xy2FIApoly: convert xy coordinates to fia plots
In jstrunk001/lasR: Simple lidar reading, processing, viewing

Description Usage Arguments Details Value Author(s) See Also Examples

supply fia plot centers, and have have Spatial Polygons Dataframe returned, where each record is an FIA plot footprint: 4 fixed area subplots of 24 foot radius, a central subplot and 3 peripheral subplots 120 feet from plot center at 0,120,240 degrees.

Ignores declination - assumes everything faces projected north

1 2	xy2FIApoly(idxy, names = c(plot = "plot", x = "x", y = "y"), create_polys = T)

`idxy`	dataframe with id, x, y columns available
`names`	link dataframe columns to variable names used by funciton
`create_polys`	TRUE / FALSE

Revision History

1.0	date and revisions..

Jacob Strunk <Jstrunk@fs.fed.us>

bbox2polys

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   res=xy2FIAplot(data.frame(plot=1:10, x=101:110*10000, y=101:110*10000),create_polys=T)
   spplot(res[1,],zcol=1,aspect=1,scales=list(draw=T),key.space=list(x=0.2,y=0.9,corner=c(0,1)))
   spplot(res)