[Google Maps API v2] Imagery updates for Africa

Hi, I am new to this group, so apologies if my questions seem dumb. I
am interested in updated imagery of East Africa, specially north
Kenya. I have a control site that I monitor, which in the dust bowl
of Turkana Province. as far as I can make out the imagery is from
some time during Q4 of 2011. Can anyone tell me how often such areas
are updated and how I can see what the date of the imagery shown is?
Many thanks.

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