Source:
C:\Users\bbiffard\Downloads\BenTestData\StraitofGeorgia_StraitofGeorgiaCODARSystem_IonaVION_OceanographicRadarSystem_20210603T220000.000Z_20210603T230000.000Z-VION_Radials_Clean.nc
Format:
netcdf4_classic
Global Attributes:
acknowledgement = 'Ocean Networks Canada is an initiative of the University of Victoria'
id = 'BLANK'
naming_authority = 'Ocean Networks Canada'
project = 'BLANK'
processing_level = 'Quality controlled surface current data'
time_coverage_duration = 'BLANK'
time_coverage_resolution = 'BLANK'
standard_name_vocabulary = 'BLANK'
publisher_name = 'Ocean Networks Canada'
publisher_url = 'https://data.oceannetworks.ca'
publisher_email = 'info@oceannetworks.ca'
title = 'Surface Ocean Velocity; Strait of Georgia'
institution = 'Ocean Networks Canada; University of Victoria'
creator_institution = 'Ocean Networks Canada'
creator_name = 'Ocean Networks Canada'
creator_type = 'institution'
creator_email = 'info@oceannetworks.ca'
creator_url = 'https://data.oceannetworks.ca'
date_created = 'see searchID 2038382420383822'
history = 'CODAR radial data (hourly, usually) combined into one file containing ocean surface velocity vector'
references = 'https://wiki.oceannetworks.ca/display/DP/148'
source = 'CODAR Seasonde HF-Radar ocean surface current mapping device'
Conventions = 'CF-1.7, ACDD-1.3'
Metadata_conventions = 'Unidata Dataset Discovery v1.0'
cdm_data_type = 'Grid'
geospatial_bounds = 'BLANK'
geospatial_bounds_vertical_crs = 'BLANK'
geospatial_vertical_min = 0
geospatial_vertical_max = 0
geospatial_vertical_positive = 'down'
sea_name = 'Salish Sea'
instrument = 'VATK, VCOL, VGPT, VION'
summary = 'Radial velocity data within a specified radius of each grid coordinate are combined by an unweighted least-squares method using a ONC-modified HFR_Progs (v2.1.2) MATLAB package. Duty cycle is usually hourly. A number of QC tests are applied to the total current velocity data to produce a clean (filtered) data set, building on the tests applied to the radial velocity data sets. See https://wiki.oceannetworks.ca/display/DP/148 for complete documentation. In the final product, raw and quality controlled total current velocity data and other variable data are placed on a geospatial grid with easting and northing distance to site origin as dimensions. Processing parameters and related quality control information are also provided.'
keywords = 'BLANK'
comment = 'Detailed documentation: https://wiki.oceannetworks.ca/display/DP/148'
geospatial_lat_units = 'degrees east'
geospatial_lat_min = -124.003
geospatial_lat_max = 49.4272
geospatial_lon_units = 'degrees north'
geospatial_lon_min = -124.003
geospatial_lon_max = -122.7348
time_coverage_start = '29590526T235959Z'
time_coverage_end = '29690404T000000Z'
attrbution = 'Ocean Networks Canada Data Archive, http://www.oceannetworks.ca, University of Victoria, Canada, Oceanographic Radar System data from 03-Jun-2021 22:00:00 to 03-Jun-2021 23:59:59'
processing_steps = 'Radial velocity measurements are obtained from individual radar sites via manufacturer's software and archived in Oceans 2.0 (usually hourly). Upon a user requesting data, a number of QC tests are applied to the raw data to produce a clean (filtered) data set. The test thresholds/parameters are recorded below and in the Radials. QC structure. See https://wiki.oceannetworks.ca/display/DP/148 for complete documention.
loadRDLfile loaded radial velocity measurements from ruv files, obtained from individual radar sites via manufacturer's software and archived in Oceans 2.0.
QARTOD Test 6: Syntax - a collection of tests ensuring proper formatting and existence of fields within a radial file. checkRDLsyntax.m passed all checks on the RUV file header.
QARTOD Test 7: Max Threshold (radials) - Flags radial surface current speed exceeding the maximum threshold of 150 cm/s. cleanRadialsVel.m cleaned * data points exceeding the maximum radial current speed.
QARTOD Test 8: Valid Location (radials) - Flags radial surface current velocities placed over land or other invalid measurement areas. cleanRadialsLoc.m cleaned * data points with a VectorFlag value of 128.
Additional test: Temporal Quality - Flags radial surface current velocities with Radials.Error/temporalQuality (EMTP or STDV in the raw data) equal to a value of 999. cleanRadialsTemp.m cleaned * data points.
Additional test: Spatial Quality - Flags radial surface current velocities with Radials.spatialQuality (ESPT in the raw data) equal to a value of 999. cleanRadialsSpat.m cleaned * data points.
* see the relevant flag variable to determine the number of data points cleaned at each step. '
Dimensions:
time = 28
x = 93
y = 74
index = 1511
siteNameLength = 2904
Variables:
time
Size: 2x18x1
Dimensions: time
Datatype: double
Attributes:
_FillValue = -999
sdn_parameter_name = 'time'
long_name = 'Time of measurement UTC'
units = 'seconds since 1970-01-01 00:00:00'
axis = 'T'
calendar = 'gregorian'
x
Size: 93x1
Dimensions: x
Datatype: double
Attributes:
long_name = 'Easting distance from the CODAR grid origin'
units = 'km'
valid_min = '-46'
valid_max = '46'
comment = 'Grid origin coordinates: 49.0675 degrees latitude, -123.3689 degrees longitude. CODAR total ocean surface current velocity grid spacing (in km): 1'
y
Size: 74x1
Dimensions: y
Datatype: double
Attributes:
long_name = 'Northing distance from the CODAR grid origin'
units = 'km'
valid_min = '-33'
valid_max = '40'
comment = 'Grid origin coordinates: 49.0675 degrees latitude, -123.3689 degrees longitude. CODAR total ocean surface current velocity grid spacing (in km): 1'
index
Size: 290x11511x1
Dimensions: index
Datatype: int32
Attributes:
long_name = 'Index of radial velocity samples'
units = '1'
lon comment = 'Dimension representing the sample number for the radial data arrays'
site_name
Size: 74x938x4
Dimensions: ytime,xsiteNameLength
Datatype: doublechar
Attributes:
sdn_parameter_name = 'longitudeplatform_name'
long_name = 'LongitudeSite name at time index'
units = 'degrees_east'
axiscomment = 'X'
Provides the siteName to distinguish the source of combined radial data at each time index'
lon
Size: 74x93
Dimensions: y,x
Datatype: double
Attributes:
sdn_parameter_name = 'longitude'
long_name = 'Longitude'
units = 'degrees_east'
axis = 'X'
valid_min = -180
valid_max = 180
reference_datum = 'geographical coordinates, WGS84 datum'
lat
Size: 74x93
Dimensions: y,x
Datatype: double
Attributes:
sdn_parameter_name = 'latitude'
long_name = 'Latitude'
units = 'degrees_north'
axis = 'Y'
valid_min = -90
valid_max = 90
reference_datum = 'geographical coordinates, WGS84 datum'
lon_sample
Size: 2x2908x1511
Dimensions: time,index
Datatype: double
Attributes:
sdn_parameter_name = 'longitude'
long_name = 'Longitude at each radial velocity sampling location'
units = 'degrees_east'
axis = 'X'
valid_min = -180
valid_max = 180
reference_datum = 'geographical coordinates, WGS84 datum'
lat_sample
Size: 2x2908x1511
Dimensions: time,index
Datatype: double
Attributes:
sdn_parameter_name = 'latitude'
long_name = 'Latitude at each radial velocity sampling location'
units = 'degrees_north'
axis = 'Y'
valid_min = -90
valid_max = 90
reference_datum = 'geographical coordinates, WGS84 datum'
u
Size: 2x2908x1511
Dimensions: time,index
Datatype: double
Attributes:
_FillValue = -999
sdn_parameter_name = 'surface_eastward_sea_water_velocity'
long_name = 'Quality controlled eastward component of ocean surface radial velocity'
units = 'cm/s'
valid_min = -150
valid_max = 150
ancillary_variable = 'quality_flag'
coordinates = 'time lon lat'
comment = 'Quality controlled eastward component of ocean surface radial velocity.'
v
Size: 2x2908x1511
Dimensions: time,index
Datatype: double
Attributes:
_FillValue = -999
sdn_parameter_name = 'surface_northward_sea_water_velocity'
long_name = 'Quality controlled northward component of ocean surface radial velocity'
units = 'cm/s'
valid_min = -150
valid_max = 150
ancillary_variable = 'quality_flag'
coordinates = 'time lon lat'
comment = 'Quality controlled northward component of ocean surface radial velocity.'
u_raw
Size: 2x2908x1511
Dimensions: time,index
Datatype: double
Attributes:
_FillValue = -999
sdn_parameter_name = 'surface_eastward_sea_water_velocity'
long_name = 'Eastward component of ocean surface raw radial velocity'
units = 'cm/s'
ancillary_variable = 'quality_flag'
coordinates = 'time lon lat'
comment = 'Eastward component of ocean surface raw radial velocity.'
v_raw
Size: 2x2908x1511
Dimensions: time,index
Datatype: double
Attributes:
_FillValue = -999
sdn_parameter_name = 'surface_northward_sea_water_velocity'
long_name = 'Northward component of ocean surface raw radial velocity'
units = 'cm/s'
ancillary_variable = 'quality_flag'
coordinates = 'time lon lat'
comment = 'Northward component of ocean surface raw radial velocity.'
quality_flag
Size: 2x2908x1511
Dimensions: time,index
Datatype: double
Attributes:
_FillValue = -999
sdn_parameter_name = 'quality_flag'
long_name = 'Overall quality flags for total ocean surface current velocity'
flag_meanings = 'No_quality_control_performed Good_Data Data_probably_good Data_bad_but_potentially_correctable Bad_data Insufficient_valid_data_for_reliable_down_sampling Averaged_value Interpolated_value Missing_value'
valid_min = 0
valid_max = 9
flag_values = [0 1 2 3 4 6 7 8 9]
coordinates = 'time lon lat'
comment = 'Overall quality flags for eastward and northward ocean surface current velocities. For details about quality control tests applied see processing_parameters variable. With more details on ONC's flag meanings: 0 - No quality control performed, 1 - Good. Data passes all tests, 2 - Data probably good, 3 - Data bad but potentially correctable, 4 - Bad data, 6 - Insufficient valid data for reliable down-sampling, 7 - Averaged value, 8 - Interpolated value, 9 - Missing value.'
crs
Size: 2x18x1
Dimensions: time
Datatype: int32
Attributes:
long_name = 'Coordinate Reference System'
grid_mapping_name = 'latitude_longitude'
epsg_code = 'EPSG:4326'
semi_major_axis = 6378137
inverse_flattening = 298.2572
comment = 'http://www.opengis.net/def/crs/EPSG/0/4326' |