jOceans: Oceanography-specific data and model analysis tools Conversions for Lagrangian trajectories latlon2uv - Converts latitude and longitude to horizontal velocity. uv2latlon - Integrates horizontal velocity to give latitude and longitude. Manipulating Lagrangian trajectories [see also jCell] trajextract - Extracts Lagrangian trajectory segments within given region. trajunwrap - Unwraps Lagrangian trajectories from a periodic domain. trajwrap - Wraps Lagrangian trajectories to fit within a periodic domain. trajchunk - Chunks Lagrangian trajectories based on the Coriolis period. griddrifters - Average drifter velocities onto a space/time 3D grid. Idealized numerical model tools psi2fields - Velocity and other fields from the streamfunction. [with P.E. Isachsen] periodize - Returns a doubly periodic version of an input array. Lagrangian eddy identification and analysis eddyridges - Coherent eddy ridges from Lagrangian trajectories. noisedrifters - Create a noise Lagrangian dataset matching mean and variance. eddylevels - Eddy ridge significance levels using the survival function. Eulerian eddy identification and analysis inellipse - Locates points on the interior of ellipses. closedcurves - Locate and interpolate closed curves in a possibly periodic domain. curvemoments - Centroid, area, and many other moments of a closed curve. divgeom - Geometric decomposition of eddy vorticity flux divergence. eddyfit2d - Least squares fit of 2D velocity data to an eddy profile. simpleddy - Streamfunction, velocity, and vorticity for various eddy profiles. Plotting tools for mooring data hodograph - Generate hodograph plots (simple and fancy). provec - Generate progressive vector diagrams (simple and fancy). stickvect - Plots "stick vectors" for multicomponent velocity time series. Alongtrack altimetry tools trackextract - Extracts alongtrack altimetry segments within given region. Wind-driven surface currents windtrans - Ekman-like transfer-functions for the wind-driven response. NetCDF tools ncinterp - One-line interpolation from 3D lat/lon/time field in NetCDF file. Date and time monthstats - Mean month and standard deviation using circular statistics. Topography tools and data jtopo.mat - One-sixth degree global topography, from Smith and Sandwell + IBCAO. topoplot - Plot regional or global topography at one-sixth degree resolution. Low-level functions besselktilde - K-type Bessel function after factoring off exponential decay. besselitilde - I-type Bessel function after factoring off exponential growth. curveinterp - Interpolate a field or its gradient onto a set of curves. orbitbreaks - Separate orbit into passes based on turning points. topo_copyright - Copyright statement for the Smith and Sandwell topography. See also jData.