Use the coordinates of the input raster to generate coordinate rasters, these are then used in a contour plot.
lonlat(
x,
na.rm = FALSE,
lon = FALSE,
lat = FALSE,
...,
plot = TRUE,
add = TRUE
)Arguments
- x
input raster
- na.rm
logical, remove missing values from generated coordinates
- lon
if TRUE, only longitude plotted
- lat
if TRUE (and `lon = FALSE`) only latitude plotted
- ...
passed to [graphics::contour()]
- plot
logical, plot the result
- add
logical, add to current plot or instantiate one
Value
RasterBrick of the longitude and latitude values, two layers
(invisibly) the raster (RasterBrick) object with longitude and latitude values of the input as two layers, otherwise this function used for side-effect (drawing on a plot)
Details
Plot is added to an existing plot by default.
Examples
plot(c(-180, 180), c(-90, 90))
lonlat(raster::raster())
p <- raster::projectExtent(raster::raster(), "+proj=igh")
lonlat(p, add = FALSE)
lonlat(p, levels = seq(-180, 180, by =15), add = FALSE)
lonlat(p, levels = seq(-180, 180, by = 5), add = FALSE, lon = TRUE)
lonlat(p, levels = seq(-180, 180, by = 15), add = TRUE, lat = TRUE)
