Filter positions by an area.

Filters out positions lying inside or outside an area. The area can be defined in two ways, either by its X and Y coordinate ranges, or by an sf-*POLYGON object. MULTIPOLYGON objects are supported by the internal function atl_within_polygon.

atl_filter_bounds(
  data,
  x = "x",
  y = "y",
  x_range = NA,
  y_range = NA,
  sf_polygon = NULL,
  remove_inside = TRUE
)

Arguments

data	A dataframe or extension which contains X and Y coordinates.
x	The X coordinate column.
y	The Y coordinate column.
x_range	The range of X coordinates.
y_range	The range of Y coordinates.
sf_polygon	sfc_*POLYGON object which must have a defined CRS. The polygon CRS is assumed to be appropriate for the positions as well, and is assigned to the coordinates when determining the intersection.
remove_inside	Whether to remove points from within the range. Setting negate = TRUE removes positions within the bounding box specified by the X and Y ranges.

Value

A data frame of tracking locations with attractor points removed.

Author

Pratik R. Gupte

Examples

if (FALSE) {
filtered_data <- atl_filter_bounds(
  data = data,
  x = "X", y = "Y",
  x_range = c(x_min, x_max),
  y_range = c(y_min, y_max),
  sf_polygon = your_polygon,
  remove_inside = FALSE
)
}