Module: GeoFoo

Defined in:
lib/geo_foo.rb,
lib/geo_foo/core.rb,
lib/geo_foo/scope.rb,
lib/geo_foo/active_record.rb

Defined Under Namespace

Modules: ActiveRecord, ClassMethods, Core, InstanceMethods, Scope

Constant Summary collapse

SRID =

WGS-84

4326
EarthRadius =

meters (as used by postgis’ ST_Distance_Sphere())

6370986.0

Class Method Summary collapse

Class Method Details

.as_point(lat, lon) ⇒ Object

return a postgis string representation of the given coordinates



7
8
9
10
11
12
 
# File 'lib/geo_foo/core.rb', line 7

def self.as_point lat, lon
  # Intentionally use (lat,lon) and not (lon,lat), because latitude is the
  # 'horizontal' coordinate.
  # See: http://archives.postgresql.org/pgsql-general/2008-02/msg01393.php
  "ST_GeomFromText('POINT(#{lon} #{lat})', #{SRID})"
end