Newbie Altitude Question

Sorry if this is a stupid question but I am wondering what is the best way to get accurate altitude data.

The project I am working on involves very long flight times (greater than 1 hour) at altitudes of up to 1000' feet (I know about the NAS restrictions but am just using this altitude as a target).

Because of the long flight times, it does not seem that barometric sensing would work (and I am not sure how accurate that would be anyway).  Also, I understand that the altitude data from GPS is unreliable and can be off be several meters.

I have an ArduIMU and was just wondering if there is an accurate way of getting altitude data beyond sort of dead reckoning.

Thanks for any insight,
James

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