This function selects an independent random sample (IRS) of a finite resource.
irspts(ptsframe, samplesize=100, SiteBegin=1)
a data frame containing id, x, y, mdcaty, and mdm.
number of points to select in the sample. The default is 100.
number to use for first site in the design. The default is 1.
A data frame of IRS sample points containing: SiteID, id, x, y, mdcaty, and weight.