This function selects an IRS of an area resource.
irsarea(areaframe, samplesize = 100, SiteBegin = 1)
The sf object containing attributes: id, mdcaty, area_mdm, and mdm.
Number of points to select in the sample. The default is 100.
First number to start siteID numbering. The default is 1.
An sf object of sample points containing attributes: siteID, id, mdcaty, and wgt.