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Jan 05, 2016, 07:34 PM
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Drone topographical survey for agriculture high precision GPS


large number of Drone topographical survey for agriculture projects failed due to low-precision GPS installed on commercial drone.

What have we done wrong - is the first question.

recent message from manager of one large-scale agriculture project
We are developing a large-scale agriculture project in Nigeria (5,000ha) and started to use drones to survey and map topography.
The intention was then to use the Digital Elevation Model for irrigation planning and design. However, when we post processed the images we got very large x y z errors - please see the photos below.
1. Could anyone tell us where we have done wrong? Can we correct NOW (after the aerial survey)?"

Ok, if you are using low-precision GPS on your drone yopu may have expended
to get problems, since your drone set to fly AltHold in Mission Planner
flies ups and downs, so geotagged imaginery is not fit for post processing.

I am developing concept of high-precision GPS based on rtcm ntrip streams
to set up fixed Ground Control Point and use this geolocated point to receive
GPS data from a standard GPS/GLONAS, calculate diff and RTK corrections
and feed them over radio to GPS unit installed in the drone to correct
mobile GPS data.

Since either GPS data streams get clocked at the same frequency 1Hz to 50Hz,
timestamped, all I need is to correct mobile GPS on the drone to keep autopilot
in AltHold mode, visually verified with glasses ( 3D multi point triangulation).

Next I plan to set up more fixed Ground Control Points to brodcast corrections
to server establisged close to ground station to process data streams on-the-fly
and feed corrections to ground control station via bluetooth/ Wifi,
to be fed to autopilot via radio.

Please let me know your opinion and suggestions.

You are free to contact me about your drone topographical survey for agriculture plans and projects for advise and consulting.

I will try to repair your ortho imaginery in case something went wrong
and you cannot ortho scan the area once again.

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