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subroutine getheight(itime,xt,yt,zt,pt,ht)
***********************************************************************
* *
* TRAJECTORY MODEL SUBROUTINE GETHEIGHT *
* *
***********************************************************************
* *
* AUTHOR: G. WOTAWA *
* DATE: 1994-04-07 *
* Adaptation to Nesting: A. Stohl, 1999-01-07 *
* More efficient determination of wind field index, *
* A. Stohl, 2000-01-30 *
***********************************************************************
* *
* DESCRIPTION: This subroutine calculates pressure [Pa] and geometric *
* height [m] along trajectory for a given vertical *
* coordinate zt (eta ECMWF) on a given position (xt,yt). *
* *
***********************************************************************
* *
* INPUT: *
* *
* itime time relative to beginning of calculation period *
* xt x coordinate of point [grid units] *
* yt y coordinate of point [grid units] *
* zt z coordinate of point [units] *
* *
***********************************************************************
* *
* OUTPUT: *
* *
* pt pressure [Pa] *
* ht geometric height [m] *
* *
***********************************************************************
*
include 'includepar'
include 'includecom'
integer itime,indexf,j,ngrid
real pp,xt,yt,zt,pt,ht,psint,xtn,ytn
C Determine the times of the wind fields needed for interpolation
******************************************************************
if ((ldirect*memtime(1).lt.ldirect*itime).and.
+(ldirect*memtime(2).ge.ldirect*itime)) then ! between 1st and 2nd
indexf=1
else if((ldirect*memtime(2).lt.ldirect*itime).and.
+(ldirect*memtime(3).ge.ldirect*itime)) then ! between 2nd and 3rd
indexf=2
endif
C Determine which nesting level to be used
******************************************
ngrid=0
do 12 j=numbnests,1,-1
if ((xt.gt.xln(j)).and.(xt.lt.xrn(j)).and.
+ (yt.gt.yln(j)).and.(yt.lt.yrn(j))) then
ngrid=j
goto 13
endif
12 continue
13 continue
if (ngrid.eq.0) then
xtn=xt
ytn=yt
call levlininterpol(ps,nxmax,nymax,1,nx,ny,memind,
+ xt,yt,1,memtime(indexf),memtime(indexf+1),itime,indexf,psint)
else
xtn=(xt-xln(ngrid))*xresoln(ngrid)
ytn=(yt-yln(ngrid))*yresoln(ngrid)
call levlininterpoln(psn,maxnests,nxmaxn,nymaxn,1,ngrid,
+ nxn,nyn,memind,xtn,ytn,1,memtime(indexf),memtime(indexf+1),
+ itime,indexf,psint)
endif
pt=pp(psint,zt)
call zztrafo(ngrid,xtn,ytn,zt,memtime(indexf),memtime(indexf+1),
+itime,indexf,psint,ht)
return
end
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