Precis RTK system is being used for some pretty cool stuff. Mr. Stephen Noble, owner of Drone Surveying, used Precis RTK boards to provide land survey and aerial photography service in Australia. By leveraging L1/L2 GPS frequencies for accuracy and reliability, when fixed in RTK or PPK mode, their equipment provides centimeter absolute accuracy. Check it out.
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RTK GPS for Land Survey and Aerial Photography Service
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RTK GPS for Land Survey and Aerial Photography Service