Height Map

We were discussing about height maps, it looks we’d need the following data:
epoch, Lat, Lon, Height, Heading, Roll, antenna height, workswitch

I think it could be stored similarly how we do sections.txt
Then using post process (or perhaps even during operation? ) we could enhance the data for higher resolution.
10Hz / per line and +2 extra lines based on roll?

cm precision? :smiley:

Here’s what Trimble can do:


Good idea!
With the help of this feature, the drainage routes can be easily designed on my waterlogged areas. In my opinion, collecting data every 20-30 square meters (relative to the width of the implement) should be sufficient for the purpose I would use it for.

sounds like an awesome idea. collect your field elevations while seeding etc. then go back and design your drains with opengrade

Make sure you use orthometric heights for drainage design. Orthometric height datums are normally related to mean sea level and take into account the effect of gravity.


Is there any progress? I’m also interested.

Wow I’ve been installing drain tile a long time and have never even thought about that. It looks like roughly 8in / mile according to google. It’s minimal but can add up. Thanks for knowledge!

8 inch per mile sounds a lot to me, is that on a rare spot or a relatively common figure?

Aren’t drainage machines usually using laser or old systems just visual control, neither one considering gravity changes (within the worked area).

That’s a straight line (laser) sitting tangent (level) to the diameter of the Earth (round).

If you put the laser at the highest part of the field then all the errors just lead to extra slope.

That is some math from Quora. Average drop. Basically at sea. 8" per mile is .0126% slope. It’s squared so shorter distance would be much less slope. More distance much greater slope. I would say hardly noticable within laser range.

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So the main thing is the curvature of the face of the earth, not that much from the local variation of gravity. Would be nice to see example figures for the latter but already the simple curvature surprised me. Should I say we luckily do not have 15 mile long fields as in the Quora example. :grinning:

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