Sofar API
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Wave Spectra
The Wave Spectra API provides full spectra 7-day forecast from the Sofar Operational WaveWatch III Model.
get
https://api.sofarocean.com
/api/op-wave-spectra/:lat/:lon
Operational Wave Spectra Forecast
Example List Request
1
curl https://api.sofarocean.com/api/op-wave-spectra -H 'token: YOUR_API_TOKEN'
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Example Data File Request
Content-Type: application/octet-stream
Content-Disposition: attachment; filename="34.50_200.00_2019-12-19T12:00:00Z_data.netcdf"
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curl https://api.sofarocean.com/api/op-wave-spectra/34.5/200 -H 'token: YOUR_API_TOKEN' -J -O
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Spectral File Description
A Sofar spectral output file contains the variance density spectrum at a single grid point from the Sofar global wave model at an hourly resolution for the duration of the entire forecast. The data is stored in NetCDF format, and the variables contained in each forecast file are listed in Table 1. A detailed description of the variables is given below.
Variable Name
Shape
Type
Units
directions
( Nd , )
float
Degrees
frequencies
( Nf , )
float
Hertz
time
( Nt , )
integer
Seconds
latitude
( 1 , )
float
Decimal degrees
longitude
( 1, )
float
Decimal degrees
depth
( 1, )
float
Meters
frequency direction spectrum
( Nt , Nd , Nf )
float
Meters2/Hertz/Degree
Table 1: The shape column indicates the shape of the array containing the variable, with Nt denoting the number of entries in time, Nf the number of frequencies and Nd the number of directions.
Directions
The direction vector contains the model directions at which the spectrum is stored. The directions are stored as a single vector of Nd=36 entries. Directions are measured counterclockwise from East. Each direction is given in degrees (ranging between [0,360) ) and indicates the direction the waves are traveling in. The directional grid has a constant resolution of 10 degrees.
Frequencies
The frequency vector contains the model directions at which the spectrum is stored. The frequencies are stored as a single vector of Nf=36 entries. Frequencies are measured in Hertz. The frequencies are defined on a logarithmic grid (1.1 growth factor) with minimum frequency f=0.035 Hz and maximum frequency f=0.98 Hz.
Time
The time vector denotes the time of the spectral entries. Time is denoted in Unix Epoch time, i.e. as seconds elapsed since Jan 1, 1970 (UTC). For forecast spectra the time vector contains Nt=169 entries at hourly intervals (7 days). The first entry denoting the starting point of the forecast.
Latitude, Longitude
The latitude and longitude are denoted in decimal degrees and indicate the location of the model gridpoint the spectrum originated from.
Depth
Depth denotes the depth in meters at the location considered.
Frequency Direction Spectrum
The frequency direction spectrum contains the binned spectral density levels as a function of time, direction and frequency. Specifically, spectra are stored as a three dimensional array where the first dimension is time, the second dimension is direction and the third is frequency. Entries are stored as density values with units m2/Hz/Deg.
Last modified 1yr ago