Messages

1

General / Re: RTK + single GCP

« on: October 04, 2022, 10:17:20 AM »

Hi everybody
I finally got the infos I needed for the use of the RTK-2 antenna. It's a shame that DJI nowhere tells the user of how to use it correctly (and all youtube tutorials just show how to connect the drone with the RTK-antenna, but not how to be precise). So here is how to have high accuracy orthophotos:
- The RTK-2 antenna is only a "relative" accuracy system. So the antenna has to know exactly where it is.
- With a hand held GPS take the exact position of where you put the antenna (antenna pole)
- The x,y,z must be WGS84
- The z coordinate must be added the length of the pole PLUS the height of the antenna head (14.7 cm).
- These x,y,z coordinates must be insertet in the DJI GS-Pro app.
- The antenna is then correcting the drone to this position.

 hope this helps others

sincerely

christof

2

General / Re: RTK + single GCP

« on: June 07, 2022, 05:47:58 PM »

Hi there
I am new in using Phantom 4 Multispectral with D-RTK2 antenna. I was working with the tutorial from the AGISOFT website (https://agisoft.freshdesk.com/support/solutions/articles/31000159853-dji-phantom-4-multispectral-data-processing) and ralize that flying the same mission over and over again, the accuracy of the orthophotos differ between 0.7 and 4.7 m from one ortho to the other. So looking up in the forum I found that you can't get precise orthophotos that are located on the cm without at least one GCP and setting some values in the "Reference settings".

So here's my question: can anyone get me a detailed workflow of how to proceed properly (like in the tutorial abouve but with all the additional settings and GCP)? would be greate!

thanks a lot for your help

cheers

christof

3

General / Re: Issue of orthophoto with DJI Phantom4 Multispectral

« on: February 08, 2022, 02:10:07 PM »

Hi there
the last post without a solution was october 2021. Is there a solution? Has Agisoft found a way to solve this problem?
thanks a lot
Christof