Accurate position using px4flow and pixhawk

ArduCopter
1

Hi,
I were looking for an hardware to get an accurate position of the drone. After a little search I find the optical flow concept.
My question is does the px4flow give me the position of the drone? and is it more accurate than the gps?
if yes how can I get the position parameter did the QGroundControl help here?
thanks

2

px4flow gives you a relative position, not an absolute position like GPS. What do you mean exactly by accurate? Are you talking about precision or are you talking about accuracy? Take a look at wikipedia to find the difference between both.

3

Thank you for your comment, yes I know that gives me a relative position, not like GPS, and I was meaning accuracy, not precision here despite precision also is important. If you know how much it is accurate and how to get this data in my computer while the drone is still flying or have a good source I will appreciate any help.