An internal utility function to find the grid line intersections of a line segment

find_intersections(
  geolocation,
  x_grid,
  y_grid,
  latitude,
  longitude,
  first_point = FALSE
)

Arguments

geolocation: Two-row latitude/longitude table defining the line segment to trace.
x_grid: Grid of cell-corner longitudes.
y_grid: Grid of cell-corner latitudes.
latitude: Cell-centre latitude grid.
longitude: Cell-centre longitude grid.
first_point: Logical; if `TRUE`, include the starting point of the transect in the returned intersection set.