#include <cmath>
#include <string>

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Functions
std::pair< double, double >	geotransform_4326_to_900913 (const double lon, const double lat)

std::pair< double, double >	geotransform (const std::string &src_proj, const std::string &dst_proj, const double x, const double y)

Function Documentation

std::pair<double, double> geotransform	(	const std::string &	src_proj,
		const std::string &	dst_proj,
		const double	x,
		const double	y
	)

inline

Definition at line 34 of file Transforms.h.

References geotransform_4326_to_900913().

                                                               {
   return geotransform_4326_to_900913(x, y);
 }

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std::pair<double, double> geotransform_4326_to_900913	(	const double	lon,
		const double	lat
	)

inline

Definition at line 22 of file Transforms.h.

References pi().

Referenced by geotransform().

                                                                                {
   static const double e_circ = 40075016.68;  // Earth's circumference, meters
   static const double e_circ_360 = e_circ / 360;
   static const double pi = std::acos(-1);
 
   std::pair<double, double> ll;
   ll.first = lon * e_circ_360;
   ll.second = e_circ_360 * std::log(std::tan((90 + lat) * pi / 360)) / (pi / 180);
   return ll;
 }

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Function Documentation