> I would like to generate the image before user's view frustum visit
> the area.

There was a discussion here a while back about an alternative
strategy.

Continue to generate tiles on-the-fly as requested, but then store
them.

When receiving a tile request, look to see if it is stored already, if
not make (and store) one.

That way you'll only have to make a few at a time, only the ones that
are really needed/used get stored. (you might like to calculate how
much storage space a full tile set takes up)

You could assign a build date to each tile if you want to rebuild them
periodically, because the source data may change.

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