Monitor the land level

[iHunt101]

Hi, i was workign on a project that measure the land level if it is sinking. Is there any additional hardware do i need to this this thing?

[Gavinmc42]

Just a small local area or an entire island?

RTK GPS.
This uses a reference GPS basestation and compares it with a GPS unit on the spot to be measured.
Same system is used for GPS auto steer tractors etc. Good for cm type accuracy.
You would need to monitor movement over a long period of time.
If the land is sinking 1cm per hour/day, you won't have time to do much.

Only works if your basestation is not sinking too.
https://pixhawk.org/dev/rtk-basestation
viewtopic.php?f=93&t=80436
http://www.instructables.com/id/Sub-Cen ... th-RTKLIB/
https://drfasching.com/products/gnss/raspignss.html

Could use lasers?
Microwave radar is used for mining, to detect cliff face movement.

[peterlite]

Your reading device could also sink into the soil. If your reader blocks sunlight, the plants die, organic matter disappears, and the topsoil sinks. The topsoil compresses when you block rain. A target along the lines of an old concrete floor slab might have finished sinking through the topsoil.

Mexico City has houses several stories deep because of all the water pumped out of the soil. Some places are sinking at 200mm per year.

[PiGraham]

Hi, i was workign on a project that measure the land level if it is sinking. Is there any additional hardware do i need to this this thing?

Sinking by how much relative to what?

Obviously you do need additional hardware, a land level measuring device, whatever that is.