I did a bit of a background check of my own after seeing some pretty old aerial imagery in Apple/Google/Bing Maps after wanting to check on a couple of local sites for a client, and now I'm cutting those companies some slack. I've been out of the land development consulting "game" for about 3-1/2 years now, and I used to have access via paid subscriptions to data/information on GIS sites - not just the free access we all have. Local to the Portland metro area is "Metro", which covers the tri-country area - and the GIS source is named RLIS (Metros Regional Land Information System), and I knew the GIS techs by name. Their data is available via subscription - it's about $500 per year, and used to be $1k per year for quarterly DVDs - and we returned the old DVD as we couldn't keep it.
I started working for the local transit agency in '94, two blocks from Metro, and moved into consulting in late '99. Metro aggregated (from private and public flyovers every 6 months to show tree cover and no tree cover) made available aerial imagery every year that was updated starting in '94, coincidentally.
I checked the RLIS dataset list today and was a bit surprised to see that their "yearly" aerial datasets stopped in 2011, just after I got out of land development. For me, now I better understand why Apple/Google/Bing Maps are so out of date in my area - the source aerial data hasn't been updated since 2011 (
http://rlisdiscovery.oregonmetro.gov/?resourceID=6#). That's why the Mall near me still shows up on Google Maps (2010) and the graded site shows up in Apple Maps right after the Mall was torn down (2011) - but all of the new businesses don't show up at all in the aerials or the POIs. Parts of King County (Seattle and surrounding area) also are lacking newer details.
Aerials aren't cheap - a flyover of a site I worked on in 2006 cost my client $16k for 1-foot detail of a 40-acre site. Heck, I used to be happy with 5-foot or 10-foot detail in an orthophoto. Our latest Metro 10 foot regional orthophoto was aggregated in 2010, and I know several areas that are out of date.
So, I'm off to Cairo tomorrow to have lunch with my friend Dan, who cuts hair for a living (see above). Above isn't quite a rant, but I've got more perspective into why some of those aerials aren't quite so accurate anymore and I thought I'd share...