Upload image from Rhodes and read exif.gps data using RoR

from_ipad2_choose_picture_to_webapp

------------inspect exif_info.exif--------------

[{:orientation=>#<EXIFR::TIFF::Orientation:TopLeft(1)>, :color_space=>1, :pixel_x_dimension=>320,
 :pixel_y_dimension=>239}]

-----------inspect exif_info.gps--------------
nil

from_ipad2_take_picture_to_webapp

------------inspect exif_info.exif--------------

[{:orientation=>#<EXIFR::TIFF::Orientation:TopLeft(1)>, :color_space=>1, :pixel_x_dimension=>320, 
:pixel_y_dimension=>320}]

-----------inspect exif_info.gps--------------
nil

from_laptop_safari_browser_to_webapp

------------inspect exif_info.exif--------------

[{:make=>"Apple", :model=>"iPad 2", :orientation=>#<EXIFR::TIFF::Orientation:BottomRight(3)>, :x_resolution=>
(72/1), :y_resolution=>(72/1), :resolution_unit=>2, :software=>"5.0", :date_time=>2011-10-24 15:42:10 +0530, 
:ycb_cr_positioning=>1, :exposure_time=>(1/30), :f_number=>(12/5), :exposure_program=>2, 
:iso_speed_ratings=>400, :date_time_original=>2011-10-24 15:42:10 +0530, :date_time_digitized=>2011-10-24
 15:42:10 +0530, :shutter_speed_value=>(6325/1289), :aperture_value=>(4845/1918), :brightness_value=>
(10063/6829), :metering_mode=>5, :flash=>32, :focal_length=>(203/100), :color_space=>1, :pixel_x_dimension=>960,
 :pixel_y_dimension=>720, :sensing_method=>2, :exposure_mode=>0, :white_balance=>0, 
:focal_length_in_35mm_film=>32, :scene_capture_type=>0, :sharpness=>0, :gps_latitude_ref=>"N", :gps_latitude=>
[(13/1), (283/100), (0/1)], :gps_longitude_ref=>"E", :gps_longitude=>[(80/1), (1189/100), (0/1)],
 :gps_altitude_ref=>"\x00", :gps_altitude=>(26091/1024), :gps_time_stamp=>[(10/1), (12/1), (583/1)], 
:gps_img_direction_ref=>"T", :gps_img_direction=>(37651/106)}, {:compression=>6, :x_resolution=>(72/1), 
:y_resolution=>(72/1), :resolution_unit=>2, :jpeg_interchange_format=>874, 
:jpeg_interchange_format_length=>7610}]

-----------inspect exif_info.gps--------------

#<struct EXIFR::TIFF::GPS latitude=13.047166666666667, longitude=80.19816666666668, altitude=25.4794921875, 
image_direction=355.1981132075472>

photo_controller_rhodes.rb

  def choose_picture
    Camera::choose_picture(url_for :action => :choose_picture_callback)
  end
  def choose_picture_callback
     @@image = @params["image_uri"]
    # WebView.navigate(<display chosen image on .erb file>)
  end