NAME

Geo::Direction::Distance - Process between Lat-Lng coordinates and direction - distance

SYNOPSIS

  use Geo::Direction::Distance;
  # Export two functions, dirdist2latlng and latlng2dirdist.
  
  # Calcurate direction/distance from two coordinates (in wgs84 ellipsoid,degree format)
  # Return values are direction (0-360 degree format), distance [m unit].
  my @fromlatlng  = (35.000,135.000);
  my @tolatlng    = (36.000,136.000);
  my ($dir,$dist) = latlng2dirdist(@fromlatlng,@tolatlng);
  
  # Calcurate coordinate from one coordinate and direction, distance.
  # Return values are direction (0-360 degree format), distance [m unit].
  my @fromlatlng  = (35.000,135.000);
  my ($dir,$dist) = (270.000,5000.00);
  my @tolatlng    = dirdist2latlng(@fromlatlng,$dir,$dist);
  
  # If you want to use other ellipsoid, you can set ellipsoid name as option.
  my ($dir,$dist) = latlng2dirdist(@fromlatlng,@tolatlng,{ellps => clrk66});
  
  # You can also set original ellipsoid parameter.
  # parameter keys are same with proj4.
  my @tolatlng    = dirdist2latlng(@fromlatlng,$dir,$dist,{a => 6378165.0, rf => 298.3});

EXPORT METHODS

• dirdist2latlng

• latlng2dirdist

INTERNAL METHODS

• p2v_pp

• set_af

• v2p_pp

TODO

Get ellipsoid information from Geo::Proj4, Geo::Proj or Geo::Shape object.

Can accept other distance unit

DEPENDENCIES

Math::Trig

AUTHOR

OHTSUKA Ko-hei <nene@kokogiko.net>

LICENCE AND COPYRIGHT

Copyright (c) 2008, OHTSUKA Ko-hei <nene@kokogiko.net>. All rights reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.

DISCLAIMER OF WARRANTY

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