John Deere Guidelines using CORS

Hardware Autosteer
1

Hey guys. Not exactly AgOpen, however I can see there are a lot of switched on people in this group who will no doubt be able to help with this one.

So, approx 12 years ago, lines were set in a paddock (field for countries other than Australia) using Greenstar with a SF3000 receiver. Today we grabbed the coordinates and put them into a screen connected to a CORS using GDA2020 for the coordinate system, and the line was out over 1 metre. By this I am not surprised, however I am struggling to find what coordinate system John Deere use, and how the coordinates we have can be converted to the GDA2020’s system.

Any help or ideas greatly appreciated

2

2 things that come to my mind:

ITRF vs ETRF → when using the international PPP solution we have to converge it to europe see: NRCAN ETRF2000 converter

2nd thing: Australia is moving / drifting so maybe the coordinates you’ve set 12 years ago wander by 1 meter?

Not sure how to convert to GDA2020

3

Thanks for your help. Yea Australia moves about 7cm per year. The more research I do on it, the more I realise we are just going to have to go out and create new guidelines from scratch

4

Australia CORS updated coordinates from AGD94 to GDA2020 to allow for this plate movement.

image
image1600×1054 38.4 KB

5

Thanks for your response. I tried the coordinates using GDA94 and it was worse