> On Jan 21, 2020, at 12:04 AM, Martin Koppenhoefer <dieterdre...@gmail.com> 
> wrote:
> if the sheets are the topmost thing before the air of the atmosphere, surface 
> would be fine

as an FYI, I am only interested in mapping any of these types of things if they 
are clearly visible all the time and installed permanently (present year to 
year), as they are a visible. somethign that would go in the surface= tag. 

Most farming plastic (like the ones used to grow vegetables) is not mappable, 
as it is only present 3 months of the year and is constantly changing location 
in a farm field year to year. 

Similarly, if a soil stabilizer / sheeting / plastic  is permanently visible on 
the surface it should be mapped as a surface, but if it is buried and not 
visible - like most landscaping paper buried in the ground -  then it should 
rightly be ignored. 

if someone wants to come up with an embankment:stabilized=mesh (or whatever) 
tag for known stabilized slopes, thats fine with me, but I am not pursuing 

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