xy2FIApoly: convert xy coordinates to fia plots

In jstrunk001/RSForInvt: Remote Sensing FORest INVenTory related analysis tasks, especially FUSION, lidR, NVEL

convert xy coordinates to fia plots

Description

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

This program is free software but it is provided WITHOUT WARRANTY and with ABSOLUTELY NO GUARANTEE of fitness or functionality for any purpose; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

Usage

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

Arguments

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

Details

<Delete and Replace>

Revision History

1.0	date and revisions..

Value

<Delete and Replace>

Author(s)

Jacob Strunk <[e-mail]>

See Also

bbox2polys

Examples

   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)

jstrunk001/RSForInvt documentation built on April 18, 2022, 11:03 p.m.