convert objects into a stars object

st_as_stars(.x, ...)

# S3 method for list
st_as_stars(.x, ..., dimensions = NULL)

# S3 method for default
st_as_stars(.x = NULL, ..., raster = NULL)

# S3 method for stars
st_as_stars(.x, ..., curvilinear = NULL, crs = st_crs(4326))

# S3 method for bbox
st_as_stars(
  .x,
  ...,
  nx,
  ny,
  dx = dy,
  dy = dx,
  xlim = .x[c("xmin", "xmax")],
  ylim = .x[c("ymin", "ymax")],
  values = 0,
  n = 64800,
  pretty = FALSE,
  inside = FALSE
)

# S3 method for sf
st_as_stars(.x, ..., name = attr(.x, "sf_column"))

# S3 method for Raster
st_as_stars(.x, ...)

# S3 method for ncdfgeom
st_as_stars(.x, ..., sf_geometry = NA)

# S3 method for stars_proxy
st_as_stars(
  .x,
  ...,
  downsample = 0,
  url = attr(.x, "url"),
  envir = parent.frame()
)

# S3 method for xts
st_as_stars(.x, ..., dimensions)

# S3 method for OpenStreetMap
st_as_stars(.x, ..., as_col = FALSE)

Arguments

.x

object to convert

...

in case .x is of class bbox, arguments passed on to pretty

dimensions

object of class dimensions

raster

character; the names of the dimensions that denote raster dimensions

curvilinear

only for creating curvilinear grids: named length 2 list holding longitude and latitude matrices; the names of this list should correspond to raster dimensions to be replaced

crs

object of class crs with the coordinate reference system of the values in curvilinear; see details

nx

integer; number of cells in x direction; see details

ny

integer; number of cells in y direction; see details

dx

numeric; cell size in x direction; see details

dy

numeric; cell size in y direction; see details

xlim

length 2 numeric vector with extent (min, max) in x direction

ylim

length 2 numeric vector with extent (min, max) in y direction

values

value(s) to populate the raster values with

n

the (approximate) target number of grid cells

pretty

logical; should cell coordinates have pretty values?

inside

logical; should all cells entirely fall inside the bbox, potentially not covering it completely?

name

character; name for the geometry dimensions

sf_geometry

sf data.frame with geometry and attributes to be added to stars object. Must have same number of rows as timeseries instances.

downsample

integer: if larger than 0, downsample with this rate (number of pixels to skip in every row/column); if length 2, specifies downsampling rate in x and y.

url

character; URL of the stars endpoint where the data reside

envir

environment to resolve objects in

as_col

logical; return rgb numbers (FALSE) or (character) color values (TRUE)?

Details

if curvilinear is a stars object with longitude and latitude values, its coordinate reference system is typically not that of the latitude and longitude values.

For the bbox method: if pretty is TRUE, raster cells may extend the coordinate range of .x on all sides. If in addition to nx and ny, dx and dy are also missing, these are set to a single value computed as sqrt(diff(xlim)*diff(ylim)/n). If nx and ny are missing, they are computed as the ceiling of the ratio of the (x or y) range divided by (dx or dy), unless inside is TRUE, in which ceiling is replaced by floor. Postive dy will be made negative. Further named arguments (...) are passed on to pretty.

For the ncdfgeom method: objects are point-timeseries with optional line or polygon geometry for each timeseries specified with the sf_geometry parameter. See ncdfgeom for more about this NetCDF-based format for geometry and timeseries.

for the xts methods, if dimensions are provided, time has to be the first dimension.