Correct datatype for latitude and longitude? (in activerecord)

Question

Should I store latitude and longitude as strings or floats (or something else)?

(I\'m using activerecord / ruby on rails, if that matters).

Update:

Mysql

Answer 1

This is what I use:

add_column :table_name, :lat, :decimal, {:precision=>10, :scale=>6}
add_column :table_name, :lng, :decimal, {:precision=>10, :scale=>6}