joceans.m

JLAB is a set of Matlab functions I have written or co-written over the past fifteen years for the p

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% JOCEANS   Oceanography-specific functions
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% Date conversion 
%   yf2num     - Converts date in 'year.fraction' format to 'datenum' format.
%   num2yf     - Converts date in 'datenum' format to 'year.fraction' format.
%   mdj2num    - Converts Modified Julian Dates to 'datenum' format.
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% Latitude and longitude conversion
%   latlon2xy  - Converts latitude and longitude into Cartesian coordinates.
%   xy2latlon  - Converts Cartesian coordinates into latitude and longitude.
%   latlon2uv  - Converts latitude and logitude to velocity.
%   deg360     - Converts degrees from the range [-180,180] to [0,360].
%   deg180     - Converts degrees from the range [0,360] to [-180,180].
%   rad2deg    - Converts radians to degrees.
%   deg2rad    - Converts degrees to radians.
%   spheredist - Computes great circle distances on a sphere.
%   inregion   - Tests whether lat/lon points lie within a specified box.
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% Plotting functions
%   stickvect  - Plots "stick vectors" for multicomponent velocity time series.
%   denscont   - Density contour overlay for oceanographic T/S plots.
%   uvplot     - Plot u and v components of velocity on the same axis.
%   provec     - Generate progressive vector diagrams (simple and fancy).
%   hodograph  - Generate hodograph plots (simple and fancy).
%   timelabel  - Put month, day, or hour labels on a time axes.
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% Eddy modelling
%   rankineeddy  - Velocity and streamfunction for a Rankine vortex.
%   gaussianeddy - Velocity and streamfunction for a Gaussian vortex.
%   twolayereddy - Velocity and streamfunction for a 2-layer Rankine vortex.
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% Specialized functions
%   heatstorage  - Water column heat storage from 1-D mixing.
%   tidefreq     - Frequencies of the eight major tidal compenents.
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% Satellite altimetry
%   pf_extract - Extract alongtrack Pathfinder data from specified region.   
%   pf_params  - Load satellite parameters from Pathfinder format file.   
%   trackfill  - Despiking and filling for alongtrack satellite data.   
%   track2grid - Interpolate alongtrack satellite data onto a grid.            
%   turningpoint  - Find turning points, i.e. local extrema, in time series.
%   orbitbreaks   - Separate orbit into passes based on turning points.

% Basic satellite geometry                        
%   ze2dist    - Converts beam zenith angle into distance to surface.          
%   ze2inc     - Converts beam zenith angle into incidence angle.              
%   latlon2zeaz  - Compute zenith and azimuth angles for satellite beam.
%   zeaz2latlon  - Compute latitude and longitude viewed by satellite beam.
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% *************************************************************************
% Wave triad interaction research        --- See Lilly and Lettvin (2006)
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% Gravity-capillary wave basics  
%   om         - Dispersion relation for gravity-capillary waves.
%   kmin       - Wavenumber of minimum phase speed for gravity-capillary waves.
%   gc_params  - Parameters for gravity-capillary waves.
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% Resonant triads
%   triadres   - Solves the triad resonance condition given two waves.
%   vtriadres  - Returns resonant wave triads given a sum wavenumber.
%   isres      - Test whether input wavenumbers form a resonant triad.
%   rescoeff   - Interaction coefficients for a resonant wave triad.
%   triadevolve  - McGoldrick's evolution functions for a resonant wave triad.
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% Triad interaction functions
%   kfun       - Combined interaction functions for wave triads.
%   hfun       - Sea surface height interaction functions for wave triads.
%   dfun       - Velocity potential interaction functions for wave triads.
%   i2ss       - Convert from i=1:4 notation to (s1,s2) notation.
%   ss2i       - Convert from (s1,s2) notation to i=1:4 notation.
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% Spectra of sets of interacting discrete waves
%   dmspec     - Computes spectrum and bispectrum for discrete wave modes.
%   dmstd      - Computes standard deviation from discrete-mode formulation.
%   dmskew     - Computes skewness from discrete-mode formulation.
%   dmasym     - Computes asymmetry from discrete-mode formulation.
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%**************************************************************************
% Other / low-level
%   radearth   - The radius of the earth in kilometers. 
%   xyz2latlon - Convert Cartesian coordinates into latitude and longitude.
%   latlon2xyz - Convert latitude and longitude into Cartesian coordinates.
%   ________________________________________________________
%   This is part of JLAB --- type 'help jlab' for more information
%   (C) 2004--2006 J.M. Lilly --- type 'help jlab_license' for details        
 
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