jSphere is a module of jLab.

  jSphere:  Tools for latitude, longitude, and spherical geometry
 
  Simple lat / lon conversions
    deg180     - Converts degrees to the range [-180,180].                        
    deg360     - Converts degrees to the range [0, 360].
    degunwrap  - Unwraps arrays given in degrees.
    jdeg2rad   - Converts degrees to radians.                                     
    jrad2deg   - Converts radians to degrees.   
 
  Distances and regions 
    inregion   - Tests whether lat/lon points lie within a specified box.         
    spheredist - Computes great circle distances on a sphere.            
 
  Earth constants and frequencies
    radearth   - The radius of the earth in kilometers.   
    corfreq    - Coriolis frequency in radians per hour.   
    tidefreq   - Frequencies of the eight major tidal components.
 
  Coordinate transformations 
    latlon2xy  - Converts latitude and longitude into local Cartesian coordinates.
    latlon2xyz - Converts latitude and longitude into 3D Cartesian coordinates.   
    xy2latlon  - Converts local Cartesian coordinates into latitude and longitude.
    xyz2latlon - Converts 3D Cartesian coordinates into latitude and longitude.   
    sphere2uvw - Converts a 3D spherical vector to a 3D Cartesian vector. 
 
  Differential operators
    spherecurl - Curl of a vector field on the surface of a sphere.               
    spherediv  - Divergence of a vector field on the surface of a sphere.         
    spheregrad - Gradient of a field on the surface of a sphere.                  
    spherelap  - Laplacian of a field on the surface of a sphere.   
 
  Interpolation
    sphereinterp  - Fast linear interpolation on the sphere from non-plaid grids.
 
  Plotting tools
    latratio   - Set plot aspect ratio for latitude / longitude plot.    
    lonshift   - Shifts longitude origin for plotting purposes.                   
    regionplot - Plots a simple box indicating a latitude / longitude region.    

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