grid_location {SpatialGEV}

Grid the locations with fixed cell size

Description

Grid the locations with fixed cell size

Usage

grid_location(
  lon,
  lat,
  sp.resolution = 2,
  lon.range = range(lon),
  lat.range = range(lat)
)

Arguments

lon

Numeric, n longitude values

lat

Numeric, n latitude values

sp.resolution

Numeric, must be a single value that indicates the minimal unit length of a grid cell.

lon.range

Optional vector that indicates the range of lon. Default is range(lon).

lat.range

Optional vector that indicates the range of lat. Default is range(lat).

Details

The longitude and latitude of each grid cell are the coordinate of the cell center. For example, if sp.resolution=1, then cell_lon=55.5 and cell_lat=22.5 correspond to the square whose left boundary is 55, right boundary is 56, upper boundary is 23, and lower boundary is 22.

Value

An ⁠n x 3⁠ data frame containing three variables: cell_ind corresponds to unique id for each grid cell, cell_lon is the longitude of the grid cell, cell_lat is the latitude of the grid cell. Since the output data frame retains the order of the input coordinates, the original coordinate dataset and the output have can be linked one-to-one by the row index.

Examples

longitude <- runif(20, -90, 80)
latitude <- runif(20, 40, 60)
grid_locs <- grid_location(longitude, latitude, sp.resolution=0.5)
cbind(longitude, latitude, grid_locs)