libsim  Versione 7.1.9

◆ grid_transform_v7d_grid_compute()

subroutine grid_transform_class::grid_transform_v7d_grid_compute ( type(grid_transform), intent(in)  this,
real, dimension(:,:), intent(in)  field_in,
real, dimension(:,:,:), intent(out)  field_out,
type(vol7d_var), intent(in), optional  var,
real, dimension(:,:,:), intent(in), optional, target  coord_3d_in 
)
private

Compute the output data array from input data array according to the defined transformation.

The grid_transform object this must have been properly initialised, so that it contains all the information needed for computing the transformation. This is the sparse points-to-grid and sparse points-to-sparse points version.

Parametri
[in]thisgrid_tranform object
[in]field_ininput array
[out]field_outoutput array
[in]varphysical variable to be interpolated, if provided, some ad-hoc algorithms may be used where possible
[in]coord_3d_ininput vertical coordinate for vertical interpolation, if not provided by other means

Definizione alla linea 4207 del file grid_transform_class.F90.

4209 END FUNCTION hbilin
4210 
4211 
4212 ! Shapiro filter of order 2
4213 FUNCTION shapiro (z,zp) RESULT(zs)
4214 !! z_smoothed(i,j) = z(i,j) * (1-S) + S * sum(z_vicini)/N
4215 !! = z(i,j) - S/N (N*z(i,j) - sum(z_vicini))
4216 REAL,INTENT(in) :: z(:) ! Z values on the four surrounding points
4217 REAL,INTENT(in) :: zp ! Z values on the central point
4218 REAL :: zs ! Z smoothed value on the central point
4219 INTEGER:: N
4220 
4221 IF(c_e(zp))THEN
4222  n = count(c_e(z))
4223  zs = zp - 0.5* ( n*zp - sum(z, c_e(z)) )/n
4224 ELSE
4225  zs = rmiss
4226 END IF
4227 
4228 END FUNCTION shapiro
4229 
4230 
4231 ! Locate index of requested point
4232 SUBROUTINE basic_find_index(this, near, nx, ny, xmin, xmax, ymin, ymax, &
4233  lon, lat, extrap, index_x, index_y)
4234 TYPE(griddim_def),INTENT(in) :: this ! griddim object (from grid)
4235 logical,INTENT(in) :: near ! near or bilin interpolation (determine wich point is requested)
4236 INTEGER,INTENT(in) :: nx,ny ! dimension (to grid)
4237 DOUBLE PRECISION,INTENT(in) :: xmin, xmax, ymin, ymax ! extreme coordinate (to grid)
4238 DOUBLE PRECISION,INTENT(in) :: lon(:,:),lat(:,:) ! target coordinate
4239 LOGICAL,INTENT(in) :: extrap ! extrapolate
4240 INTEGER,INTENT(out) :: index_x(:,:),index_y(:,:) ! index of point requested
4241 
4242 INTEGER :: lnx, lny
4243 DOUBLE PRECISION :: x(SIZE(lon,1),SIZE(lon,2)),y(SIZE(lon,1),SIZE(lon,2))
4244 
4245 IF (near) THEN
4246  CALL proj(this,lon,lat,x,y)
4247  index_x = nint((x-xmin)/((xmax-xmin)/dble(nx-1)))+1
4248  index_y = nint((y-ymin)/((ymax-ymin)/dble(ny-1)))+1
4249  lnx = nx
4250  lny = ny
4251 ELSE
4252  CALL proj(this,lon,lat,x,y)
4253  index_x = floor((x-xmin)/((xmax-xmin)/dble(nx-1)))+1
4254  index_y = floor((y-ymin)/((ymax-ymin)/dble(ny-1)))+1
4255  lnx = nx-1
4256  lny = ny-1
4257 ENDIF
4258 
4259 IF (extrap) THEN ! trim indices outside grid for extrapolation
4260  index_x = max(index_x, 1)
4261  index_y = max(index_y, 1)
4262  index_x = min(index_x, lnx)
4263  index_y = min(index_y, lny)
4264 ELSE ! nullify indices outside grid
4265  WHERE(index_x < 1 .OR. index_x > lnx .OR. index_y < 1 .OR. index_y > lny)
4266  index_x = imiss
4267  index_y = imiss
4268  END WHERE
4269 ENDIF
4270 
4271 END SUBROUTINE basic_find_index
4272 
4273 END MODULE grid_transform_class
Module for defining transformations between rectangular georeferenced grids and between grids and spa...

Generated with Doxygen.