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Last data update: 2014.03.03

R: Find point pairs with equal spatial coordinates from STFDF...

rm.dupl

R Documentation

Find point pairs with equal spatial coordinates from STFDF object.

Description

This function finds point pairs with equal spatial coordinates from STFDF object and remove locations with less observations.

Usage

rm.dupl(obj, zcol = 1, zero.tol = 0)

Arguments

`obj`	STFDF object
`zcol`	variable column name, or column number, from obj@data
`zero.tol`	distance values less than or equal to this threshold value are considered as duplicates; units are those of the coordinates for projected data or unknown projection, or km if coordinates are defined to be longitute/latitude

Value

STFDF object with removed duplicate locations. Stations with less observation is removed, if number of observation is the same for two stations the first is removed.

Author(s)

Milan Kilibarda kili@grf.bg.ac.rs

Examples

# load observation - data frame
data(dtempc) 
# load stations - data frame
data(stations)

str(dtempc)
str(stations)
# create STFDF
temp <- meteo2STFDF(dtempc,stations) # create STFDF from 2 data frames

nrow(temp@sp) # number of stations before removing dupl.

temp2 <-rm.dupl(temp)
nrow(temp2@sp) # number of stations after