i.ortho.photo: DEM and photos resolution

[Luciano Caroti]

Hi, I'm Luciano Caroti and I'm working on orthorectification using GRASS 
4.1 on linux system. I have some questions:
        -Which is the optimal DEM resolutions to rectify 2m resolution photo?
        -What problems could I introduce into data using 100m DEM and 2m photos
?
        -Where could I find bibliographic references on this argument 
(problems using DEM and photos having different resolution ) ?

Thanks in advance.

Luciano Caroti
Earth Sciences Department
Via G. La Pira n.4
50100 Florence 
ITALY

Email: luciano at steno.geo.unifi.it