Two part system (3 with UAV) - deploy platform with 5 "spikes"
Each spike can have different application
-ultra low power electronics (i.e. TI MSP430 - uA range)
-solar/thermoelectric (ground-air temperature cycle) power generator, 18650/Ultracap power storage
-low power sensors for UV radiation, air/soil ph/pollutants
-seeds deployment on hard to reach places/terrain (steep mountain hillside,your neighbor roof)
/Ellen Ripley surprise mode
-introduction of pests natural predators (aphids versus ladybird)
-pests pheromone adhesive traps
/Terrain survey mode
-stereo mode photogrametry with two modified action cameras in IR/Vis mode for recognition useful plants from weeds
-structure from motion terrain map for better farming
-beacon deployment for marking future fertilizer spots
equinitry, thanks for comments.I chose cone shape for simplicity, with center of mass in lower end and 20m drop, it should do the job on moderate hard ground.Solar is the way to go, as it is cheap, durable(with a bit of clear epoxy) and fairy predictable with power output.Maybe I add a few on sides to get at least some power when deployment goes in fugazi mode.
For this one, grid shape will change, but it will be definitely grids.Weight/material reduction,automatic opening,space savings and this spaceX/soviet missile scent ;)
For comms LoRa and mesh networking is the way in my opinion, gps goes out because you have one on drone, is power hungry and you know where you made the drop from logs.
Thermoelectric I have in mind for very simple sensor that stays for looong time.Minimal power,slow brusts of data. Space blanket with Peltier and simple pcb. It works on Antarctida, we will see how well it goes on 50degN :)
Geophone is interesting thought, but it feels like order of magnitude smaller that already weak TE.I will look into it.