Re: Getting Locations using Distance

[kvale]

in reply to Getting Locations using Distance

The easiest approach is to traverse your list of locations and compute the distaance of each location from your designated position. To get locations of zip codes, try Geo::Coder::US:

use Geo::Coder::US;
Geo::Coder::US->set_db( "geocoder.db" );
my ($ora) = Geo::Coder::US->geocode(
                    "1005 Gravenstein Hwy N, 95472" );
print "O'Reilly is located at $ora->{lat} degrees north, "
                             "$ora->{long} degrees east.\n";

To compute distances, use Geo::Ellipsoid:

use Geo::Ellipsoid;
  $geo = Geo::Ellipsoid->new(ellipsoid=>'NAD27', units=>'degrees');
  @origin = ( 37.619002, -122.374843 );    # SFO
  @dest = ( 33.942536, -118.408074 );      # LAX
  ( $range, $bearing ) = $geo->to( @origin, @dest );
  ($lat,$lon) = $geo->at( @origin, 45.0, 2000 );
  ( $x, $y ) = $geo->displacement( @origin, $lat, $lon );
  @pos = $geo->location( $lat, $lon, $x, $y );