
range_rms:long_name = "RMS of the Ku band range" ;
range_rms:units = "m" ;
range_rms:scale_factor = 0.0001 ;
range_rms:coordinates = "lon lat" ;
short bathymetry(time) ;
bathymetry:_FillValue = 32767s ;
bathymetry:long_name = "ocean depth" ;
bathymetry:units = "m" ;
bathymetry:source = "GEBCO/30s" ;
bathymetry:institution = "IOC/IHO/GSFC" ;
bathymetry:scale_factor = 1. ;
bathymetry:add_offset = 0 ;
bathymetry:coordinates = "lon lat" ;
short distance_to_coast(time) ;
distance_to_coast:_FillValue = 32767s ;
distance_to_coast:long_name = "distance to nearest coast" ;
distance_to_coast:units = "km" ;
distance_to_coast:source = "GEBCO/1min" ;
distance_to_coast:institution = "IOC/IHO/GSFC" ;
distance_to_coast:scale_factor = 1. ;
distance_to_coast:coordinates = "lon lat" ;
short sea_surface_temperature(time) ;
sea_surface_temperature:_FillValue = 32767s ;
sea_surface_temperature:long_name = "sea surface temperature" ;
sea_surface_temperature:standard_name = "sea_surface_temperature" ;
sea_surface_temperature:units = "K" ;
sea_surface_temperature:source = "atmospheric model" ;
sea_surface_temperature:institution = "ECMWF" ;
sea_surface_temperature:scale_factor = 0.01 ;
sea_surface_temperature:coordinates = "lon lat" ;
short surface_air_temperature(time) ;
surface_air_temperature:_FillValue = 32767s ;
surface_air_temperature:long_name = "surface air temperature" ;
surface_air_temperature:units = "K" ;
surface_air_temperature:source = "atmospheric model" ;
surface_air_temperature:institution = "ECMWF" ;
surface_air_temperature:scale_factor = 0.01 ;
surface_air_temperature:coordinates = "lon lat" ;
short surface_air_pressure(time) ;
surface_air_pressure:_FillValue = 32767s ;
surface_air_pressure:long_name = "surface air pressure" ;
surface_air_pressure:standard_name = "air_pressure_at_sea_level" ;
surface_air_pressure:units = "Pa" ;
surface_air_pressure:source = "atmospheric model" ;
surface_air_pressure:institution = "ECMWF" ;
surface_air_pressure:scale_factor = 1. ;
surface_air_pressure:add_offset = 75000 ;
surface_air_pressure:coordinates = "lon lat" ;
// global attributes:
:Conventions = "CF-1.4" ;
:title = "GlobWave L2P derived from CRYOSAT IGDR Product" ;
:source = "radar altimeter" ;
:project = "ESA GlobWave" ;
:institution = "GlobWave" ;
:history = "2016-01-25T14:05:12 UTC : Creation;\n",
"2016-01-26T14:41:03 UTC : ECMWF data added" ;
:contact = "SatOC e.ash at satoc.eu" ;
:references = "GlobWave Product User Guide" ;
:processing_center = "Ifremer" ;
:software_version = "SatOC GlobWave Cryosat IGDR to L2P Processor 1.3" ;
:source_provider = "NOAA" ;
:mission_name = "CRYOSAT2" ;
:source_name = "c2p0273c075.nc" ;
:source_version = "N/A" ;
:source_software = "N/A" ;
:altimeter_sensor_name = "N/A" ;
:radiometer_sensor_name = "N/A" ;
:acq_station_name = "N/A" ;
:cycle_number = "075" ;
:pass_number = "273" ;
:equator_crossing_time = "2016-01-13T06:55:46.944131 UTC" ;
:equator_crossing_longitude = 220.276208 ;
:start_date = "2016-01-13T06:30:59.123262 UTC" ;
:stop_date = "2016-01-13T07:12:10.458630 UTC" ;
}
Help highly appreciated.
Regards
Morwakoma
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Morwakoma M Matabane ( Research Scientist )
South African Weather Service 442 Rigel Avenue South Erasmusrand Pretoria 0181
Tel: +27-12-367-6234 Fax: +27-12-367-6189
E-mail: morwakoma.matabane at weathersa.co.za<mailto:morwakoma.matabane at weathersa.co.za> Website: www.weathersa.co.za<http://www.weathersa.co.za/>
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