Detect Current Biome for Character?

[AutumnPingo]

I have a character who should get a speed boost while in swamps, while probably getting nerfed in other biomes as well. I know how to actually alter the movespeed, but I've searched all up and down the internet for any clues on biome checking. I could only find day,night based code. Thanks for any help.

Edited June 1, 2018 by AutumnPingo

[K1NGT1GER609]

Here:

local function groundcheckfn(inst)
local tile = TheWorld.Map:GetTileAtPoint(inst.Transform:GetWorldPosition())
    if tile == GROUND.MARSH then
    inst.components.locomotor.walkspeed = 8 --higher speed
    inst.components.locomotor.runspeed = 10
    else
    inst.components.locomotor.walkspeed = 4 --regular speed
    inst.components.locomotor.runspeed = 6
    end
end

inst:DoPeriodicTask(1, groundcheckfn, nil, inst)

all this goes into the master_postinit and the last part of code goes near the onload code. Can't take much credit besides modifying the code from @ksaab and @SuperDavid  a bit back ago.

[AutumnPingo]

Wow thanks! Works right out of the box! You said you got this from somewhere else? Darn, I spent half a whole day looking for even a clue where to start, thanks so much!