Another -ic or -ical adjective question came up recently. This answer is sourced from http://forum.wordreference.com/showthread.php?t=11622 from the member Focalist:
graphic
1. relating to visual art, especially involving drawing, engraving, or lettering.
2 giving vividly explicit detail.
3 of or in the form of a graph.
graphical
1. of or in the form of a graph.
2 relating to visual art or computer graphics.
(Note that the adverbial form of both is: graphically)
Notice that, despite the overlaps, only the “giving vividly explicit detail” and “relating to computer graphics” are not common to both.
robertdesenior 
You could also make a case for photographical by analogy to graphical and indeed their are examples on Google for “photographical data”, but http://www.thefreedictionary.com/ doesn’t list it.
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