/******************************************************************************* NAME STATE PLANE PURPOSE: Transforms input Easting and Northing to longitude and latitude for the State Plane projection. The Easting and Northing must be in meters. The longitude and latitude values will be returned in radians. PROGRAMMER DATE ---------- ---- T. Mittan Apr, 1993 S. Nelson Jan, 1998 Took out reinitialization test. Initialization will be performed in all cases. Added comments. ALGORITHM REFERENCES 1. Snyder, John P., "Map Projections--A Working Manual", U.S. Geological Survey Professional Paper 1395 (Supersedes USGS Bulletin 1532), United State Government Printing Office, Washington D.C., 1987. 2. Snyder, John P. and Voxland, Philip M., "An Album of Map Projections", U.S. Geological Survey Professional Paper 1453 , United State Government Printing Office, Washington D.C., 1989. *******************************************************************************/ #include #include #include "cproj.h" static int32_t id; /* indicates which projection is to be transformed */ /* set the initialized values for zone and spheroid. This value determines wheather to initialize or not ------------------------------------------------------------------------*/ static long inzone = 0; /* previous zone value */ static long insphere = -1; /* previous spheroid value */ /* the Nad 27 State Plane Zones are set in this array --------------------------------------------------*/ static long nad27[134] = {101,102,5010,5300,201,202,203,301,302,401,402,403, 404,405,406,407,501,502,503,600,700,901,902,903,1001,1002, 5101,5102,5103,5104,5105,1101,1102,1103,1201,1202,1301,1302, 1401,1402,1501,1502,1601,1602,1701,1702,1703,1801,1802,1900, 2001,2002,2101,2102,2103,2111,2112,2113,2201,2202,2203,2301, 2302,2401,2402,2403,2501,2502,2503,2601,2602,2701,2702,2703, 2800,2900,3001,3002,3003,3101,3102,3103,3104,3200,3301,3302, 3401,3402,3501,3502,3601,3602,3701,3702,3800,3901,3902,4001, 4002,4100,4201,4202,4203,4204,4205,4301,4302,4303,4400,4501, 4502,4601,4602,4701,4702,4801,4802,4803,4901,4902,4903,4904, 5001,5002,5003,5004,5005,5006,5007,5008,5009,5201,5202,5400}; /* the Nad 83 State Plane Zones are set in this array --------------------------------------------------*/ static long nad83[134] = {101,102,5010,5300,201,202,203,301,302,401,402,403, 404,405,406,0000,501,502,503,600,700,901,902,903,1001,1002, 5101,5102,5103,5104,5105,1101,1102,1103,1201,1202,1301,1302, 1401,1402,1501,1502,1601,1602,1701,1702,1703,1801,1802,1900, 2001,2002,2101,2102,2103,2111,2112,2113,2201,2202,2203,2301, 2302,2401,2402,2403,2500,0000,0000,2600,0000,2701,2702,2703, 2800,2900,3001,3002,3003,3101,3102,3103,3104,3200,3301,3302, 3401,3402,3501,3502,3601,3602,3701,3702,3800,3900,0000,4001, 4002,4100,4201,4202,4203,4204,4205,4301,4302,4303,4400,4501, 4502,4601,4602,4701,4702,4801,4802,4803,4901,4902,4903,4904, 5001,5002,5003,5004,5005,5006,5007,5008,5009,5200,0000,5400}; /* Initialize the State Plane projection ------------------------------------*/ long stplninvint( zone,sphere,fn27,fn83) long zone; /* zone number */ long sphere; /* spheroid number */ char *fn27; /* name of file containing the NAD27 parameters */ char *fn83; /* name of file containing the NAD83 parameters */ { long ind; /* index for the zone */ long i; /* loop control variable */ long nadval; /* datum value for the report (27 or 83) */ double table[9]; /* array containing the projection information */ char pname[33]; /* projection name */ char buf[100]; /* buffer for error messages */ /* projection parameters */ double r_maj,r_min,scale_fact,center_lon; double center_lat,false_east,false_north; double azimuth,lat_orig,lon_orig,lon1,lat1,lon2,lat2; long mode,iflg; long status; FILE *ptr; ind = -1; /* Find the index for the zone --------------------------*/ if (zone > 0) { if (sphere == 0) { for (i = 0; i < 134; i++) { if (zone == nad27[i]) { ind = i; break; } } } else if (sphere == 8) { for (i = 0; i < 134; i++) { if (zone == nad83[i]) { ind = i; break; } } } else { sprintf(buf,"Illegal spheroid #%4d",sphere); p_error(buf,"state-spheroid"); return(23); } } if (ind == -1) { sprintf(buf,"Illegal zone #%4d for spheroid #%4d",zone,sphere); p_error(buf,"state-init"); return(21); } /* Open and read the parameter file to get this zone's parameters --------------------------------------------------------------*/ if (sphere == 0) ptr = fopen(fn27,"r"); else ptr = fopen(fn83,"r"); if (ptr == NULL) { p_error("Error opening State Plane parameter file","state-inv"); return(22); } fseek(ptr,ind * 432, 0); status = ftell(ptr); fread(pname,sizeof(char),32,ptr); fread(&id,sizeof(id),1,ptr); fread(table,sizeof(double),9,ptr); fclose(ptr); if (id <= 0) { sprintf(buf,"Illegal zone #%4d for spheroid #%4d",zone,sphere); p_error(buf,"state-init"); return(21); } /* Report parameters to the user -----------------------------*/ ptitle("STATE PLANE"); genrpt_long(zone,"Zone: "); if (sphere == 0) nadval = 27; else nadval = 83; genrpt_long(nadval,"Datum: NAD"); /* initialize proper projection -----------------------------*/ r_maj = table[0]; r_min = (sqrt(1.0 - table[1])) * table[0]; if (id == 1) { scale_fact = table[3]; center_lon = paksz(pakcz(table[2]),&iflg) * D2R; if (iflg != 0) return(iflg); center_lat = paksz(pakcz(table[6]),&iflg) * D2R; if (iflg != 0) return(iflg); false_east = table[7]; false_north = table[8]; tminvint(r_maj,r_min,scale_fact,center_lon,center_lat,false_east, false_north); } else if (id == 2) { lat1 = paksz(pakcz(table[5]),&iflg) * D2R; if (iflg != 0) return(iflg); lat2 = paksz(pakcz(table[4]),&iflg) * D2R; if (iflg != 0) return(iflg); center_lon = paksz(pakcz(table[2]),&iflg) * D2R; if (iflg != 0) return(iflg); center_lat = paksz(pakcz(table[6]),&iflg) * D2R; if (iflg != 0) return(iflg); false_east = table[7]; false_north = table[8]; lamccinvint(r_maj,r_min,lat1,lat2,center_lon,center_lat,false_east, false_north); } else if (id == 3) { center_lon = paksz(pakcz(table[2]),&iflg) * D2R; if (iflg != 0) return(iflg); center_lat = paksz(pakcz(table[3]),&iflg) * D2R; if (iflg != 0) return(iflg); false_east = table[4]; false_north = table[5]; polyinvint(r_maj,r_min,center_lon,center_lat,false_east,false_north); } else if (id == 4) { scale_fact = table[3]; azimuth = paksz(pakcz(table[5]),&iflg) * D2R; if (iflg != 0) return(iflg); lon_orig = paksz(pakcz(table[2]),&iflg) * D2R; if (iflg != 0) return(iflg); lat_orig = paksz(pakcz(table[6]),&iflg) * D2R; if (iflg != 0) return(iflg); false_east = table[7]; false_north = table[8]; mode = 1; omerinvint(r_maj,r_min,scale_fact,azimuth,lon_orig,lat_orig,false_east, false_north,lon1,lat1,lon2,lat2,mode); } return(OK); } /* State Plane inverse equations--mapping x,y to lat/long -----------------------------------------------------*/ long stplninv(x, y, lon, lat) double x; /* (O) X projection coordinate */ double y; /* (O) Y projection coordinate */ double *lon; /* (I) Longitude */ double *lat; /* (I) Latitude */ { long iflg; /* Inverse equations -----------------*/ if (id == 1) { if ((iflg = tminv(x, y, lon, lat)) != 0) return(iflg); } else if (id == 2) { if ((iflg = lamccinv(x, y, lon, lat)) != 0) return(iflg); } else if (id == 3) { if ((iflg = polyinv(x, y, lon, lat)) != 0) return(iflg); } else if (id == 4) { if ((iflg = omerinv(x, y, lon, lat)) != 0) return(iflg); } return(OK); }