extractPolyData: Extract PolyData from a PolySet

In PBSmapping: Mapping Fisheries Data and Spatial Analysis Tools

Extract PolyData from a PolySet

Description

Extract PolyData from a PolySet. Columns for the PolyData include those other than PID, SID, POS, oldPOS, X, and Y.

Usage

extractPolyData (polys)

Arguments

polys

PolySet to use.

Details

This function identifies the PolySet's extra columns and determines if those columns contain unique values for each (PID, SID). Where they do, the (PID, SID) will appear in the PolyData output with that unique value. Where they do not, the extra column will contain NAs for that (PID, SID).

Value

PolyData with columns PID, SID, and any extra columns.

Author(s)

Nicholas M. Boers, Staff Software Engineer
Jobber, Edmonton AB
Last modified Rd: 2013-04-10

See Also

makeProps, PolyData, PolySet.

Examples

local(envir=.PBSmapEnv,expr={
  #--- create a PolySet with an extra column
  polys <- data.frame(PID = c(rep(1, 10), rep(2, 10)),
    POS = c(1:10, 1:10),
    X = c(rep(1, 10), rep(1, 10)),
    Y = c(rep(1, 10), rep(1, 10)),
    colour = (c(rep("green", 10), rep("red", 10))))
  #--- extract the PolyData
  print(extractPolyData(polys))
})

PBSmapping documentation built on Nov. 4, 2023, 9:08 a.m.