在Gissky上發現了戴勤奮老師關于坐标轉換的程式以及公式,程式的界面和轉換精度都值得稱贊,隻是可惜沒有提供實作的源碼,最近由于工作需要正好需要實作這部分功能,通過對戴勤奮老師提供的公式以及OGP(歐洲石油勘探組織)最新的《Coordinate Conversions and Transformations including Formulas》文檔進行了研究,利用程式将UTM投影正轉實作,現釋出出來供大家共同學習,也希望大家指出程式中的不足。
LLtoUTM( double a, double f, const double Lat, const double Long,
double LongOrigin, double FN, double & UTMNorthing, double & UTMEasting)
... {
//e表示WGS84第一偏心率,eSquare表示e的平方,
double eSquare =(2*f-f*f) ;
double k0 = 0.9996;
double e2Square;
double V, T, C, A, M;
//確定longtitude位于-180.00----179.9之間
double LongTemp = (Long+180)-int((Long+180)/360)*360-180;
double LatRad = Lat*PI/180;
double LongRad = LongTemp*PI/180;
double LongOriginRad;
LongOriginRad = LongOrigin * PI/180;
e2Square = (eSquare)/(1-eSquare);
V = a/sqrt(1-eSquare*sin(LatRad)*sin(LatRad));
T = tan(LatRad)*tan(LatRad);
C = e2Square*cos(LatRad)*cos(LatRad);
A = cos(LatRad)*(LongRad-LongOriginRad);
M = a*((1-eSquare/4-3*eSquare*eSquare/64-5*eSquare*eSquare*eSquare/256)*LatRad
-(3*eSquare/8+3*eSquare*eSquare/32+45*eSquare*eSquare*eSquare/1024)*sin(2*LatRad)
+(15*eSquare*eSquare/256+45*eSquare*eSquare*eSquare/1024)*sin(4*LatRad)
-(35*eSquare*eSquare*eSquare/3072)*sin(6*LatRad));
UTMEasting = (double)(k0*V*(A+(1-T+C)*A*A*A/6
+ (5-18*T+T*T+72*C-58*e2Square)*A*A*A*A*A/120)+ 500000.0);
UTMNorthing = (double)(k0*(M+V*tan(LatRad)*(A*A/2+(5-T+9*C+4*C*C)*A*A*A*A/24
+(61-58*T+T*T+600*C-330*e2Square)*A*A*A*A*A*A/720)));
//南半球緯度起點為10000000.0m
UTMNorthing=UTMNorthing+FN;
}
本程式實作的公式請參考《Coordinate Conversions and Transformations including Formulas》文檔第35頁,如果你需要此文檔,請和我聯系!也歡迎大家提出程式的不足。 [轉載請注明出處,謝謝!]