gistfile1.txt

# geographic postgis

>> DB.get :st.distance( :st.geogfromwkb( :st.makepoint(-122.6764, 45.5165) ), :st.geogfromwkb( :st.makepoint(-122.6864, 45.5265) ) )
=> 1358.549604392

# geomteric postgis (?)

>> DB.get :st.distance( :st.transform(:st.setsrid(:st.makepoint(-122.6764, 45.5165), 4326), 3857), :st.transform(:st.setsrid(:st.makepoint(-122.6864, 45.5265), 4326), 3857) )
=> 1939.9894392485

# terraformer ruby (using port of mapattack js gc distance)

>> Terraformer::Coordinate.new(-122.6764, 45.5165).great_circle_distance Terraformer::Coordinate.new(-122.6864, 45.5265)
=> 1357.7162840942958

# terraformer + mapattack js

> gc_distance(new tf.Point([-122.6764, 45.5165]), new tf.Point([-122.6864, 45.5265]));
1357.716284094343

# redis-geo
> geoadd test 45.5165 -122.6764 a 45.5265 -122.6864 b
> georadius test 45.5165 -122.6764 1360 m withdistance
1) 1) "a"
   2) "0.13"
2) 1) "b"
   2) "1358.13"