Identify GAT Boundary

This function opens a dialog window for the user to select a character variable to prioritize larger geographic areas such as counties in which to aggregate. The dialog window looks like this.

Figure: Dialog to select your boundary variable

Select your desired boundary variable. If you do not want to include a boundary, select "NONE". If you want to enforce the boundary, check the box on the right as shown. Then click on one of the following buttons.

• Click Next to continue to the next step.

• Click Cancel to end GAT.

• Click Back to return to the previous step.

• Click Help to get further guidance and open this manual.

identifyGATboundary(
  shp,
  step = 3,
  boundary = "NONE",
  myvar = "NONE",
  borders = FALSE,
  check = FALSE,
  backopt = TRUE
)

Arguments

shp

Spatial layer.

step

Integer step in GAT, for help reference.

boundary

Boundary variable, if pre-selected. Defaults to "NONE", which means no boundary selected.

myvar

Boundary variable, if pre-selected.

borders

Boolean denoting whether to enforce boundary. Default is FALSE.

check

Checkbox setting, if pre-selected. Currently does not do anything.

backopt

Boolean denoting whether to include the back button.

Details

This function reads in a dataset and extracts the names of variables that are (1) character and (2) not unique, since only these variables will be suitable for defining larger geographic areas in GAT.

Examples

if (interactive()) {
# select boundary variable
identifyGATboundary(shp = hftown)
}
#> $myvar
#> [1] "cancel"
#> 
#> $check
#> [1] FALSE
#> 
#> $threshold
#> [1] 0
#>