This function selects an IRS of a finite resource (discrete points).
irspts(ptsframe, samplesize = 100, SiteBegin = 1)
Data frame containing id, x, y, mdcaty, and mdm.
Number of points to select in the sample. The default is 100.
First number to start siteID numbering. The default is 1.
Data frame of sample points containing: siteID, id, x, y, mdcaty, and weight.