int inv_init(
int insys, /* input system code */
int inzone, /* input zone number */
double *inparm, /* input array of projection parameters */
int indatum, /* input datum code */
char *fn27, /* NAD 1927 parameter file */
char *fn83, /* NAD 1983 parameter file */
int *iflg, /* status flag */
int (*inv_trans[])(double, double, double*, double*))
/* inverse function pointer */
{
long zone; /* zone number */
double azimuth; /* azimuth */
double angle; /* rotation anlge */
double alf; /* SOM angle */
double lon1; /* longitude point in utm scene */
double lon2; /* 2nd longitude point */
double lat1; /* 1st standard parallel */
double lat2; /* 2nd standard parallel */
double center_long; /* center longitude */
double center_lat; /* center latitude */
double h; /* height above sphere */
double lat_origin; /* latitude at origin */
double lon_origin; /* longitude at origin */
double r_major; /* major axis in meters */
double r_minor; /* minor axis in meters */
double scale_factor; /* scale factor */
double false_easting; /* false easting in meters */
double false_northing; /* false northing in meters */
double radius; /* radius of sphere */
double shape_m; /* constant used for Oblated Equal Area */
double shape_n; /* constant used for Oblated Equal Area */
/*long start; */ /* start of SOM Beginning or end */
double time; /* SOM time */
long path; /* SOM path number */
long satnum; /* SOM satellite number */
long mode; /* which format is used A or B */
long tmpdatum; /* temporary datum for UTM */
double sat_ratio; /* satellite ratio which specify the start point*/
double dzone; /* number of longitudinal zones in ISG */
double djustify; /* justify flag in ISG projection */
long thing; /* used to initialize 8 byte pointer, added */
/* for Power Challenge */
long *iflg64; /* 8 byte status flag for Power Challenge */
thing = 0; /* These lines are to initialize the */
iflg64 = &thing; /* the 8-byte pointer address */
/* Initialize inverse transformations
-----------------------------------*/
/* find the correct major and minor axis
--------------------------------------*/
if(insys == CEA)
{
if(inparm[0] > 0.0 || inparm[0] < 0.0 ||
inparm[1] > 0.0 || inparm[1] < 0.0)
{
indatum = -20;
}
sphdz(indatum,inparm,&r_major,&r_minor,&radius);
}
else if(insys == BCEA)
{
if(inparm[0] > 0.0 || inparm[0] < 0.0 ||
inparm[1] > 0.0 || inparm[1] < 0.0)
{
indatum = -20;
}
else /* for BCEA use 6371228.0 m as default for r_maj and r_min, i.e.
use spherical earth model with radius 6371228.0 m instead of
Clarke 1866 spheroid */
{
indatum = 20;
}
sphdz(indatum,inparm,&r_major,&r_minor,&radius);
}
else
{
sphdz(indatum,inparm,&r_major,&r_minor,&radius);
}
false_easting = inparm[6];
false_northing = inparm[7];
if (insys == CEA)/* Cylindrical Equal-Area, used for EASE grid wghen
grid corners are specified in meters */
{
/* this is the call to initialize CEA
----------------------------------------*/
center_long = paksz(inparm[4],iflg64)* 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat1 = paksz(inparm[5],iflg64)* 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = ceainvint(r_major,r_minor,center_long,lat1,false_easting,
false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = ceainv;
}
else
if (insys == BCEA)/* Cylindrical Equal-Area, used for EASE grid wghen
grid corners are specified in DMS degrees */
{
/* this is the call to initialize BCEA
----------------------------------------*/
center_long = paksz(inparm[4],iflg64)* 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat1 = paksz(inparm[5],iflg64)* 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = bceainvint(r_major,r_minor,center_long,lat1,false_easting,
false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = bceainv;
}
else
if (insys == UTM)
{
/* this is the call to initialize U T M
-------------------------------------*/
/* set Clarke 1866 spheroid if negative datum code
----------------------------------------------*/
if (indatum < 0)
{
tmpdatum = 0;
sphdz(tmpdatum,inparm,&r_major,&r_minor,&radius);
}
zone = inzone;
if (zone == 0)
{
lon1 = paksz(inparm[0],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat1 = paksz(inparm[1],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
zone = calc_utm_zone(lon1 * R2D);
if (lat1 < 0)
zone = -zone;
}
scale_factor = .9996;
*iflg64 = utminvint(r_major,r_minor,scale_factor,zone);
*iflg = (int)*iflg64;
inv_trans[insys] = utminv;
}
else
if (insys == SPCS)
{
/* this is the call to initialize STATE PLANE
--------------------------------------------*/
*iflg64 = stplninvint( inzone,indatum,fn27,fn83);
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
inv_trans[insys] = stplninv;
}
else
if (insys == ALBERS)
{
/* this is the call to initialize ALBERS
---------------------------------------*/
lat1 = paksz(inparm[2],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat2 = paksz(inparm[3],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat_origin = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = alberinvint(r_major,r_minor,lat1,lat2,center_long,lat_origin,
false_easting, false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = alberinv;
}
else
if (insys == LAMCC)
{
/* this is the call to initialize LAMBERT CONFORMAL CONIC
--------------------------------------------------------*/
lat1 = paksz(inparm[2],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat2 = paksz(inparm[3],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat_origin = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = lamccinvint(r_major,r_minor,lat1,lat2,center_long,lat_origin,
false_easting, false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = lamccinv;
}
else
if (insys == MERCAT)
{
/* this is the call to initialize MERCATOR
----------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat1 = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = merinvint(r_major,r_minor,center_long,lat1,false_easting,
false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = merinv;
}
else
if (insys == PS)
{
/* this is the call to initialize POLAR STEREOGRAPHIC
----------------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat1 = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = psinvint(r_major,r_minor,center_long,lat1,false_easting,
false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = psinv;
}
else
if (insys == POLYC)
{
/* this is the call to initialize POLYCONIC
-----------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat_origin = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = polyinvint(r_major,r_minor,center_long,lat_origin,false_easting,
false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = polyinv;
}
else
if (insys == EQUIDC)
{
/* this is the call to initialize EQUIDISTANT CONIC
---------------------------------------------------*/
lat1 = paksz(inparm[2],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat2 = paksz(inparm[3],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat_origin = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
if (inparm[8] == 0)
mode = 0;
else
mode = 1;
*iflg64 = eqconinvint(r_major,r_minor,lat1,lat2,center_long,lat_origin,
false_easting,false_northing,mode);
*iflg = (int)*iflg64;
inv_trans[insys] = eqconinv;
}
else
if (insys == TM)
{
/* this is the call to initialize TRANSVERSE MERCATOR
-------------------------------------------------*/
scale_factor = inparm[2];
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat_origin = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = tminvint(r_major,r_minor,scale_factor,center_long,lat_origin,
false_easting, false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = tminv;
}
else
if (insys == STEREO)
{
/* this is the call to initialize STEREOGRAPHIC
---------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
center_lat = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = sterinvint(radius,center_long,center_lat,false_easting,
false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = sterinv;
}
else
if (insys == LAMAZ)
{
/* this is the call to initialize LAMBERT AZIMUTHAL EQUAL-AREA
-------------------------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
center_lat = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = lamazinvint(r_major, r_minor, center_long, center_lat,false_easting,
false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = lamazinv;
}
else
if (insys == AZMEQD)
{
/* this is the call to initialize AZIMUTHAL EQUIDISTANT
------------------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
center_lat = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = aziminvint(radius,center_long,center_lat,false_easting,
false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = aziminv;
}
else
if (insys == GNOMON)
{
/* this is the call to initialize GNOMONIC
----------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
center_lat = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = gnominvint(radius,center_long,center_lat,false_easting,
false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = gnominv;
}
else
if (insys == ORTHO)
{
/* this is the call to initialize ORTHOGRAPHIC
--------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
center_lat = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = orthinvint(radius,center_long,center_lat,false_easting,
false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = orthinv;
}
else
if (insys == GVNSP)
{
/* this is the call to initialize GENERAL VERTICAL NEAR SIDED PERSPECTIVE
-----------------------------------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
center_lat = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
h = inparm[2];
*iflg64 = gvnspinvint(radius,h,center_long,center_lat,false_easting,
false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = gvnspinv;
}
else
if (insys == SNSOID)
{
/* this is the call to initialize SINUSOIDAL
--------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = sininvint(radius, center_long,false_easting,false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = sininv;
}
else
if (insys == EQRECT)
{
/* this is the call to initialize EQUIRECTANGULAR
-----------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat1 = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = equiinvint(radius,center_long,lat1,false_easting,
false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = equiinv;
}
else
if (insys == MILLER)
{
/* this is the call to initialize MILLER CYLINDRICAL
--------------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = millinvint(radius, center_long,false_easting,false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = millinv;
}
else
if (insys == VGRINT)
{
/* this is the call to initialize VAN DER GRINTEN
-----------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = vandginvint(radius, center_long,false_easting,false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = vandginv;
}
else
if (insys == HOM)
{
/* this is the call to initialize HOTLINE OBLIQUE MERCATOR
---------------------------------------------------------*/
scale_factor = inparm[2];
lat_origin = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
if (inparm[12] != 0)
{
mode = 1;
azimuth = paksz(inparm[3],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lon_origin = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
}
else
{
mode = 0;
lon1 = paksz(inparm[8],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat1 = paksz(inparm[9],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lon2 = paksz(inparm[10],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lat2 = paksz(inparm[11],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
}
*iflg64 = omerinvint(r_major,r_minor,scale_factor,azimuth,lon_origin,
lat_origin,false_easting, false_northing,lon1,lat1,
lon2,lat2,mode);
*iflg = (int)*iflg64;
inv_trans[insys] = omerinv;
}
else
if (insys == SOM)
{
/* this is the call to initialize SOM
-----------------------------------*/
path = (long) inparm[3];
satnum = (long) inparm[2];
if (inparm[12] == 0)
{
mode = 1;
alf = paksz(inparm[3],iflg64) * 3600.0 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
lon1 = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
time = inparm[8];
sat_ratio = inparm[9];
/* start = (long) inparm[10];*/
}
else
mode = 0;
/*
*iflg64 = sominvint(r_major,r_minor,satnum,path,false_easting,
false_northing);
*iflg = (int)*iflg64;
*/
*iflg64 = sominvint(r_major,r_minor,satnum,path,alf,lon1,false_easting,
false_northing,time,mode,sat_ratio);
*iflg = (int)*iflg64;
inv_trans[insys] = sominv;
}
else
if (insys == HAMMER)
{
/* this is the call to initialize HAMMER
--------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = haminvint(radius, center_long,false_easting,false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = haminv;
}
else
if (insys == ROBIN)
{
/* this is the call to initialize ROBINSON
----------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = robinvint(radius, center_long,false_easting,false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = robinv;
}
else
if (insys == GOODE)
{
/* this is the call to initialize GOODE'S HOMOLOSINE
---------------------------------------------------*/
*iflg64 = goodinvint(radius);
*iflg = (int)*iflg64;
inv_trans[insys] = goodinv;
}
else
if (insys == MOLL)
{
/* this is the call to initialize MOLLWEIDE
-------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = molwinvint(radius, center_long,false_easting,false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = molwinv;
}
else
if (insys == IMOLL)
{
/* this is the call to initialize INTERRUPTED MOLLWEIDE
-----------------------------------------------------*/
*iflg64 = imolwinvint(radius);
*iflg = (int)*iflg64;
inv_trans[insys] = imolwinv;
}
else
if (insys == ALASKA)
{
/* this is the call to initialize ALASKA CONFORMAL
------------------------------------------------*/
*iflg64 = alconinvint(r_major,r_minor,false_easting,false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = alconinv;
}
else
if (insys == WAGIV)
{
/* this is the call to initialize WAGNER IV
-----------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = wivinvint(radius, center_long,false_easting,false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = wivinv;
}
else
if (insys == WAGVII)
{
/* this is the call to initialize WAGNER VII
------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = wviiinvint(radius, center_long,false_easting,false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = wviiinv;
}
else
if (insys == OBEQA)
{
/* this is the call to initialize OBLATED EQUAL AREA
---------------------------------------------------*/
center_long = paksz(inparm[4],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
center_lat = paksz(inparm[5],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
shape_m = inparm[2];
shape_n = inparm[3];
angle = paksz(inparm[8],iflg64) * 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
*iflg64 = obleqinvint(radius,center_long,center_lat,shape_m, shape_n,
angle,false_easting,false_northing);
*iflg = (int)*iflg64;
inv_trans[insys] = obleqinv;
}
else
if ((insys == ISINUS) || (insys == ISINUS1))
{
/* this is the call to initialize INTEGERIZED SINUSOIDAL GRID
------------------------------------------------------------*/
center_long = paksz(inparm[4],iflg64)* 3600 * S2R;
*iflg = (int)*iflg64;
if ((int)*iflg64 != 0)
return ERROR;
dzone = inparm[8];
djustify = inparm[10];
*iflg64 = isinusinvinit(radius, center_long, false_easting, false_northing,
dzone, djustify);
*iflg = (int)*iflg64;
inv_trans[insys] = isinusinv;
}
return OK;
}
int gctpc_get_latlon(unsigned char **sec, double **lon, double **lat) {
int gdt;
unsigned char *gds;
double r_maj; /* major axis */
double r_min; /* minor axis */
double lat1; /* first standard parallel */
double lat2; /* second standard parallel */
double c_lon; /* center longitude */
double c_lat; /* center latitude */
double false_east; /* x offset in meters */
double false_north;
double dx, dy;
double x0, y0;
long int (*inv_fn)();
double *llat, *llon, rlon, rlat;
int i, nnx, nny, nres, nscan;
unsigned int nnpnts;
long long_i;
gdt = code_table_3_1(sec);
gds = sec[3];
/* only process certain grids */
if (gdt != 10 && gdt != 20 && gdt != 30 && gdt != 31) return 1;
get_nxny(sec, &nnx, &nny, &nnpnts, &nres, &nscan);
/* potentially staggered */
if (nnx < 1 || nny < 1) return 1;
llat = *lat;
llon = *lon;
if (llat != NULL) {
free(llat);
free(llon);
*lat = *lon = llat = llon = NULL;
}
inv_fn = NULL;
dx = dy = 0.0;
if (gdt == 10) { // mercator
/* get earth axis */
axes_earth(sec, &r_maj, &r_min);
dy = GDS_Mercator_dy(gds);
dx = GDS_Mercator_dx(gds);
/* central point */
c_lon = GDS_Mercator_ori_angle(gds) * (M_PI/180.0);
c_lat = GDS_Mercator_latD(gds) * (M_PI/180.0);
/* find the eastling and northing of of the 1st grid point */
false_east = false_north = 0.0;
long_i = merforint(r_maj,r_min,c_lon,c_lat,false_east,false_north);
rlon = GDS_Mercator_lon1(gds) * (M_PI/180.0);
rlat = GDS_Mercator_lat1(gds) * (M_PI/180.0);
long_i = merfor(rlon, rlat, &x0, &y0);
/* initialize for 1st grid point */
x0 = -x0;
y0 = -y0;
long_i = merinvint(r_maj,r_min,c_lon,c_lat,x0,y0);
inv_fn = &merinv;
}
else if (gdt == 20) { // polar stereographic
/* get earth axis */
axes_earth(sec, &r_maj, &r_min);
dy = GDS_Polar_dy(gds);
dx = GDS_Polar_dx(gds);
/* central point */
c_lon = GDS_Polar_lov(gds) * (M_PI/180.0);
c_lat = GDS_Polar_lad(gds) * (M_PI/180.0);
/* find the eastling and northing of of the 1st grid point */
false_east = false_north = 0.0;
long_i = psforint(r_maj,r_min,c_lon,c_lat,false_east,false_north);
rlon = GDS_Polar_lon1(gds) * (M_PI/180.0);
rlat = GDS_Polar_lat1(gds) * (M_PI/180.0);
long_i = psfor(rlon, rlat, &x0, &y0);
/* initialize for 1st grid point */
x0 = -x0;
y0 = -y0;
long_i = psinvint(r_maj,r_min,c_lon,c_lat,x0,y0);
inv_fn = &psinv;
}
else if (gdt == 30) { // lambert conformal conic
/* get earth axis */
axes_earth(sec, &r_maj, &r_min);
dy = GDS_Lambert_dy(gds);
dx = GDS_Lambert_dx(gds);
//printf(">>> gctpc dx %lf, dy %lf\n", dx, dy);
/* latitudes of tangent/intersection */
lat1 = GDS_Lambert_Latin1(gds) * (M_PI/180.0);
lat2 = GDS_Lambert_Latin2(gds) * (M_PI/180.0);
/* central point */
c_lon = GDS_Lambert_Lov(gds) * (M_PI/180.0);
c_lat = GDS_Lambert_LatD(gds) * (M_PI/180.0);
/* find the eastling and northing of of the 1st grid point */
false_east = false_north = 0.0;
long_i = lamccforint(r_maj,r_min,lat1,lat2,c_lon,c_lat,false_east,false_north);
rlon = GDS_Lambert_Lo1(gds) * (M_PI/180.0);
rlat = GDS_Lambert_La1(gds) * (M_PI/180.0);
long_i = lamccfor(rlon, rlat, &x0, &y0);
/* initialize for 1st grid point */
x0 = -x0;
y0 = -y0;
long_i = lamccinvint(r_maj,r_min,lat1,lat2,c_lon,c_lat,x0,y0);
inv_fn = &lamccinv;
}
else if (gdt == 31) { // albers equal area
/* get earth axis */
axes_earth(sec, &r_maj, &r_min);
dy = GDS_Albers_dy(gds);
dx = GDS_Albers_dx(gds);
/* latitudes of tangent/intersection */
lat1 = GDS_Albers_Latin1(gds) * (M_PI/180.0);
lat2 = GDS_Albers_Latin2(gds) * (M_PI/180.0);
/* central point */
c_lon = GDS_Albers_Lov(gds) * (M_PI/180.0);
c_lat = GDS_Albers_LatD(gds) * (M_PI/180.0);
/* find the eastling and northing of of the 1st grid point */
false_east = false_north = 0.0;
long_i = alberforint(r_maj,r_min,lat1,lat2,c_lon,c_lat,false_east,false_north);
rlon = GDS_Albers_Lo1(gds) * (M_PI/180.0);
rlat = GDS_Albers_La1(gds) * (M_PI/180.0);
long_i = alberfor(rlon, rlat, &x0, &y0);
/* initialize for 1st grid point */
x0 = -x0;
y0 = -y0;
long_i = alberinvint(r_maj,r_min,lat1,lat2,c_lon,c_lat,x0,y0);
inv_fn = &alberinv;
}
if (inv_fn == NULL) return 1;
if ((*lat = llat = (double *) malloc(nnpnts * sizeof(double))) == NULL) {
fatal_error("gctpc_get_latlon memory allocation failed","");
}
if ((*lon = llon = (double *) malloc(nnpnts * sizeof(double))) == NULL) {
fatal_error("gctpc_get_latlon memory allocation failed","");
}
/* put x[] and y[] values in lon and lat */
if (stagger(sec, nnpnts, llon, llat)) fatal_error("gctpc: stagger problem","");
printf(">> stagger gctpc x00 %lf y00 %lf\n",llon[0], llat[0]);
#pragma omp parallel for schedule(static) private(i)
for (i = 0; i < nnpnts; i++) {
inv_fn(llon[i]*dx, llat[i]*dy, llon+i, llat+i);
llat[i] *= (180.0 / M_PI);
llon[i] *= (180.0 / M_PI);
if (llon[i] < 0.0) llon[i] += 360.0;
}
return 0;
}
