program geoip cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c c g e o i p c c program for interpolating values from a grid using bilinear or c spline interpolation. the grid or the prediction points may be c in either geographical or utm coordinates. the spline prediction c is performed in a window of size 'nsp' x 'nsp' points around the c wanted points, with typical value of nsp being 8 for a good c interpolation. c c the grid file must be in standard format, i.e. scanned in e-w bands c from n to s, initiated by a label (lat1,lat2,lon1,lon2,dlat,dlon). c for utm grid northing and easting replaces lat and lon, and additio- c nally ellipsoid number (1: wgs84, 2:ed50, 3:nad27) and utm zone c must be given in label. if utm zone 99 is specified, this signals c the swedish national projection rt39 (only an approximative c transformation is currently implemented, only for geoid use etc.) c the program may interpolate from one utm zone to another. c c the grid file may be in direct access binary format, as produced c by program 'gbin'. the use of direct access format speeds up access c time. the program recognizes binary files by a special code (777) c written in the first record. c c the program attempts to interpolate all points with a distance c 'rmin' or more from the margins (for fft applications, e.g., points c near the margin are often useless). the program may interpolate in c very big grid files, but assumes the prediction points to be reaso- c nably close, reading in the smallest necessary subgrid to perform c the wanted interpolations. c c special options: c - the program may interpolate in t w o grids in the same file. this c option is especially designed for deflections of the vertical. the c two grids must have identical labels. two grid interpolation is c signalled by negative mode or mode > 100, see below. two-grid inter- c polation can only be done for grid files in txt format. c - two grids representing data in different elevations may be used c to interpolate values at some elevation between the two grids. in this c case mode = mode+100 must be specified. c - the program may also be used to convert a list of terrain corrections c into rtm-effects through a bouguer reduction to the interpolated c reference level. this approximation is only valid for long-wavelength c reference grids. stations at sea (negative heights) will have height c set to zero. c - in bilinear interpolation mode the grid file may contain 9999-values c (signals unknown), interpolated values are assigned to 9999 if any c unknown values are encountered in the closest 4 points. c For grid interpolation the wanted grid may be to large (9999's will be c written at unknown values) c c input: c c gridfile, c outputfile, c mode, nsp, rmin, lsel c (lat1,lat2,lon1,lon2 - for lsel true) c (pointfile - for mode 1 - 3 and modes > 10) c (idno - for modes 11-14,19-22 etc.) c (lint,lat1,lat2,lon1,lon2,dlat,dlon - for mode 4 only) c (iell,izone - for utm only) c (h1,h2 - for modes > 100 only) c c where c c mode ... 1: prediction point list in geographic coordinates (degrees) c 2: do, with lat and lon given in degrees, minutes, seconds c 3: prediction point list in utm coordinates c 4: predictions wanted in grid (geographic or utm) c 5: individual prediction points in lat, lon (degrees) c 6: do, with lat, lon in degrees, minutes, seconds c 7: individual prediction points in utm c c 10: like 1, with a data value in file written after predictions c 11: like 1, predictions s u b t r a c t e d from values c given in file (data value must follow after the height) c 12: do, but predictions a d d e d to values in file c 13: like 11, with a second data value for each point not changed c 14: like 12, do c 15: 'pointfile' contains a grid, from which the c interpolated values from 'gridfile' are s u b t r a c t e d, c i.e. 'outfile' = 'pointfile' - 'gridfile' c 16: 'pointfile' contains a grid, to which the c interpolated values from gridfile are a d d e d. c 17: 'pointfile' contains a grid which defines the interpolation c points. the given grid values are only used in two-height c interpolation mode (117), see below. c 18: 'pointfile' contains a grid with unknown values (9999). c the unknown values are interpolated from the gridfile, c other grid values left untouched. c 19: list of terrain corrections converted to rtm anomalies c through bouguer reduction to reference level 'gfile' c 20: list of free-air anomaly data converted to rtm-reduced c data using a bouguer plate approximation only c additional input: density c 21: conversion of free-air data to Bouguer using grid c additional input: density c 22: migration of ERS-1 data over ice caps. grid is slope c grid in degrees c c 31, 32, ..: like 11, 12, .. for utm coordinates in 'pointfile' c c - if mode is negative, mode = abs mode and t w o grid c interpolation is performed (the two grids must be in c the same file, e.g. deflections of the vertical from c program "geofour") c - if mode > 100 then point interpolation is done between c two grids in different heights using mode = mode-100. c the levels to which the two grids refer must be input. c if mode=117 then 'pointfile' is assumed c to be a height grid defining the interpolation level. c c nsp .... spline window size. nsp=0 means bilinear interpolation, c nsp=1 is equivalent to a 8x8 spline (nsp=8) c c rkm .... minimum required distance to closest edge (km) for c interpolation to take place c c lsel .. select only data wihin a subregion (lat1-lat2, lon1-lon2) c this option only works with point lists c c idno .. data number in line (statno,lat,lon,height,d(1),d(2)..) c c lint ... a logical variable specifying that output should be in c integer grid format (only needed for mode 3 and 4) c c files: c c unit10 gridfile grid file in standard format c unit20 pointfile station list file (no, lat, lon, height, ...) c unit30 outfile output file c unit31,32 scratch files for intermediate storage of all c prediction points in binary format c c ------ E X A M P L E ----- c c a typical job file, where a file 'geoidfile' containing e.g. a binary c geoid grid is used to determine values at some points in 'point- c file' through linear interpolation would look like: c c geoidfile c outputfile c 1 0 0 c pointfile c c the 'pointfile' must contain a listing of form c 1 56.000 10.000 120.0 c 2 55.894 12.029 0.0 c ..... c which gives station number, latitude and longitude in degrees, c and height in meter. The outputfile will contain the same data c followed by the interpolated value. if utm output is wanted (mode 2), c lat/lon must be replaced by northing and easting, and ellipsoid c number (1: wgs84, 2: hayford, 3: nad27, 4: bessel) and utm zone c must additionally be specified (utm zone = 99 signals swedish c national projection approximate transformation) c c ----------------------------- c c programmer: rene forsberg, danish geodetic institute. c university of calgary, mar 87. modified october 87, honefoss. c minor changes, rf thessaloniki nov 88 c revised for swedish map projection and more points, rf june 89 c modified aug 8, 1990, rf (output coordinates changed) c selection added, greenland aug 12, 1992, rf c new modes for ice etc., nov 1992, rf c allowing grid interpolation outside (with 9999's) in linear mode, dec95 c cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc implicit double precision(a-h,o-z) dimension sa(22),glab(6),glab2(6),ysp(19),rsp(19),qsp(19), .hsp(19),sai(22),dd(20) character gfile*72,ofile*72,sfile*72 logical gutm,ggeo,lsec,ltwo,lskip,lrtm,ldif,ladd,lval,lint,lfa, .utu,trutu,lchk,l2h,ligrid,l9999,l2hg,lbin,libin,lstdev,lutm,lgeo, .lgrid,lindi,lnindi,ldms,ldos,ltran,ldno,lsel,l2d,l10,l21,l22, .l2val c c dimensions: ihadim grid value arrays c igrowd max number of points in one prediction grid row c real*4 ha,grow dimension ha(15000000),grow(16000) ihadim = 15000000 igrowd = 16000 ldos = .true. c write(*,1) 1 format( .' *******************************************************', .'**************'/ .' * GEOIP - GRAVSOFT GRID INTERPOLATION - vers. DEC95 ', .'(c) RF/KMS *'/ .' *******************************************************', .'**************') write(*,2) 2 format(' input name of gridfile to be interpolated: ') read(*,101) gfile write(*,3) 3 format(' input name of outputfile: ') read(*,101) ofile 101 format(a72) call openg(10,gfile,lbin) open(30,file=ofile,form='formatted',status='unknown') c radeg = 180/3.1415926536d0 degkm = 6371.0/radeg lsec = .false. twopig = 0.1119 c write(*,10) 10 format( .' input: mode (1:pointfile deg, 2:ptfile dms,', .' 3:ptfile utm, 4:grid,'/ .' 5:lat/lon deg, 6:lat/lon dms, 7:N/E,'/ .' 11/13:dif, 12/14:sum, 15:grid dif,', .' 16:grid sum ..)'/ .' nsp (interpolation type - 0:linear, 1:spline)'/ .' rmin (minimum dist to grid edge, km) '/ .' lsel (true if subarea to be selected)') if (ldos) write(*,102) 102 format(' ') read(*,*) mode, nsp, rmin, lsel c if (lsel) then write(*,*) 'input selection area lat1,lat2,lon1,lon2: ' read(*,*) xlat1,xlat2,xlon1,xlon2 nout = 0 endif c ltwo = (mode.lt.0.or.mode.gt.100) mode = abs(mode) l2h = (mode.gt.100) if (l2h) mode = mode-100 lutm = (mode.eq.3.or.mode.eq.7.or.mode.ge.31) lgeo = (.not.lutm) if (lutm.and.mode.ge.31) mode = mode-20 ldms = (mode.eq.2.or.mode.eq.6) lval = (mode.ge.10) l2val = (lval.and.(ltwo.or.(mode.eq.13.or.mode.eq.14))) ldno = (mode.ge.10.and.mode.le.14.or.mode.ge.19) c l10 = (mode.eq.10) ldif = (mode.eq.11.or.mode.eq.13.or.mode.eq.15) ladd = (mode.eq.12.or.mode.eq.14.or.mode.eq.16) lstdev = (mode.eq.13.or.mode.eq.14) ligrid = (mode.ge.15.and.mode.le.18) l2hg = (mode.eq.17.and.l2h) l9999 = (mode.eq.18) lrtm = (mode.eq.19) lfa = (mode.eq.20) l21 = (mode.eq.21) l22 = (mode.eq.22) l2d = (l10.or.lstdev.or.l22) if (l22) then write(*,*) 'Input maximal slope allowed: ' read(*,*) slopemax endif if (lrtm.or.lfa.or.l21) then write(*,*) 'Input reduction density: ' read(*,*) dens twopig = 0.1119*dens/2.67 endif if (lval) then mode = 1 if (lutm) mode = 3 if (ligrid) mode = 4 endif lgrid = (mode.eq.4) lindi = (mode.ge.5.and.mode.le.7) lnindi = .true. if (lindi) lnindi = .false. c if (mode.lt.1.or.mode.gt.7) stop 'illegal mode' if ((lgrid.or.lrtm.or.lfa).and.l2h.and.(.not.l2hg)) .stop 'two height grid interpolation not allowed' if (ltwo.and.lbin) stop 'two grids not allowed in binary format' if (ltwo.and.(.not.l2h).and.lstdev) stop 'two grids not allowed' if (nsp.gt.19) stop 'spline window too big' if (nsp.eq.1) nsp = 8 if (nsp.eq.2.or.nsp.eq.3) nsp = 4 c c read pointfile name if required c if (mode.le.3.or.ligrid) then if (ligrid) write(*,104) if (.not.ligrid) write(*,105) 104 format(' input name of gridfile with interpolation points: ') 105 format(' input name of file with pointdata: ') read(*,101) sfile if (.not.ligrid) . open(20,file=sfile,form='formatted',status='old') if (ligrid) call openg(20,sfile,libin) endif if (ldno) then write(*,*) 'input position of data in pointfile line: ' read(*,*) idno endif c if (lnindi) open(31,form='unformatted',status='scratch') if (ltwo.and.lnindi) .open(32,form='unformatted',status='scratch') c c more input - grid specifications, utm ellipsoid and zone c if (ligrid) goto 131 if (mode.eq.4) then write(*,12) 12 format(' input grid spec: lint (f:real,t:int), ', . 'n1,n2,e1,e2,dn,de (deg or meter) ') if (ldos) write(*,102) read(*,*) lint,sfi1,sfi2,sla1,sla2,sdfi,sdla lutm = (abs(sfi1).gt.100.or.abs(sfi2).gt.100) endif if (lutm) then write(*,13) 13 format(' input: wanted ellipsoid', . ' (1:wgs84, 2:ed50, 3:nad27) and zone ') if (ldos) write(*,102) read(*,*) ielli,izonei if (ielli.lt.1.or.ielli.gt.4.or.izonei.lt.1.or.izonei.gt.99) . stop 'wanted utm ellipsoid and zone not valid' endif 131 continue c c read grid specification of possible pointfile grid c if (ligrid) then lint = .false. if (libin) then read(20,rec=1) . icode,sfi1,sfi2,sla1,sla2,sdfi,sdla,lutm,ielli,izonei if (icode.ne.777) stop 'pointfile grid lacks 777 code' else read(20,*) sfi1,sfi2,sla1,sla2,sdfi,sdla lutm = (abs(sfi1).gt.100.or.abs(sfi2).gt.100) if (lutm) read(20,*) ielli,izonei endif if (lutm.and. . (ielli.lt.1.or.ielli.gt.4.or.izonei.lt.1.or.izonei.gt.99)) . stop 'pointfile grid utm ellipsoid and zone not valid' endif c c check main grid file for geog or utm projection c if (lbin) read(10,rec=1) icode,glab,gutm,iell,izone if (.not.lbin) then read(10,*) glab gutm = (abs(glab(1)).ge.100.or.abs(glab(2)).ge.100) if (gutm) then read(10,*) iell,izone if (iell.lt.1.or.iell.gt.4.or.izone.lt.1.or.izone.gt.99) . stop 'utm specification on input grid invalid' endif endif dfi = glab(5) dla = glab(6) iinn = (glab(2)-glab(1))/glab(5) + 1.5 iine = (glab(4)-glab(3))/glab(6) + 1.5 ggeo = .true. if (gutm) ggeo = .false. ltran = (lutm.or.(lgeo.and.gutm)) c c two height grid interpolation c if (l2h) then write(*,132) 132 format(' input levels of two given grids in m: ') read(*,*) rlev1, rlev2 dlev = rlev2-rlev1 if (dlev.lt.0.001) stop 'height levels must be different' endif c c end of input - header output c ---------------------------- c write(*,140) gfile,ofile,mode,nsp,rmin 140 format(/' --- G E O I P ---', ./' grid file name: ',a36, ./' output file name: ',a36, ./,' mode = ',i1,', nsp = ',i2, .', minimum edge dist ',f5.1,' km') if (mode.lt.3.or.ligrid) write(*,141) sfile 141 format(' point file name: ',a36) if (lbin) write(*,142) 142 format(' - grid file assumed to be in binary format -') if (nsp.le.0) write(*,150) 150 format(' - bilinear interpolation -') if (nsp.gt.0) write(*,160) 160 format(' - windowed spline interpolation -') if (lfa) write(*,161) 161 format(' - rtm bouguer ', .'plate reduction of free-air data to reference level -') if (ligrid) write(*,162) 162 format(' - pointfile assumed to contain grid data -') if (lrtm) write(*,170) 170 format(' - conversion terrain corrections to rtm effects -') if (ladd) write(*,171) 171 format(' - addition of interpolated values to pointfile -') if (ldif) write(*,172) 172 format(' - subtraction of interpolated values from pointfile -') if (l2h) write(*,173) rlev1,rlev2 173 format(' - interpolation between height levels ',f8.0,' m and', .f8.0,' m') if (l9999) write(*,174) 174 format(' - unknown (9999) values interpolated from gridfile -') if (l21) write(*,175) 175 format(' - conversion of free-air data to Bouguer anomalies -') if (l22) write(*,176) 176 format(' - ERS-1 migration of altimetry over ice caps -') c c check if utm to utm transformation needed c in that case transform from izonei to geographic to izone c utu = lutm.and.gutm trutu = (utu.and.(iell.ne.ielli.or.izone.ne.izonei)) if (trutu) write(*,21) 21 format(' - utm to utm transformation required -') c if (ggeo.and.lutm.or.utu) call utmcon(ielli,izonei,sai) if (gutm.and.(.not.lutm).or.trutu) call utmcon(iell,izone,sa) c c set up list of prediction points on scratch file c entry point for individual points at 22 c ------------------------------------------------ c istat = 0 22 rfimin = 9.9e9 rlamin = rfimin rfimax = -rfimin rlamax = -rfimin res = 0.0 if (lgrid) goto 30 c c output point list or individual points wanted c n = 1 if (lindi) then if (lutm) write(*,23) 23 format(' input: N, E (meter - 0,0=exit) ') if (mode.eq.5) write(*,24) 24 format(' input: lat, lon (degrees - 0,0=exit) ') if (mode.eq.6) write(*,241) 241 format(' input: lat, lon (dms - 0,0..0=exit) ') if (ldos) write(*,102) if (mode.ne.6) then read(*,*) rfi,rla else read(*,*) ifid,ifim,rfis,ilad,ilam,rlas i = 1 if (ifid.lt.0) i = -1 rfi = i*(abs(ifid) + ifim/60.0 + rfis/3600.0) i = 1 if (ilad.lt.0) i = -1 rla = i*(abs(ilad) + ilam/60.0 + rlas/3600.0) endif if (rfi.eq.0.and.rla.eq.0) goto 92 istat = istat+1 goto 26 endif c c point list reading loop 25 if (lval) then if (lstdev.or.(l2val.and.(.not.ltwo))) then read(20,*,end=29) istat,rfi,rla,rh,(dd(j),j=1,idno),stdev if (l2val) res2 = stdev else read(20,*,end=29) istat,rfi,rla,rh,(dd(j),j=1,idno) endif if (idno.eq.0) then res = rh else res = dd(idno) endif else if (ldms) then read(20,*,end=29) istat,ifid,ifim,rfis,ilad,ilam,rlas,rh i = 1 if (ifid.lt.0) i = -1 rfi = i*(abs(ifid) + ifim/60.0 + rfis/3600.0) i = 1 if (ilad.lt.0) i = -1 rla = i*(abs(ilad) + ilam/60.0 + rlas/3600.0) else read(20,*,end=29) istat,rfi,rla,rh endif endif if (lsel) then if (rfi.lt.xlat1.or.rfi.gt.xlat2.or.rla.lt.xlon1.or.rla.gt. . xlon2) then nout = nout+1 goto 25 endif endif if (.not.lutm.and.abs(rfi).gt.100) .stop 'point list latitude value too large - use utm mode if utm' c c set ocean height to zero for rtm cases c if ((lrtm.or.lfa).and.rh.lt.0) rh = 0.0 c c transform point list to utm c 26 if (ltran) then rfio = rfi rlao = rla endif if (.not.lutm.and.gutm) then call utg(rfi/radeg,rla/radeg,rn,re,sa,.false.,.true.) rfi = rn rla = re elseif (lutm.and.ggeo) then call utg(rfi,rla,rn,re,sai,.true.,.true.) rfi = rn*radeg rla = re*radeg endif if (trutu) then call utg(rfi,rla,rfi,rla,sai,.true.,.true.) call utg(rfi,rla,rfi,rla,sa,.false.,.true.) endif c if (rfi.lt.rfimin) rfimin = rfi if (rfi.gt.rfimax) rfimax = rfi if (rla.lt.rlamin) rlamin = rla if (rla.gt.rlamax) rlamax = rla c c output prediction point list and find max and min of coordinates c if (lindi) goto 40 write(31) istat,rfi,rla,rh,res if (ltran) write(31) rfio,rlao if (lstdev) write(31) stdev if (l2val) write(31) res2 n = n+1 goto 25 29 n = n-1 goto 36 c c output points if grid format wanted c 30 inn = (sfi2-sfi1)/sdfi+1.5 ine = (sla2-sla1)/sdla+1.5 if (ine.gt.igrowd) stop 'too many rows in grid - change igrowd' n = inn*ine k = 0 c do 35 i = inn,1,-1 if (ligrid) then if (.not.libin) read(20,*) (grow(j),j=1,ine) if (libin) call inrow(20,grow,i,inn,ine) endif do 35 j = 1,ine lchk = (i.eq.1.or.i.eq.inn).and.(j.eq.1.or.j.eq.ine) res = grow(j) k = k+1 rfi = sfi1 + (i-1)*sdfi rla = sla1 + (j-1)*sdla if (.not.lutm.and.gutm) then call utg(rfi/radeg,rla/radeg,rn,re,sa, . .false.,.true.) rfi = rn rla = re elseif (lutm.and.ggeo) then call utg(rfi,rla,rn,re,sai,.true.,lchk) rfi = rn*radeg rla = re*radeg endif if (trutu) then call utg(rfi,rla,rn,re,sai,.true.,lchk) call utg(rn,re,rfi,rla,sa,.false.,lchk) endif if (rfi.lt.rfimin) rfimin = rfi if (rfi.gt.rfimax) rfimax = rfi if (rla.lt.rlamin) rlamin = rla if (rla.gt.rlamax) rlamax = rla c c output prediction grid points on scratch file c write(31) rfi,rla,res 35 continue c 36 if (ggeo) write(*,37) n,rfimin,rfimax,rlamin,rlamax 37 format(/' number of prediction points:',i8,/ .' within area ',4f10.4) if (gutm) write(*,38) n,rfimin,rfimax,rlamin,rlamax,izone 38 format(/' number of prediction points:',i8,/ .' within area ',4f10.0,' in utm zone ',i2) if (lsel) .write(*,*) 'number of points outside selection area',nout c c read in necessary heights for grid interpolation c entry point for second loop predictions at 45 c ------------------------------------------------ c 40 if (nsp.gt.0) then rnsp = float(nsp)/2-0.5 rfimin = rfimin - (rnsp+1)*dfi rfimax = rfimax + (rnsp+1)*dfi rlamin = rlamin - (rnsp+1)*dla rlamax = rlamax + (rnsp+1)*dla endif c 45 lskip = (.not.ltwo.or.lsec) if (rfimin.gt.glab(2).or.rfimax.lt.glab(1). .or.rlamin.gt.glab(4).or.rlamax.lt.glab(3)) then if (lindi) then write(*,46) 46 format(' *** point outside grid') if (.not.lbin) rewind(10) goto 91 endif stop 'prediction points completely outside grid' endif call rdelev(10,rfimin,rfimax,rlamin,rlamax,glab,gutm,iell,izone, .lbin,lskip,lnindi,rfi1,rla1,dfi,dla,nfi,nla,ha,ihadim) rfi2 = rfi1 + (nfi-1)*dfi rla2 = rla1 + (nla-1)*dla c c factors for converting gridunits to km c yfakt = 0.001 xfakt = 0.001 if (ggeo) yfakt = degkm if (ggeo) xfakt = degkm*cos((rfi2+rfi1)/2/radeg) c c station prediction loop initializations c --------------------------------------- c if (lindi.and.istat.gt.1) goto 47 np = 0 nrp99 = 0 rrmin = 9.9e9 rpmin = 9.9e9 rpmax = -9.9e9 rpsum = 0 rpsum2 = 0 nd99 = 0 dmin = 9.9e9 dmax = -9.9e9 dsum = 0 dsum2 = 0 ndd99 = 0 ddmin = 9.9e9 ddmax = -9.9e9 ddsum = 0 ddsum2 = 0 kk = 1 rh = 0.0 res = 0.0 c if (lindi) goto 47 rewind(31) if (ltwo) rewind(32) 47 continue c c prediction point loop c --------------------- c do 90 k = 1, n if (lindi) goto 48 istat = k if (lgrid) then read(31) rfi,rla,res else read(31) istat,rfi,rla,rh,res if (ltran) read(31) rfio,rlao if (lstdev) read(31) stdev if (l2val) read(31) res2 endif if (ltwo.and.lsec) read(32) res1 c if (l2val.and.lsec) res1 = res2 if (l2hg) rh = res if (l9999) rp = res if (l9999.and.int(res).ne.9999) goto 70 c c check if prediction within grid c 48 rn = (rfi-rfi1)/dfi + 1 re = (rla-rla1)/dla + 1 c c for linear int if (nsp.eq.0) then if ((rn.lt.0.499.or.rn.gt.nfi+0.501 .or. . re.lt.0.499.or.re.gt.nla+0.501).and.(.not.lgrid)) then write(*,481) k,istat,rfi,rla 481 format(' *** station',i6,' id',i9,2f13.4, . ' skipped, outside grid') goto 90 endif else c c for spline int c ii1 = ifrac(rn-rnsp+0.5) jj1 = ifrac(re-rnsp+0.5) ii2 = ii1 + nsp-1 jj2 = jj1 + nsp-1 if (ii1.lt.1.or.ii2.gt.iinn.or.jj1.lt.1.or.jj2.gt.iine) then if (lgrid) then write(*,49) rfi,rla,ii1,ii2,jj1,jj2 49 format(' fi, la = ',2f13.3,' select index = ',4i4) stop 'prediction grid too close to edge for interpolation' else write(*,50) k,istat,ii1,ii2,jj1,jj2 50 format(/' *** station',i5,' id',i9,' too close to edge -', . ' window index',4i4) endif goto 90 endif endif c c check radius to edge c rr = min((rfi-glab(1))*yfakt, (glab(2)-rfi)*yfakt, . (rla-glab(3))*xfakt, (glab(4)-rla)*xfakt) if (rmin.gt.0.and.rr.lt.rmin-0.001.and.mode.ne.4) then write(*,52) k,istat,rr 52 format(' *** station ',2i5,' too close to edge - distance ', . f6.1,' km') goto 90 endif if (rr.lt.rrmin) rrmin = rr c c bilinear interpolation c if (nsp.gt.0) goto 60 rp = bilin(rn,re,ha,nfi,nla,ihadim) goto 70 c c window spline interpolation c 60 do 65 ii = 1,nsp do 62 jj = 1,nsp ysp(jj) = ha((ii1+ii-2)*nla + jj1+jj-1) if (int(ysp(jj)).ne.9999) goto 62 write(*,601) k, istat 601 format(' *** station ',2i6,' skipped, unknown value in', . ' spline zone ***') goto 90 62 continue call initsp(ysp,nsp,rsp,qsp) hsp(ii) = spline(re-jj1+1,ysp,nsp,rsp) 65 continue call initsp(hsp,nsp,rsp,qsp) rp = spline(rn-ii1+1,hsp,nsp,rsp) c c output prediction results c 70 np = np+1 rg = rp c if (.not.lval) goto 704 if (int(rp).eq.9999) ndd99 = ndd99 + 1 if (int(rp).eq.9999) goto 701 ddsum = ddsum + rp ddsum2 = ddsum2 + rp**2 if (rp.lt.ddmin) ddmin = rp if (rp.gt.ddmax) ddmax = rp 701 if (int(res).eq.9999) nd99 = nd99 +1 if (int(res).eq.9999) goto 702 dsum = dsum + res dsum2 = dsum2 + res**2 if (res.lt.dmin) dmin = res if (res.gt.dmax) dmax = res c c difference, sum etc. of predicted quantity rg and original data res c 702 if (int(rp).eq.9999) goto 705 if (lrtm) then if (res.ge.9999) res = 0 rp = twopig*(rh-rg) - res endif if (lfa) rp = res - twopig*(rh-rg) if (l21) then if (rg.ge.0) rp = res - twopig*rg if (rg.lt.0) rp = res - twopig*1.64/2.67*rg elseif (l22) then if (rg.gt.slopemax) then rp = 9999.99 else alfa = rg/57.29578d0 rp = res - 0.5*alfa**2*802000 endif stdev = rg endif if (ldif) rp = res - rg if (ladd) rp = res + rg c correction rf nov 95 if (abs(res).ge.9999) rp = 9999 if (l10) stdev = res c 704 continue if (lsec.and.l2h) rp = (rp-res1)/dlev*(rh-rlev1)+res1 c 705 if (int(rp).eq.9999) nrp99 = nrp99+1 if (int(rp).eq.9999) goto 706 rpsum = rpsum + rp rpsum2 = rpsum2 + rp**2 if (rp.lt.rpmin) rpmin = rp if (rp.gt.rpmax) rpmax = rp c c output of point format predictions c 706 if (lgrid) goto 80 if (ltran) then rfi = rfio rla = rlao endif c if (ltwo) goto 75 if (lindi) write(*,708) rp 708 format(' interpolated value =',f10.3) if (l22) then write(30,71) istat,rfi,rla,rh,res,rp,stdev elseif (l2d) then if (lgeo) write(30,71) istat,rfi,rla,rh,rp,stdev if (lutm) write(30,72) istat,rfi,rla,rh,rp,stdev else if (lgeo) write(30,71) istat,rfi,rla,rh,rp if (lutm) write(30,72) istat,rfi,rla,rh,rp endif 71 format(' ',i16,2f13.5,f15.4,f11.3,2f9.3) 72 format(' ',i10,2f10.0,f9.2,f11.3,2f9.3) goto 90 c c two grid option c 75 if (lsec) goto 77 if (ltwo) write(32) rp goto 90 c 77 if (lindi) write(*,708) rp if (l2h) goto 78 if (lgeo) write(30,71) istat,rfi,rla,rh,res,rp if (lutm) write(30,72) istat,rfi,rla,rh,res,rp goto 90 78 if (l2d) then if (lgeo) write(30,71) istat,rfi,rla,rh,rp,stdev if (lutm) write(30,72) istat,rfi,rla,rh,rp,stdev else if (lgeo) write(30,71) istat,rfi,rla,rh,rp if (lutm) write(30,72) istat,rfi,rla,rh,rp endif goto 90 c c output of grid format predictions, store one row in grow c store first component of two-grid interpolation if needed c 80 if (.not.l2hg.or.lsec) goto 801 write(32) rp goto 90 801 grow(kk) = rp kk = kk+1 if (k.eq.1.and.mode.eq.4.and.(.not.lutm)) . write(30,81) sfi1,sfi1+(inn-1)*sdfi, . sla1,sla1+(ine-1)*sdla,sdfi,sdla 81 format(' ',4f12.6,2f12.7) if (k.eq.1.and.mode.eq.4.and.lutm) . write(30,82) sfi1,sfi1+(inn-1)*sdfi, . sla1,sla1+(ine-1)*sdla,sdfi,sdla,ielli,izonei 82 format(' ',6f11.1,/,2i5) if (kk.le.ine) goto 90 kk = 1 if (.not.lint) write(30,83) (grow(j),j=1,ine) 83 format(/,40(' ',7f10.3,/)) if (lint) write(30,84) (nint(grow(j)),j=1,ine) 84 format(/,40(' ',12i6,/)) c 90 continue 91 if (lindi) then if (.not.lbin) rewind(10) if (.not.lbin) read(10,*) glab if (.not.lbin.and.gutm) read(10,*) iell,izone goto 22 endif c c statistics for predicted data c 92 if (np.eq.0) stop 'no prediction points left' sdev = 0.0 k = np-nrp99 if (k.gt.1) sdev = sqrt((rpsum2 - rpsum**2/k)/(k-1)) if (k.gt.0) rpsum = rpsum/k if (.not.lval) goto 94 ddev = 0.0 k = np-nd99 if (k.gt.1) ddev = sqrt((dsum2 - dsum**2/k)/(k-1)) if (k.gt.0) dsum = dsum/k dddev = 0.0 k = np-ndd99 if (k.gt.1.and.lval) dddev = sqrt((ddsum2-ddsum**2/k)/(k-1)) if (k.gt.0.and.lval) ddsum = ddsum/k c 94 if (lindi) n = istat write(*,95) np,n-np,rrmin 95 format(/,' points predicted:',i7,', skipped points:',i7, ./,' minimum distance to grid edges for predictions: ',f6.1,' km', ./,' statistics: mean std.dev. min ', .' max unknown') if (lval) write(*,951) dsum,ddev,dmin,dmax,nd99 951 format(' original data (pointfile) :',4f9.3,i8) if (lval) write(*,953) ddsum,dddev,ddmin,ddmax,ndd99 953 format(' grid interpolation results:',4f9.3,i8) write(*,952) rpsum,sdev,rpmin,rpmax,nrp99 952 format(' predicted values output :',4f9.3,i8) c c read and check label for possible second loop c if (.not.ltwo.or.lsec) goto 99 write(*,96) 96 format(/' --- second grid prediction ---') lsec = .true. read(10,*) glab2 if (glab(1).ne.glab2(1).or.glab(2).ne.glab2(2). .or.glab(3).ne.glab2(3).or.glab(4).ne.glab2(4). .or.glab(5).ne.glab2(5).or.glab(6).ne.glab2(6)) .stop 'label on second grid not identical to first' if (ggeo) goto 45 read(10,*) iell2,izone2 if (iell2.ne.iell.or.izone2.ne.izone) .stop 'second grid ellipsoid/zone spec not identical to first' goto 45 c 99 close(30) write(*,991) 991 format(' ') end cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c c r d e l e v c c subroutine for reading a digital elevation file, to produce a c subgrid of elevations, covering a given area. the grid may be c in binary or txt format, with a label (lat1,lat2,lon1,lon2, c dlat,dlon) describing limits of grid and spacing. if lat and c and lon are specified in meters, an utm projection is assumed, c and next label line must contain ellipsoid number and utm zone. c c parameters: c c fi1,fi2,la1,la2 (call) limits of wanted area c hlab (call) ready read grid label c lutm,iell,izone (call) utm information c lbin (call) binary format c lskip (call) skip remaining parts of grid or not c lprint (call) print information and statistics c fi1,la1,dfi,dla,nfi,nla (return) selected grid, fi1,la1 is sw-point c h (return) array values read c idim (call) dimension statement of h c c (c) rene forsberg, kms, new version dec 89, updated dec 95 c cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc subroutine rdelev(iunit,fi1,fi2,la1,la2,hlab,lutm,iell,izone, .lbin,lskip,lprint,fi0,la0,dfi,dla,nfi,nla,h,idim) c implicit double precision(a-h,o-z) logical lutm,lskip,lbin,lprint,ltxt real*4 h, hh dimension h(idim), hh(16000) dimension hlab(6) double precision la0,la1,la2 c c parameters for index coordinate system (0,0) in sw-corner c ltxt = (.not.lbin) ii = (hlab(2)-hlab(1))/hlab(5) + 1.5 jj = (hlab(4)-hlab(3))/hlab(6) + 1.5 if (lprint) write(*,1) 1 format(/' grid file information:') if (.not.lutm.and.lprint) write(*,2) (hlab(i),i=1,6),ii,jj 2 format(' gridlab: ',6f9.4,i5,i4) if (lutm.and.lprint) write(*,3) (hlab(i),i=1,6),ii,jj,iell,izone 3 format(' gridlab: ',6f9.0,i5,i4,/,' utm ellipsoid ', .i1,' zone ',i2) c hlab1 = hlab(1) hlab3 = hlab(3) dfi = hlab(5) dla = hlab(6) i0 = ifrac((fi1-hlab1)/dfi + 0.001) j0 = ifrac((la1-hlab3)/dla + 0.001) if (i0.lt.0) i0 = 0 if (j0.lt.0) j0 = 0 fi0 = dfi*i0 + hlab1 la0 = dla*j0 + hlab3 ii0 = ifrac((fi2-hlab1)/dfi + 0.999) jj0 = ifrac((la2-hlab3)/dla + 0.999) if (ii0.ge.ii) ii0 = ii-1 if (jj0.ge.jj) jj0 = jj-1 nfi = ii0-i0+1 nla = jj0-j0+1 c c check array dimension c if (nfi*nla.gt.idim) then write(*,10) nfi,nla,nfi*nla,idim 10 format(' *** grid array dimension too small - wanted:', . i4,' x ',i4,' =',i7,', declared:',i7,' ***') stop 'decrease area or increase array dimensions' endif c nfi0 = nfi + i0 jj1 = max(1, j0+1) jj2 = min(jj, j0+nla) if (jj1.gt.jj.or.jj2.lt.1) goto 50 c c read standard elevation file c if (lbin) goto 40 do 13 i = ii, 1, -1 if (i.gt.nfi0) then read(iunit,*) (hh(j),j=1,jj) else if (i.le.i0.and.lskip) goto 50 read(iunit,*) (hh(j),j=1,jj) if (i.le.i0) goto 13 k0 = (i-i0-1)*nla - j0 do 12 j = jj1, jj2 h(k0+j) = hh(j) 12 continue endif 13 continue goto 50 c c read binary file c 40 do 20 i = nfi0, i0+1, -1 call inrow(iunit,hh,i,ii,jj) k0 = (i-i0-1)*nla - j0 do 20 j = jj1, jj2 h(k0+j) = hh(j) 20 continue c c statistics of read subgrid c 50 if (.not.lprint) return nz = 0 n9999 = 0 k = 0 sum = 0.0 sum2 = 0.0 hmin = 9.9e9 hmax = -9.9e9 c do 60 j = 1, nla do 60 i = 1, nfi rh = h((i-1)*nla+j) if (int(rh).eq.9999) then n9999 = n9999+1 goto 60 endif k = k+1 if (rh.eq.0) nz = nz+1 if (rh.lt.hmin) hmin = rh if (rh.gt.hmax) hmax = rh sum = sum+rh sum2 = sum2 + rh**2 60 continue c rm = 0.0 rs = 0.0 if (k.gt.0) rm = sum/k if (k.gt.1) rs = sqrt((sum2 - sum**2/k)/(k-1)) if (.not.lutm) write(*,71) fi0,fi0+(nfi-1)*dfi,la0, .la0+(nla-1)*dla 71 format(' selected subgrid: ',6f9.4) if (lutm) write(*,74) fi0,fi0+(nfi-1)*dfi,la0, .la0+(nla-1)*dla 74 format(' selected subgrid: ',6f9.0) write(*, 72) nfi, nla, nfi*nla, nz, n9999 72 format(' points: ',i3,' x ',i3,' =',i8,', zero values:',i8, .', unknown (9999):',i8) write(*, 73) hmin, hmax, rm, rs 73 format(' min max mean std.dev.:',4f10.2) return end c integer function ifrac(r) implicit double precision(a-h,o-z) if (r.lt.0) goto 10 ifrac = r return 10 i = r if (i.eq.r) goto 20 ifrac = i-1 return 20 ifrac = i return end c subroutine openg(iunit,name,ldirac) cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c c o p e n g c c this subroutine will open a grid file to either a text or c binary direct access format file. the code '777' must be first c value in binary file, for details see 'gbin' program c 'ldirac' is true for a direct access file, false for a text file c c (c) rene forsberg, kms, dec 89 c cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc logical ldirac character*72 name ldirac = .true. open(unit=iunit,file=name,status='old', .form='unformatted',access='direct',recl=64,err=10) read(iunit,rec=1,err=11) icode if (icode.eq.777) return 11 close(iunit) 10 ldirac = .false. open(unit=iunit,file=name,status='old',form='formatted') return end c subroutine inrow(iunit,grow,i,nn,ne) ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c c i n r o w c c reads one row of the grid in binary direct access format. the row c records are starting from the north. 'iunit' must be opened with c a record length equal to 16 reals c c (c) rf dec 89 c ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc real*4 grow(*) jrec = (ne-1)/16 irec = (nn-i)*(jrec+1)+2 do 10 j = 0, jrec 10 read(iunit,rec=(irec+j)) (grow(j*16+k),k=1,16) return end c subroutine outrow(iunit,grow,i,nn,ne) cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c c o u t r o w c c write records on direct access format, to be input by 'inrow' c c (c) rf dec 89 c ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc real*4 grow(*) jrec = (ne-1)/16 irec = (nn-i)*(jrec+1)+2 do 10 j = 0, jrec 10 write(iunit,rec=(irec+j)) (grow(j*16+k),k=1,16) return end cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c c c b i l i n c c c c interpolates values in an array a using bilinear c c (parabolic hyperboloid) interpolation. c c c c parameters: c c c c bilin interpolated value c c c c ri, rj interpolation argument, (1,1) in lower left corner, c c (imax, jmax) in upper right. c c c c a integer*2 array with arguments c c c c imax, jmax number of points in grid c c c c iadim declared dimension of 'a' c c c c outside area covered by 'a' the function returns c c an unknown code (9999). c if unknown (9999) values are met in file c the subroutine returns 9999. c c programmer: c rene forsberg, july 1983, modified june 1989, dec 1995 c cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c double precision function bilin(ri,rj,a,imax,jmax,iadim) implicit double precision(a-h, o-z) real*4 a dimension a(iadim) c if (ri.lt.0.499.or.ri.gt.imax+0.501.or. .rj.lt.0.499.or.rj.gt.jmax+0.501) then bilin = 9999 return endif c in = ifrac(ri) ie = ifrac(rj) rn = ri - in re = rj - ie c if (in.lt.1) then in = 1 rn = 0.0 elseif (in.ge.imax) then in = imax-1 rn = 1.0 endif if (ie.lt.1) then ie = 1 re = 0.0 elseif (ie.ge.jmax) then ie = jmax-1 re = 1.0 endif c c let possible corner value give value if close c k = (in-1)*jmax + ie a1 = a(k) a2 = a(k+jmax) a3 = a(k+1) a4 = a(k+jmax+1) if (int(a1).eq.9999.or.int(a2).eq.9999.or. .int(a3).eq.9999.or.int(a4).eq.9999) then bilin = 9999 return endif c bilin = (1-rn)*(1-re)*a1 + .rn*(1-re)*a2 + (1-rn)*re*a3 + .rn*re*a4 return end c cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c c c i n i t s p c c c c initialization procedure for fast 1-dimensional equidistant c c spline interpolation, with free boundary end conditions c c reference: josef stoer: einfuhrung in die numerische mathematik c c i, springer 1972. c c c c parameters (real): c c c c y given values, y(1), ..., y(n) c c c c r spline moments (1 ... n), to be used by function 'spline' c c c c q work-array, declared at least 1:n c c c c rene forsberg, july 1983 c c c cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c subroutine initsp(y, n, r, q) c implicit double precision(a-h,o-z) dimension y(19), r(19), q(19) c q(1) = 0.0 r(1) = 0.0 do 11 k = 2, n-1 p = q(k-1)/2+2 q(k) = -0.5/p r(k) = (3*(y(k+1)-2*y(k)+y(k-1)) - r(k-1)/2)/p 11 continue r(n) = 0.0 do 12 k = n-1, 2, -1 r(k) = q(k)*r(k+1)+r(k) 12 continue return end c cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c c c s p l i n e c c c c fast one-dimensional equidistant spline interpolation function. c c c c parameters: c c c c x interpolation argument (real), x = 1 first data-point, c c x = n last data-point. outside the range linear extra- c c polation is used. c c c c y real*8 array, 1 .. n : data values c c c c r do: spline moments calculated by subroutine 'initsp' c c c c programmer: c c rene forsberg, june 1983 c c c cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c double precision function spline(x, y, n, r) c implicit double precision (a-h, o-z) dimension y(19), r(19) c if(x.ge.1.0) go to 1 spline = y(1) + (x-1)*(y(2)-y(1)-r(2)/6) return 1 if(x.le.float(n)) go to 2 spline = y(n) + (x-n)*(y(n)-y(n-1)+r(n-1)/6) return 2 j = ifrac(x) xx = x - j spline = y(j) + . xx * ((y(j+1)-y(j)-r(j)/3-r(j+1)/6) + . xx * (r(j)/2 + . xx * (r(j+1)-r(j))/6)) return end subroutine utmcon(isys, izone, sa) implicit double precision (a-h,o-z) dimension sa(22) c cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c c u t m c o n c c the procedure produces the constants needed in the transfor- c mations between transversal mercator and geographical coordina- c tes and the tolerances needed for the check of the transfor- c mations. the transformation constants are generated from a c reg_label defining a transversal mercator system. the formulae c are taken from k|nig und weise : mathematische grundlagen der c h|heren geod sph. geo (real) c sa(8) - sa(11) = const for sph. geo -> ell. geo (real), c sa(12) - sa(15) = const for sph. n, e -> ell. n, e (real), c sa(16) - sa(19) = const for ell. n, e -> sph. n, e (real), c sa(20) = toler. for utm input, 5 mm. c sa(21) = toler. for geo input, do. c sa(22) = not used in fortran version, which operates c with n e g a t i v e northings s of equator. c the user may change sa(20) - sa(21) for special checks. c c prog: knud poder, danish geodetic institute, 7 nov 1977, c updated 18 sep 1983; c rc fortran version alp/rf oct 86, last updated apr 89 c c ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c double precision n,m radeg = 180/3.1415926536 c c set ellipsoid parameters c check for swedish special projection c if (izone.eq.99) isys = 4 goto (10,20,30,31),isys c c wgs84 ellipsoid c 10 a = 6378137.0d0 f = 1/298.2572236d0 goto 40 c c hayford ed 50 ellipsoid c 20 a = 6378388.0d0 f = 1/297.0d0 goto 40 c c clarke nad 27 ellipsoid c 30 a = 6378206.4d0 f = 1/294.9786982d0 goto 40 c c bessel ellipsoid c 31 a = 6377397.155d0 f = 1/299.153d0 c 40 eastpr = 500000.0 dm = 4.0e-4 if (izone.eq.99) dm = 0.0 if (izone.eq.99) eastpr = 1500000.0 c c normalized meridian quadrant c see k|nig und weise p.50 (96), p.19 (38b), p.5 (2) c n=f/(2.0-f) m=n**2*(1.0/4.0+n**2/64.0) w= a*(-n - dm+m*(1.0-dm))/(1.0+n) sa(1)=a + w c c central easting and longitude c sa(2)=eastpr if (izone.ne.99) sa(3)=((izone - 30)*6 - 3)/radeg if (izone.eq.99) sa(3)=15.8067/radeg c c check-tol for transformation c 5.0 mm on earth c sa(20) = 0.0050 sa(21) = sa(20)/a c c coef of trig series c c ell. geo -> sph. geo., kw p186 - 187 (51) - (52) c sa(4) = n*(-2 + n*(2.0/3.0 + n*(4.0/3.0 + n*(-82.0/45.0)))) sa(5) = n**2*(5.0/3.0 + n*(-16.0/15.0 + n*(-13.0/9.0))) sa(6) = n**3*(-26.0/15.0 + n*34.0/21.0) sa(7) = n**4*1237.0/630.0 c c sph. geo - ell. geo., kw p190 - 191 (61) - (62) c sa(8)=n*(2.0+n*(-2.0/3.0 +n*(-2.0+n*116.0/45.0))) sa(9)=n**2*(7.0/3.0+n*(-8.0/5.0+n*(-227.0/45.0))) sa(10)=n**3*(56.0/15.0+n*(-136.0)/35.0) sa(11)=n**4* (4279.0/630.0) c c sph. n, e -> ell. n, e, kw p196 (69) c sa(12)=n*(1.0/2.0+n*(-2.0/3.0+ . n*(5.0/16.0+n*41.0/180.0))) sa(13)=n**2*(13.0/48.0+ . n*(-3.0/5.0+n*557.0/1440.0)) sa(14)=n**3*(61.0/240.0+n*(-103.0/140.0)) sa(15)=n**4*(49561.0/161280.0) c c ell. n, e -> sph. n, e, kw p194 (65) c sa(16)=n*(-1.0/2.0+n*(2.0/3.0+ . n*(-37.0/96.0+n*1.0/360.0))) sa(17)=n**2*(-1.0/48.0+ . n*(-1.0/15.0+n*437.0/1440.0)) sa(18)=n**3* (-17.0/480.0+n*37.0/840.0) sa(19)=n**4*(-4397.0/161280.0) c return end c subroutine utg(rn, re, b, l, sa, direct, tcheck) implicit double precision(a-h,o-z) double precision b, l, sa(22) logical direct, tcheck c cccccccccccccccccccccccccccccccccccccccccccccccccccccccc c c u t g c c dual autochecking transformation procedure for transformation c between geographical coordinates and transversal mercator co- c ordinates. the procedure transforms utm->geo when direct is c true and the reverse when direct is false. c an alarm is produced when the check by the inverse transforma- c tion exceeds the tolerance of 5.0 mm or an other value set by c the user in sa(19) for utm->geo or sa(20) for geo->utm. c c n, e (call) real c the utm- or geographical coordinates input for trans- c formation in meters or radians. c c b, l (return) real c the geographical or utm-coordinates output from the procedure c as transformed and checked coordinates in radians or meters c c sa (call) array c transformation constants for direct and inverse transf. c see fields in sa or set_utm_const for a description c c direct (call) logical c direct = true => transformation utm -> geogr. c direct = false => transformation geogr -> utm c c tcheck (call) logical c tcheck = true => check by back transformation c tcheck = false => no check. this possibility doubles the c speed of the subroutine, with the risk of c obtaining bad results at large (> 60 deg) c distances from the central meridian. c c programmer: knud poder, dgi, nov 1977 c rcfortran alp/rf oct 86 c cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc double precision np, lg, l0, ndif, ncheck integer h, s double precision n, e c n = rn e = re qn = sa(1) e0 = sa(2) l0 = sa(3) c c transformation sequence c if (direct) i=1 if (.not.direct) i=3 h = 4-i s = 2-i c c check-values c ncheck=n echeck=e c c transformation cases c do 100 i=i,h,s goto (10,20,30),i c c case 1, utm -> geo c ------------------ c 10 np = n/qn ep = (e - e0)/qn c c ellip. n, e -> sph. n, e c np = np + clcsin(sa, 15, 4, 2.0*np, 2.0*ep, dn, de) ep = ep + de c c sph. n, e = compl. sph. lat -> sph lat, lng c cosbn = cos(np) if (cosbn.eq.0) cosbn = 1.0d-33 snh = (exp(ep) - exp(-ep))/2 lg = atan(snh/cosbn) bbg = atan(sin(np)*cos(lg)/cosbn) c c sph. lat, lng -> ell. lat, lng c bbg = bbg + clsin(sa, 7, 4, 2.0*bbg) lg = lg + l0 goto 100 c c case 2, transf results c ---------------------- c 20 b = bbg n = bbg l = lg e = lg if (tcheck) goto 100 return c c case 3, geo -> utm c ------------------ c 30 bbg = n + clsin(sa, 3, 4, 2.0*n) lg = e - l0 c c sph. lat, lng -> compl. sph. lat = sph n, e c cosbn = cos(bbg) if (cosbn.eq.0) cosbn = 1.0d-33 np = atan(sin(bbg)/(cos(lg)*cosbn)) rr = sin(lg)*cosbn if (abs(rr).ge.0.95) goto 40 ep = log((1+rr)/(1-rr))/2 goto 41 40 ep = 1.0e38 41 continue c c sph. normalized n, e -> ell. n, e c np = np + clcsin(sa, 11, 4, 2.0*np, 2.0*ep, dn, de) ep = ep + de bbg = qn*np lg = qn*ep + e0 c 100 continue c c in/rev-dif for check c ndif = bbg - ncheck edif = lg - echeck edcos = edif if(.not.direct) edcos = edcos*cos(ncheck) c c error actions c if (direct) tol = sa(20) if (.not.direct) tol = sa(21) if (abs(ndif).lt.tol.and.abs(edcos).lt.tol) return c n = rn e = re if (direct) n = b if (direct) e = l ep = 6371000.0 if (direct) ep = 1.0 write(*, 90) n*57.29578, e*57.29578, ndif*ep, edcos*ep 90 format(' *** utg coor ',2f7.1,' checkdiff too large: ', .2f8.3, ' m') return end c double precision function clsin(a, i0, g, arg) implicit double precision(a-h,o-z) dimension a(22) integer g c cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c c c l s i n c c computes the sum of a series of a(i+i0)*sin(i*arg) by clenshaw c summation from g down to 1. c the sum is the value of the function. c c prog.: knud poder 1978 c c cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c cosarg = 2*cos(arg) c hr1 = 0.0 hr = a(g+i0) c do 10 it = g - 1,1,-1 hr2 = hr1 hr1 = hr hr = -hr2 + cosarg*hr1 + a(it+i0) 10 continue c clsin = hr*sin(arg) c return end c double precision function clcsin(a, i0, g, argr, argi, r, i) implicit double precision(a-h,o-z) dimension a(22) double precision r, i integer g c ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc c c c l c s i n c c computes the sum of a series a(i+i0)*sin(i*arg_r + j*i*arg_i) c (where j is the imaginary unit) by clenshaw summation c from g down to 1. the coefficients are here real and c the argument of sin is complex. the real part of the c sum is the value of the function. c c prog.: knud poder 1978 c c ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc double precision ii c sinar = sin(argr) cosar = cos(argr) ex = exp(argi) emx = exp(-argi) sinhar = (ex - emx)/2 coshar = (ex + emx)/2 rr = 2*cosar*coshar ii = -2*sinar*sinhar c hr1 = 0.0 hi1 = 0.0 hi = 0.0 hr = a(g+i0) c do 10 it = g-1, 1, -1 hr2 = hr1 hr1 = hr hi2 = hi1 hi1 = hi hr = -hr2 + rr*hr1 - ii*hi1 + a(it+i0) hi = -hi2 + ii*hr1 + rr*hi1 10 continue c rr = sinar*coshar ii = cosar*sinhar c r = rr*hr - ii*hi clcsin = r i = rr*hi + ii*hr c return end