pj_msfn.cpp

projapi是一个关于GIS行业投影转换的程序库

#include "stdafx.h"

/* determine constant small m */
#ifndef lint
static const char SCCSID[]="@(#)pj_msfn.c	4.3	93/06/12	GIE	REL";
#endif
#include <math.h>
#include "projects.h"
	
double pj_msfn(double sinphi, double cosphi, double es)
{
	return (cosphi / sqrt (1. - es * sinphi * sinphi));
}