I have downloaded latest version of Photoscan (1.1.0.2004).
I wanted to give x,y,z coordinates of my images but I' cann't do it.
There is no ground control button now.
Instead there is reference button which doesn't allow to give x,y,z of the images.
In last version (1.0.2.1824), there was ground control and there by clicking on image you could give x,y,z of the images.