Identify a building applying SURF/SIFT algorithm on it's picture and obtain GPS coordinates

Question

I would like to extract the SURF/SIFT feature points from a picture of a building or a landmark and identify its GPS coordinates.

I'm using OpenCV for Android for SURF.

I would like to know if there's an API which returns the GPS coordinates of the building in the picture, I can do any kind of transformations on the picture before sending out to the server.

Thanks.

Answer 1

Depending on the camera, longitude and latitude are attached to your photo’s EXIF information. Exiv2 is a C++ library and a command line utility to manage image metadata. With several images of same building, extracting SURF and calibrating cameras (images) you can retrieve "exact" coordinate in the reference world. Is that what you achieve to do ?