vec: Draw vectors on maps for esd objects

In metno/esd: Climate analysis and empirical-statistical downscaling (ESD) package for monthly and daily data

Draw vectors on maps for esd objects

Description

Plot arrows for e.g. a wind field or ocean currents.

Usage

vec(
  x,
  y,
  it = NULL,
  a = NULL,
  r = 1,
  ix = NULL,
  iy = NULL,
  new = TRUE,
  nx = 150,
  ny = 80,
  projection = "lonlat",
  lonR = NULL,
  latR = NULL,
  axiR = 0,
  verbose = FALSE,
  length = NULL,
  ...
)

Arguments

x	the zonal comonents of the vectors
y	the meridional comonents of the vectors
it	see subset
a	used to scale the length of the arrows
r	used to make a 3D effect of plotting the arrows up in the air.
new	TRUE: create a new graphic device.
nx	is the number of vectors/points along the x-axis
ny	is the number of vectors/points along the y-axis
projection	Projections: c("lonlat","sphere","np","sp") - the latter gives stereographic views from the North and south poles.
lonR	Only for the spherical projection
latR	Only for the spherical projection
axiR	Only for the spherical projection
xlim	see plot - only used for 'lonlat' and 'sphere' projections.
ylim	see plot - only used for 'lonlat' and 'sphere' projections.
n	The number of colour breaks in the color bar
breaks	graphics setting - see image
type	graphics setting - colour shading or contour
gridlines	Only for the lon-lat projection
is	see subset

See Also

map

Examples

## Not run: 
sst <- sst.NCEP()
download.file('ftp://ftp.cdc.noaa.gov/Datasets/ncep.reanalysis.derived/surface/uwnd.mon.mean.nc','ncep_u.nc')
download.file('ftp://ftp.cdc.noaa.gov/Datasets/ncep.reanalysis.derived/surface/vwnd.mon.mean.nc','ncep_v.nc')
u <- retrieve('ncep_u.nc')
v <- retrieve('ncep_v.nc')
## Make a map of SSt and wind vectors:
map(sst)
vec(u,v,a=1.5,length=0.03,new=FALSE)

## Make a fancy map
map(sst,projection='sphere')
vec(u,v,a=0.5,r=1.1,length=0.03,projection='sphere',new=FALSE)

## End(Not run)

metno/esd documentation built on April 29, 2024, 3:34 p.m.