getPanel: Extract all points with a specified panel id from a sample.

In spbal: Spatially Balanced Sampling Algorithms

Extract all points with a specified panel id from a sample.

Description

This is the main function for selecting sites using the BAS master sample. It assumes that you have already defined the master sample using the BoundingBox() function or will be selecting a marine master sample site in BC.

Usage

getPanel(shapefile, panelid)

Arguments

shapefile	Shape file as a polygon (sp or sf) containing a sample that contains a feature column named panel_id.
panelid	The overlapped panel in the shapefile shp the user wants sample points from.

Value

The sample for the specified panel.

Author(s)

Phil Davies.

Examples

# Halton frame overlapping panel design showing use of getPanel.

# Use the North Carolina shapefile supplied in the sf R package.
shp_file <- sf::st_read(system.file("shape/nc.shp", package="sf"))
shp_gates <- shp_file[shp_file$NAME == "Gates",]

# Vertically aligned master sample bounding box.
bb <- spbal::BoundingBox(shapefile = shp_gates)

# Three panels, of 20 samples each.
panels <- c(20, 20, 20)

# second panel overlaps first panel by 5, and third panel
# overlaps second panel by 5.
panel_overlap <- c(0, 5, 5)

# generate the sample.
samp <- spbal::HaltonFrame(J = c(4, 3),
                           boundingbox = bb,
                           panels = panels,
                           panel_overlap = panel_overlap,
                           shapefile = shp_gates)

# get halton frame data from our sample.
samp3 <- samp$hf.pts.shp
samp3

panelid <- 1
olPanel_1 <- spbal::getPanel(samp3, panelid)

spbal documentation built on April 4, 2025, 2:05 a.m.