Usage
grtspts(src.frame="shapefile", shapefilename=NULL, ptsframe, samplesize=100, SiteBegin=1, shift.grid=TRUE, do.sample=TRUE, startlev=NULL, maxlev=11)
Arguments
src.frame
source of the frame, which equals "shapefile" if the frame is
to be read from a shapefile, or "att.frame" if the frame is included in
ptsframe. The default is "shapefile".
shapefilename
name of the input shapefile. If src.frame equal
"shapefile" and shapefilename equals NULL, then the shapefile or shapefiles
in the working directory are used. The default is NULL.
ptsframe
a data frame containing id, x, y, mdcaty, and mdm.
samplesize
number of points to select in the sample. The default is
100.
SiteBegin
number to use for first site in the design. The default is
1.
shift.grid
option to randomly shift the hierarchical grid, where TRUE
means shift the grid and FALSE means do not shift the grid, which is
useful if one desires strict spatial stratification by hierarchical grid
cells. The default is TRUE.
do.sample
option to select a sample, where TRUE means select a sample
and FALSE means return the entire sample frame in reverse hierarchical
order. The default is TRUE.
startlev
initial number of hierarchical levels to use for the GRTS
grid, which must be less than or equal to maxlev (if maxlev is specified)
and cannot be greater than 11. The default is NULL.
maxlev
maximum number of hierarchical levels to use for the GRTS grid,
which cannot be greater than 11. The default is 11.