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polar_to_polar.f
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polar_to_polar.f
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c********0*********0*********0*********0*********0*********0*********
c#####################################################################
subroutine polar_to_polar(azcount,elev)
c#####################################################################
c Interpolates radar data from a Polar grid to a NEXRAD Level III
c polar grid and converts full resolution data to Nexrad Level III
c data levels.
c
c Author: Paul Harasti October 2003
c
c implicit none
c
include 'remap.inc'
c
integer*2 azcount
integer elev
integer i,j,k,m,p,pp,iaz1,iaz2,ir1,ir2,bins(np)
real x0,y0,x,y,r_factor,pi,ppidata(nrv,np),val,t1,t2,xydis
real az0,az,az1,az2,azdiff21,azdiff01,azdiff20,ms2kt
real r0,r1,rbinsize(np),range(nrv,np),rng
real temp1,temp2,daz,deltaaz,dra2,ave1,ave2,ave3,binsize
real maxval,minval
real dummy,sumazdiff,a,el_angle
real suspect_clutter(nrv),count_data(nrv),ratio_small_vr(nrv)
logical clockwise
pi=acos(-1.)
el_angle=real(the(elev))/100.
ms2kt=3.6/1.852
maxval=-2000.
minval=2000.
dummy=10.**(8.)
sumazdiff=0.
k=elev
do i=1,int(azcount*0.1)
az1=real(phi(i,k))/10.
if (az1.lt.0.) az1=az1+360.
az2=real(phi(i+1,k))/10.
if (az2.lt.0.) az2=az2+360.
if (az1.lt.10.and.az2.gt.350) az1=360.+az1
if (az2.lt.10.and.az1.gt.350) az2=360.+az2
sumazdiff=sumazdiff+(az2-az1)
enddo
if (sumazdiff.gt.0.) then
clockwise=.true.
else
clockwise=.false.
endif
do i=1,np
do j=1,nrv
ppidata(j,i)=dummy
enddo
bins(i)=bins_z(k)
rbinsize(i)=real(ref_gate_size(k))/1000.
enddo
do j=1,azcount
do i=1,bins(j)
range(i,j)=range_z(i,j,k)
c print*,range(i,j),i,j,k
if (gridref(i,j,k).eq.refmis) then
ppidata(i,j)=dummy
else
ppidata(i,j)=10.**(gridref(i,j,k)/100.)
endif
enddo
enddo
do i=1,max_r
do j=1,max_a
gridpolar(i,j)=dummy
enddo
enddo
do i=1,max_r
r0=real(i)
do j=1,max_a
az0=real(j)
if (az0.eq.360.) az0=0.
iaz2=0
do m=2,azcount
az1=real(phi(m-1,k))/10.
az2=real(phi(m,k))/10.
if (az1.lt.0.) az1=az1+360.
if (az1.ge.360.) az1=az1-360.
if (az2.lt.0.) az2=az2+360.
if (az2.ge.360.) az2=az2-360.
if (clockwise) then
if (az2.ge.az0.and.az1.le.az0) iaz2=m
if (az2.lt.10.and.az1.gt.350.) then
if (az0.lt.10.) then
if (az2.ge.az0.and.az1.le.(360.+az0)) iaz2=m
endif
if (az0.gt.350.) then
if ((360.+az2).ge.az0.and.az1.le.az0) iaz2=m
endif
endif
else
if (az1.ge.az0.and.az2.le.az0) iaz2=m
if (az1.lt.10.and.az2.gt.350.) then
if (az0.lt.10.) then
if (az1.ge.az0.and.az2.le.(360.+az0)) iaz2=m
endif
if (az0.gt.350.) then
if (az2.le.az0.and.(360.+az1).ge.az0) iaz2=m
endif
endif
endif
enddo
if (iaz2.gt.1) iaz1=iaz2-1
c
c Special case: If scan exactly spans 360 degrees,
c then need to join first and last ray in display.
c
m=1
az1=real(phi(azcount,k))/10.
az2=real(phi(m,k))/10.
if (az1.lt.0.) az1=az1+360.
if (az1.ge.360.) az1=az1-360.
if (az2.lt.0.) az2=az2+360.
if (az2.ge.360.) az2=az2-360.
if (clockwise) then
if (az2.ge.az0.and.az1.le.az0) iaz2=m
if (az2.lt.10.and.az1.gt.350.) then
if (az0.lt.10.) then
if (az2.ge.az0.and.az1.le.(360.+az0)) iaz2=m
endif
if (az0.gt.350.) then
if ((360.+az2).ge.az0.and.az1.le.az0) iaz2=m
endif
endif
else
if (az1.ge.az0.and.az2.le.az0) iaz2=m
if (az1.lt.10.and.az2.gt.350.) then
if (az0.lt.10.) then
if (az1.ge.az0.and.az2.le.(360.+az0)) iaz2=m
endif
if (az0.gt.350.) then
if (az2.le.az0.and.(360.+az1).ge.az0) iaz2=m
endif
endif
endif
if (iaz2.eq.1) iaz1=azcount
c
c end of special case.
c
if (iaz2.eq.0) goto 10
az1=real(phi(iaz1,k))/10.
if (az1.lt.0.) az1=az1+360.
az2=real(phi(iaz2,k))/10.
if (az2.lt.0.) az2=az2+360.
azdiff21=abs(az2-az1)
if (azdiff21.gt.350.) then
if (az1.lt.10.and.az2.gt.350) azdiff21=360.+az1-az2
if (az2.lt.10.and.az1.gt.350) azdiff21=360.+az2-az1
endif
if (azdiff21.lt.180..and.azdiff21.gt.4.0) goto 10
azdiff01=abs(az0-az1)
if (az0.lt.10.and.az1.gt.350) azdiff01=360.+az0-az1
if (az1.lt.10.and.az0.gt.350) azdiff01=360.+az1-az0
azdiff20=abs(az2-az0)
if (az0.lt.10.and.az2.gt.350) azdiff20=360.+az0-az2
if (az2.lt.10.and.az0.gt.350) azdiff20=360.+az2-az0
daz=azdiff01
deltaaz=azdiff01+azdiff20
rng=range(bins(iaz1),iaz1)
if (r0.gt.rng) goto 10
rng=range(bins(iaz2),iaz2)
if (r0.gt.rng) goto 10
if (bins(iaz1).ne.bins(iaz2)) then
if (rbinsize(iaz1).ne.rbinsize(iaz2)) goto 10
rng=range(bins(iaz1),iaz1)
if (rng.lt.(r0+rbinsize(iaz1))) goto 10
rng=range(bins(iaz2),iaz2)
if (rng.lt.(r0+rbinsize(iaz2))) goto 10
endif
if (azdiff21.gt.4..or.azdiff01.gt.4..or.azdiff20.gt.4.)
+print*,"here",azdiff21,azdiff01,azdiff20
ir1=0
ir2=0
do m=1,bins(iaz1)
rng=range(m,iaz1)
if (rng.lt.r0) ir1=m
if (ir1.gt.0) ir2=ir1+1
enddo
if (ir2.eq.0) goto 10
r1=range(ir1,iaz1)
if (ir2.eq.1) then
c average across azimuth on gate ngate+1 and elev nh
temp1=ppidata(ir2,iaz1)
temp2=ppidata(ir2,iaz2)
call ave(temp1,temp2,daz,deltaaz,ave2,dummy)
gridpolar(i,j)=ave2
endif
if (ir2.gt.bins(iaz1).and.ir1.eq.bins(iaz1)) then
c average across azimuth on gate ngate and elev nh
temp1=ppidata(ir1,iaz1)
temp2=ppidata(ir1,iaz2)
call ave(temp1,temp2,daz,deltaaz,ave1,dummy)
gridpolar(i,j)=ave1
endif
if (ir1.gt.0.and.ir2.le.bins(iaz1)) then
dra2=r0-r1
c average across azimuth on gate ngate and elev nh
temp1=ppidata(ir1,iaz1)
temp2=ppidata(ir1,iaz2)
call ave(temp1,temp2,daz,deltaaz,ave1,dummy)
c average across azimuth on gate ngate+1 and elev nh
temp1=ppidata(ir2,iaz1)
temp2=ppidata(ir2,iaz2)
call ave(temp1,temp2,daz,deltaaz,ave2,dummy)
c average across range
binsize=rbinsize(iaz1)
call ave(ave1,ave2,dra2,binsize,ave3,dummy)
c assign value to the grid
gridpolar(i,j)=ave3
endif
val=gridpolar(i,j)
if (val.ne.dummy.and.val.gt.maxval) maxval=real(gridpolar(i,j))
if (val.ne.dummy.and.val.lt.minval) minval=real(gridpolar(i,j))
10 continue
enddo
enddo
print*,""
print*,"PPI Tilt Number = ", k
print*,"Elevation Angle (degrees) = ",el_angle
if (maxval.ne.-2000.) then
print*,"Maximum Reflectivity (dbZ) = ",10.*alog10(maxval)
else
print*,"Maximum Reflectivity = ","no data"
endif
if (minval.ne.2000.) then
print*,"Minimum Reflectivity (dBZ) = ",10.*alog10(minval)
else
print*,"Minimum Reflectivity = ","no data"
endif
RETURN
END