I want to provide a service of augmented reality in my app using the location of the user. For example, if the user frames with the device's camera a monument, it must be provided a description on it.
EDIT
Rather than display the information on the monuments framed by the device, i could simply show in which direction are located certain points of interest. But, given a certain direction (eg north), how can i determine what is in that direction within a certain radius?
I have found the solution to the question above by myself. I'm using Metaio for android! It is a powerfull tool which provides a lot of examples about Augmented Reality!