On 8/8/2011 11:47 AM, Buba Smith wrote:

Tim ,
While attempting some "Due Diligence " I began to wonder how often
Google Earth is updated . For example how can one determine crop
height from Google . Further , are the effects of a 600% snow pack
reflected ? I was surprised by the amount of water in the valley this
year . Can you make out livestock or single wire powerlines from
Google ?

My observation is Google images can be over more than 5 years old, so
making serious decisions based on easily changed attributes (crops,
fences, livestock, sprinklers, power lines, etc) is too risky. I do use
it to measure widths and lengths when I see a runway that isn't on the
charts, just to back up my estimate from the air. The assumption is a
runway that I see every few months is not likely to change; of course,
they do sometimes disappear, or another one somewhere else appears, so I
do not count on them like I do municipal airports.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)