MODULE obs_averg_h2d
   !!======================================================================
   !!                       ***  MODULE obs_averg_h2d   ***
   !! Observation diagnostics: Perform the horizontal averaging
   !!                          from model grid to observation footprint
   !!=====================================================================

   !!----------------------------------------------------------------------
   !!   obs_averg_h2d     : Horizontal averaging to the observation footprint
   !!----------------------------------------------------------------------
   !! * Modules used
   USE par_kind, ONLY : &  ! Precision variables
      & wp
   USE phycst,   ONLY : &  ! Physical constants
      & rad,  &
      & ra,   &
      & rpi
   USE dom_oce,   ONLY : &
      & jpi, jpj, &
      & e1t, e2t, &
      & e1f, e2f, &
      & glamt, gphit, &
      & nproc
   USE in_out_manager
   USE obs_const, ONLY : &
      & obfillflt		! Fillvalue
   USE obs_utils           ! Utility functions
   USE lib_mpp,   ONLY : &
      & ctl_warn, ctl_stop, &
      & mpp_min, lk_mpp

   IMPLICIT NONE

   !! * Routine accessibility
   PRIVATE obs_avg_h2d_rad, & ! Horizontal averaging using a radial footprint
      &    obs_avg_h2d_rec, & ! Horizontal averaging using a rectangular footprint
      &    obs_deg2dist,    & ! Conversion of distance in degrees to distance in metres
      &    obs_dist2corners   ! Distance from the centre of obs footprint to the corners of a grid box
   
   PUBLIC obs_avg_h2d,      & ! Horizontal averaging to the observation footprint
      &   obs_avg_h2d_init, & ! Set up weights for the averaging
      &   obs_max_fpsize      ! Works out the maximum number of grid points required for the averaging

   !!----------------------------------------------------------------------
   !! NEMO/OPA 3.3 , NEMO Consortium (2010)
   !! $Id$
   !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
   !!----------------------------------------------------------------------

CONTAINS
 
#include "obsaverg_h2d.h90"

END MODULE obs_averg_h2d