sitive up) and orientation 

 INPUT 
   fvcom_mesh  = FVCOM 3.x grid file 
   fvcom_bath  = FVCOM 3.x bathymetry file 
   lon         = longitude of point
   lat         = latitude of point
   zeta_min    = minimum value of free surface height (m)
   zeta_max    = maximum value of free surface height (m)
   nZeta       = number of zeta partitions 
   nTheta      = number of theta partitions 
   dry_thresh  = threshold for a point to be dry
   darc        = arc spacing in meters along which fetch is searched