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subroutine da_llxy_default (xlati,xloni,x,y) 2,2
!----------------------------------------------------------------------------
! Purpose: calculates the (x,y) location (dot) in the mesoscale grids
! ------- from latitudes and longitudes
!
! for global domain co-ordinates
!
! input:
! -----
! xlat: latitudes
! xlon: longitudes
!
! output:
! -----
! x: the coordinate in x (i)-direction.
! y: the coordinate in y (j)-direction.
!
!----------------------------------------------------------------------------
implicit none
real, intent(in) :: xlati, xloni
real, intent(out) :: x, y
real :: dxlon
real :: xlat, xlon
real :: xx, yy, xc, yc
real :: cell, psi0, psx, r, flp
real :: centri, centrj
real :: ratio
real :: bb
real, parameter :: conv = 180.0 / pi
if (trace_use_frequent) call da_trace_entry
("da_llxy_default")
xlon = xloni
xlat = xlati
xlat = max (xlat, -89.95)
xlat = min (xlat, +89.95)
dxlon = xlon - xlonc
if (dxlon > 180) dxlon = dxlon - 360.0
if (dxlon < -180) dxlon = dxlon + 360.0
if (map_projection == 3) then
xc = 0.0
yc = YCNTR
cell = cos(xlat/conv)/(1.0+sin(xlat/conv))
yy = -c2*alog(cell)
xx = c2*dxlon/conv
else
psi0 = (pole - phic)/conv
xc = 0.0
! calculate x,y coords. relative to pole
flp = cone_factor*dxlon/conv
psx = (pole - xlat)/conv
if (map_projection == 2) then
! Polar stereographics:
bb = 2.0*(cos(psi1/2.0)**2)
yc = -earth_radius*bb*tan(psi0/2.0)
r = -earth_radius*bb*tan(psx/2.0)
else
! Lambert conformal:
bb = -earth_radius/cone_factor*sin(psi1)
yc = bb*(tan(psi0/2.0)/tan(psi1/2.0))**cone_factor
r = bb*(tan(psx /2.0)/tan(psi1/2.0))**cone_factor
end if
if (phic < 0.0) then
xx = r*sin(flp)
yy = r*cos(flp)
else
xx = -r*sin(flp)
yy = r*cos(flp)
end if
end if
! transform (1,1) to the origin
! the location of the center in the coarse domain
centri = real (coarse_ix + 1)/2.0
centrj = real (coarse_jy + 1)/2.0
! the (x,y) coordinates in the coarse domain
x = (xx - xc)/coarse_ds + centri
y = (yy - yc)/coarse_ds + centrj
ratio = coarse_ds / dsm
! only add 0.5 so that x/y is relative to first cross points:
x = (x - start_x)*ratio + 0.5
y = (y - start_y)*ratio + 0.5
if (trace_use_frequent) call da_trace_exit("da_llxy_default")
end subroutine da_llxy_default