The time to prepare the photographic database would be long, and
costly, and certainly involve massive amounts of patience, and in a
time of economic floundering, when the US at least has been cutting
back its "discretionary" science spending and certain vociferous
factions antithetical to Science have risen up (especially in
connection to "ClimateGate"), most researchers opting to take
personal projects on should have to shoulder the burden of their
desires. Any further increase in the quality of virtual data as a
resource takes time and money, and we can spend that either
travelling to the sources, or paying for the sources to develop
resources to negate that.