In [1]:
import iris
In [2]:
# calculate the current speed using a EPIC NetCDF file
url = 'http://geoport.whoi.edu/thredds/dodsC/usgs/data2/emontgomery/stellwagen/CF-1.6/RCNWR/9541aqd-cal.nc'
In [3]:
u = iris.load_cube(url,'eastward_sea_water_velocity')
v = iris.load_cube(url,'northward_sea_water_velocity')
In [4]:
print u
eastward_sea_water_velocity / (m/s) (time: 17425; height: 8)
Dimension coordinates:
time x -
height - x
Scalar coordinates:
latitude: 43.2737388611 degrees
longitude: -70.5867462158 degrees
Attributes:
AQDAnalogInput1: NONE
AQDAnalogInput2: NONE
AQDAnalogInputCal1: [-1471. 8826.]
AQDAnalogInputCal2: [-1471. 8826.]
AQDAnalogPowerLevel: LOW
AQDAnalogPowerOutput: BATTERY
AQDAverageInterval: 120.0
AQDBeamAngle: 25.0
AQDBeamPattern: convex
AQDBeamWidth: 3.4
AQDBlankingDistance: 0.4
AQDCellSize: 50.0
AQDCompassUpdateRate: 600.0
AQDCoordinateSystem: BEAM
AQDDeploymentName: 954aqd
AQDDeploymentTime: 3/27/2013
AQDFirmwareVersion: 3.38
AQDFrequency: 1000.0
AQDHeadRotation: horizontal
AQDHeadSerialNumber: ASP 3795
AQDMeasurementLoad: 75.0
AQDNumberOfBeams: 3.0
AQDNumberOfCells: 8.0
AQDNumberOfPingsPerBurst: 6.0
AQDPressRange: [ 0. 100.]
AQDPressureCal: [ 0. 0. 3753. 12332.]
AQDProfileInterval: 600.0
AQDRecorderSize: 361 MByte
AQDSalinity: 30.0 ppt
AQDSerial_Number: AQD 5379
AQDSoftwareVersion: 1.35
AQDSoundSpeed: MEASURED
AQDSyncOutDelay: 0 sec
AQDSyncPowerDelay: 0 sec
AQDTempRange: [ -4. 40.]
AQDTransMatrix: [ 1.5774 0. 0.3677 -0.7891 -1.3662 0.3677 -0.7891 1.3662 0.36...
AQDTransmitPulseLength: 0.50 m
AQDVelRange: 1000.0
COMPOSITE: 0.0
COORD_SYSTEM: GEOGRAPHIC
ClockError: 0.0
Conventions: CF-1.6
DATA_CMNT: early termination on 7/26 due to instrument failure
DATA_ORIGIN: USGS WHSC Sed Trans Group
DATA_SUBTYPE: MOORED
DELTA_T: 600
DEPTH_CONST: 0.0
DESCRIPTION: Under Bourne Ave. Bridge
DODS.dimName: feature_type_instance
DODS.strlen: 11
DODS_EXTRA.Unlimited_Dimension: time
DRIFTER: 0.0
Deployment_date: 27-Mar-2013
EXPERIMENT: Rachel Carson National Wildlife Refuge 2013
FORTRAN_format:
INST_TYPE: Nortek Aquadopp Profiler
LatLonDatum: NAD83
MOORING: 954
POS_CONST: 0.0
PROJECT: USGS Coastal Marine Geology Program
Recovery_date: 9-Dec-2013
SciPi: N. Ganju
WATER_DEPTH: 2.82962687162
WATER_DEPTH_NOTE: (meters), nominal depth
WATER_DEPTH_datum: MSL
WATER_DEPTH_source: Water depth determined by mean pressure value
WATER_MASS: ?
WaveMeasurements: DISABLED
_ChunkSize: [1000 8]
actual_max: 168.253
actual_min: -63.2215
beam_angle: 25.0
beam_pattern: convex
beam_width: 3.4
bin_count: 8.0
bin_size: 0.5
blanking_distance: 0.4
center_first_bin: 0.9
contributor_name: N. Ganju
contributor_role: principalInvestigator
creator_email: rsignell@usgs.gov
creator_name: Rich Signell
creator_phone: +1 (508) 548-8700
creator_url: http://www.usgs.gov
date_created: 2015-08-12T20:39:00Z
epic_code: 1205
featureType: timeSeriesProfile
feneric_name: u
fileRoot: 9541aqdoldnc
fixgaps: 1.0
frequency: 1000.0
geospatial_lat_max: 43.2737
geospatial_lat_min: 43.2737
geospatial_lon_max: -70.5867
geospatial_lon_min: -70.5867
geospatial_vertical_max: 1.34037312838
geospatial_vertical_min: -2.15962687162
geospatial_vertical_positive: up
geospatial_vertical_resolution: 0.5 0.5 0.5 0.5 0.5 0.5 0.5
height_depth_units: m
history: Data cropped by user defined ensemble numbers;Data rotated into Earth Coordinates...
id: 9541aqd-cal
initial_instrument_height: 0.25
initial_instrument_height_note: from mooring log
initial_sensor_height: 0.25
inst_height: 0.25
institution: USGS Woods Hole Coastal and Marine Science Center
institution_url: http://woodshole.er.usgs.gov
instrument_type: Nortek Aquadopp Profiler
keywords: Oceans > Ocean Pressure > Water Pressure, Oceans > Ocean Temperature >...
keywords_vocabulary: GCMD Science Keywords
latitude: 43.27374
longitude: -70.58675
magnetic_variation: 99.0
magnetic_variation_applied: 99.0
metadatafile_author: Ellyn Montgomery, USGS CMGP
metadatafile_name: emrun954AQDprfoldnc
metadatafile_version: 0.0
name: u_1205
naming_authority: gov.usgs.cmgp
nominal_sensor_depth: 2.57962687162
nominal_sensor_depth_note: WATER_DEPTH-initial_instrument_height
orientation: UP
original_filename: 9541aqd-cal.nc
original_folder: RCNWR
platform: I-mount
platform_type: I frame bottom mount
pred_accuracy: 4.8
project: Coastal and Marine Geology Program
project_summary: Oceanographic and water-quality observations made at 3 sites in the wetlands...
project_title: Rachel Carson NWR 2013
publisher_email: emontgomery@usgs.gov
publisher_name: Ellyn Montgomery
publisher_phone: +1 (508) 548-8700
publisher_url: http://www.usgs.gov
salinity_set_by_user: 30.0 ppt
salinity_set_by_user_units: ppt
sensor_depth: -2.57962687162
sensor_type: Nortek Aquadopp Profiler
serial_number: AQD 5379
source: USGS
standard_name_vocabulary: CF-1.6
start_time: 03-Mar-2013 13:31:00
stop_time: 26-July-2013 01:30:59
time_coverage_duration: P10454399S
time_coverage_end: 2013-07-26T01:30:59
time_coverage_resolution: P600S
time_coverage_start: 2013-03-27T01:31:00
title: RCNWR - 9541aqd-cal.nc
transducer_offset_from_bottom: 0.25
zeroed_pressure: Yes
In [5]:
u.name()
Out[5]:
u'eastward_sea_water_velocity'
In [6]:
def calc_speed(u, v):
"""Calculate the speed"""
speed = (u**2 + v**2)**0.5
return speed
In [9]:
spData = calc_speed(u,v)
In [10]:
print spData
unknown / (meter-second^-1) (time: 17425; height: 8)
Dimension coordinates:
time x -
height - x
Scalar coordinates:
latitude: 43.2737388611 degrees
longitude: -70.5867462158 degrees
In [8]:
Content source: rsignell-usgs/notebook
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