geosupport.h File Reference

#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)

Variables
const std::string	OMNISCI_GEO_PREFIX {"omnisci_geo"}
const std::string	LEGACY_GEO_PREFIX {"mapd_geo"}

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 38 of file geosupport.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 26 of file geosupport.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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Variable Documentation

const std::string LEGACY_GEO_PREFIX {"mapd_geo"}

Definition at line 24 of file geosupport.h.

Referenced by MapDHandler::import_geo_table().

const std::string OMNISCI_GEO_PREFIX {"omnisci_geo"}

Definition at line 23 of file geosupport.h.

Referenced by MapDHandler::detect_column_types(), MapDHandler::import_geo_table(), and Importer_NS::ImportDriver::importGeoTable().