Hello all,
I'm using the FITGRID procedures KURVP1 and KURVP2 to detemine the points
of intersection of two closed polygons .
The polygons represent (roughly circular) wind adjusted range circles. One
calculated outbound from some point on the earth and the other inbound to
that point.
When my input original polygons get to be of a small diameter, representing
a radius of roughly 200Nm or under, the return arrays from the KURVP1
function (XP,YP) become NAN.
I'm wondering if there are double precision versions of these function so
that I can use this program for smaller polygon radii?
Thanks in advance,
John Prinos
jprinos AT unknown
CODE: (bad as it is...)
CHARACTER*80 ACNAME,COMMAND,CRCLTYPE,CNAME
CHARACTER*250 MAPFILE,CITYNAME
DOUBLE PRECISION PLAT,PLON,ANGL,PLATDIFF,PLONDIFF
DOUBLE PRECISION ANGLL,ANGLR,ANGLB,ANGLT
INTEGER NU1,NU2,IERR,IOUT,CLRINDX,ACNINDX
REAL PLATR,PLONR,PLATN,PLONN,CLAT,CLON
REAL XLV,XRV,YBV,YTV,XLW,XRW,YBW,YTW,LS
C
C Declare stuff required to do color fill.
C
PARAMETER (LAMA=12000000,NCRA=600000,NGPS=300,LRWK=2*NCRA)
C
DIMENSION IAMA(LAMA),XCRA(NCRA),YCRA(NCRA),IAAI(NGPS),IAGI(NGPS)
REAL XUN(16),YUN(16),XP(16),YP(16),TEMP(32),S(16)
REAL XU1(16),YU1(16), XU2(16),YU2(16)
C
PARAMETER (IOUT=1000)
REAL U(IOUT),XO1(IOUT),YO1(IOUT),XON(IOUT),YON(IOUT),
+ XO2(IOUT),YO2(IOUT)
C
....
CALL GETARG(1,MAPFILE)
OPEN(UNIT=10,FILE=MAPFILE,STATUS='OLD')
READ(10,*) ANGLL,ANGLR,ANGLB,ANGLT
READ(10,*) CNAME
READ(10,*) PLAT,PLON
READ(10,*) ACNAME
1 READ(10,*,END=999) COMMAND
IF(
+(COMMAND.EQ.'OB').OR.
+(COMMAND.EQ.'IB').OR.
+(COMMAND.EQ.'0W'))
+THEN
NU1 = 16
DO 21 I=1,NU1
C XU1 Latitude point of the Ith point on the range circle
C YU1 Long. point of the Ith point on the range circle
READ(10,*) XU1(I),YU1(I)
21 CONTINUE
C
C Do KURVP1 set up.
C
CALL KURVP1(NU1,XU1,YU1,XP,YP,TEMP,S,1,IERR)
IF (IERR .NE. 0) THEN
PRINT *, 'Error return from KURVP1 =',IERR
STOP
ENDIF
C
C Get interpolated points using KURV2.
C
TINC = 1.0/(IOUT-1)
DO 10 I=1,IOUT
U(I) = (I-1)*TINC
CALL KURVP2(U(I),XO1(I),YO1(I),NU1,XU1,YU1,XP,YP,S,1)
C PRINT *, 'I=',I,' U=',U(I),' X01=', XO1(I),' YO1=',YO1(I)
IF(ABS(XO1(I)-PLAT).GT.PLATDIFF) PLATDIFF = ABS(XO1(I)-PLAT)
IF(ABS(YO1(I)-PLON).GT.PLONDIFF) PLONDIFF = ABS(YO1(I)-PLON)
10 CONTINUE
ENDIF
GOTO 1
......
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