PX4FLOW altitude limitations?

Hello,

I’ve been reading the PX4FLOW overview / setup guide:
http://ardupilot.org/copter/docs/common-px4flow-overview.html

At one point it says “optical flow requires good sonar/range finder data when the optical flow is enabled”. So I’m wondering, what’s the upper altitude limit for using optical flow to hold location?

For higher altitudes, can’t the barometer reading give enough altitude information for the flow calculations?

Cheers,

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Do u get the answer now?