Greetings All!

OK, I'm still waiting for somebody from Google Maps Enterprise Sales
Team to get back to me from my initial contact / form submission
attempt from almost two weeks ago.  (I just resubmitted the form
again, in case they somehow didn't get it the first time.)

Anyways, I was wondering if anybody knows or has studied how
frequently and in what situations a Google Map application will
actually query back to Google's servers... especially given the fact
that I know the client browser will cache up a lot of the data?

The application I've got basically loads a single Google map and then
will autorefresh itself every, say, 90 seconds (although that can be
adjusted).   OK, with the initial load, I know we're going to fetch
how-ever-many map tiles from Google... and we're going to fetch the
javascript files from Google that make the map "work".... plus any pin
images we may need.

But, after that, if we just autorefresh the page, the browser
shouldn't actually have to query Google again for anything, should
it?  Shouldn't everything still be in the cache?

At what point do browsers decide to go try to fetch new info?  (I know
you can set this in a page header for the webpage that CONTAINS the
Google Map... but I would think the map itself would be "treated
differently" ??)

I realize that if a user zooms out or in, then we're going to have to
fetch a new set of map tiles.   And of course, that would get cached
by the browser too, at least for a while.

I'm trying to get a better understanding of how often a single user of
my application might actually be querying Google for information....
because I think I've read that Google Maps Enterprise charges a base
fee, but then additional fees if the number of queries you make
exceeds a certain level.    That got me thinking:  "what constitutes
one query?"    Well, probably the fetching of a single file?  Or maybe
the fetching of a single set of map tiles?   Not sure.

If anybody can shed a bit of light on this subject for me, I'd greatly
appreciate it!  It would help me prepare for talking with the folks at
Google Enterprise, plus it would help me come up with some sort of
"expected usage" estimates on my end.


Thanks!

-= Dave =-


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