Good morning, I'm looking for a laser lidar to measure the grass height. This is a farm project, I need a sensor on a drone to measure the grass height. I would like to know if you rekon that laser lidar would be the best solution ? If yes which one do you advise me ? I need one that could get ground level AND the top of the grass. Else, if you rekon it won't work, one for the ground level and i will use an ultrasonic sensor for the top of the grass. Thank you very much for your help, Clement.

When we tried to use Ultra Sonic and Laser rangers for measuring freeboard of ships (thats the distance from deckline to surface of water) - we had serious trouble. That's at relatively short distance of 20m and less ...

Any movement of the water surface - even a tiny ripple threw the unit of and ERROR shown.

With grass - I would imagine even worse as its not dense enough to create the reflected beam to measure. Lets be honest - the VPS on the Pro / Adv models has enough trouble with grass !

If you do find a unit to work ... we'd be interested. I assume you are going to be far higher than 20m ? As the range increases - the problem increases exponentially.

Ok thant you for your answer, which laser did you use exactly ?
Do you have any idea how I could measure this grass height ?
No i don't want to be as high as that, just need to be arround 5m (to make sure i won't crash in a water pivot)

Handheld professional measuring gear similar to Architects and Land Surveyors.

We actually found we obtained same results with budget local shop gear !! at vastly lower cost. But it was not reliable due to the surfaces to read off from.

We shelved the whole idea.

Nigel

ok thank you, never used one.
I'm gona try to find an other way.
Thank's