s2dverification (version 2.8.6)

PlotEquiMap: Maps A Two-Dimensional Variable On A Cylindrical Equidistant Projection

Description

Map longitude-latitude array (on a regular rectangular or gaussian grid) on a cylindrical equidistant latitude and longitude projection with coloured grid cells. Only the region for which data has been provided is displayed. A colour bar (legend) can be plotted and adjusted. It is possible to draw superimposed arrows, dots, symbols, contour lines and boxes. A number of options is provided to adjust the position, size and colour of the components. This plot function is compatible with figure layouts if colour bar is disabled.

Usage

PlotEquiMap(var, lon, lat, varu = NULL, varv = NULL, toptitle = NULL,
  sizetit = NULL, units = NULL, brks = NULL, cols = NULL,
  bar_limits = NULL, triangle_ends = NULL, col_inf = NULL,
  col_sup = NULL, colNA = NULL, color_fun = clim.palette(),
  square = TRUE, filled.continents = NULL, coast_color = NULL,
  coast_width = 1, contours = NULL, brks2 = NULL, contour_lwd = 0.5,
  contour_color = "black", contour_lty = 1, contour_label_scale = 1,
  dots = NULL, dot_symbol = 4, dot_size = 1,
  arr_subsamp = floor(length(lon)/30), arr_scale = 1, arr_ref_len = 15,
  arr_units = "m/s", arr_scale_shaft = 1, arr_scale_shaft_angle = 1,
  axelab = TRUE, labW = FALSE, intylat = 20, intxlon = 20,
  axes_tick_scale = 1, axes_label_scale = 1, drawleg = TRUE,
  subsampleg = NULL, bar_extra_labels = NULL, draw_bar_ticks = TRUE,
  draw_separators = FALSE, triangle_ends_scale = 1, bar_label_digits = 4,
  bar_label_scale = 1, units_scale = 1, bar_tick_scale = 1,
  bar_extra_margin = rep(0, 4), boxlim = NULL, boxcol = "purple2",
  boxlwd = 5, margin_scale = rep(1, 4), title_scale = 1, numbfig = NULL,
  fileout = NULL, width = 8, height = 5, size_units = "in", res = 100,
  ...)

Arguments

var

Array with the values at each cell of a grid on a regular rectangular or gaussian grid. The array is expected to have two dimensions: c(latitude, longitude). Longitudes can be in ascending or descending order and latitudes in any order. It can contain NA values (coloured with 'colNA'). Arrays with dimensions c(longitude, latitude) will also be accepted but 'lon' and 'lat' will be used to disambiguate so this alternative is not appropriate for square arrays.

lon

Numeric vector of longitude locations of the cell centers of the grid of 'var', in ascending or descending order (same as 'var'). Expected to be regularly spaced, within either of the ranges [-180, 180] or [0, 360]. Data for two adjacent regions split by the limits of the longitude range can also be provided, e.g. lon = c(0:50, 300:360) ('var' must be provided consitently).

lat

Numeric vector of latitude locations of the cell centers of the grid of 'var', in any order (same as 'var'). Expected to be from a regular rectangular or gaussian grid, within the range [-90, 90].

varu

Array of the zonal component of wind/current/other field with the same dimensions as 'var'.

varv

Array of the meridional component of wind/current/other field with the same dimensions as 'var'.

toptitle

Top title of the figure, scalable with parameter 'title_scale'.

sizetit

Scale factor for the figure top title provided in parameter 'toptitle'. Deprecated. Use 'title_scale' instead.

units

Title at the top of the colour bar, most commonly the units of the variable provided in parameter 'var'.

brks, cols, bar_limits, triangle_ends

Usually only providing 'brks' is enough to generate the desired colour bar. These parameters allow to define n breaks that define n - 1 intervals to classify each of the values in 'var'. The corresponding grid cell of a given value in 'var' will be coloured in function of the interval it belongs to. These parameters are sent to ColorBar() to generate the breaks and colours. Additional colours for values beyond the limits of the colour bar are also generated and applied to the plot if 'bar_limits' or 'brks' and 'triangle_ends' are properly provided to do so. See ?ColorBar for a full explanation.

col_inf, col_sup, colNA

Colour identifiers to colour the values in 'var' that go beyond the extremes of the colour bar and to colour NA values, respectively. 'colNA' takes attr(cols, 'na_color') if available by default, where cols is the parameter 'cols' if provided or the vector of colors returned by 'color_fun'. If not available, it takes 'pink' by default. 'col_inf' and 'col_sup' will take the value of 'colNA' if not specified. See ?ColorBar for a full explanation on 'col_inf' and 'col_sup'.

color_fun, subsampleg, bar_extra_labels, draw_bar_ticks, draw_separators, triangle_ends_scale, bar_label_digits, bar_label_scale, units_scale, bar_tick_scale, bar_extra_margin

Set of parameters to control the visual aspect of the drawn colour bar. See ?ColorBar for a full explanation.

square

Logical value to choose either to draw a coloured square for each grid cell in 'var' (TRUE; default) or to draw contour lines and fill the spaces in between with colours (FALSE). In the latter case, 'filled.continents' will take the value FALSE if not specified.

filled.continents

Colour to fill in drawn projected continents. Takes the value gray(0.5) by default or, if 'square = FALSE', takes the value FALSE. If set to FALSE, continents are not filled in.

coast_color

Colour of the coast line of the drawn projected continents. Takes the value gray(0.5) by default.

coast_width

Line width of the coast line of the drawn projected continents. Takes the value 1 by default.

contours

Array of same dimensions as 'var' to be added to the plot and displayed with contours. Parameter 'brks2' is required to define the magnitude breaks for each contour curve. Disregarded if 'square = FALSE'.

brks2

Vector of magnitude breaks where to draw contour curves for the array provided in 'contours' or if 'square = FALSE'.

contour_lwd

Line width of the contour curves provided via 'contours' and 'brks2', or if 'square = FALSE'.

contour_color

Line color of the contour curves provided via 'contours' and 'brks2', or if 'square = FALSE'.

contour_lty

Line type of the contour curves. Takes 1 (solid) by default. See help on 'lty' in par() for other accepted values.

contour_label_scale

Scale factor for the superimposed labels when drawing contour levels.

dots

Array of same dimensions as 'var' or with dimensions c(n, dim(var)), where n is the number of dot/symbol layers to add to the plot. A value of TRUE at a grid cell will draw a dot/symbol on the corresponding square of the plot. By default all layers provided in 'dots' are plotted with dots, but a symbol can be specified for each of the layers via the parameter 'dot_symbol'.

dot_symbol

Single character/number or vector of characters/numbers that correspond to each of the symbol layers specified in parameter 'dots'. If a single value is specified, it will be applied to all the layers in 'dots'. Takes 15 (centered square) by default. See 'pch' in par() for additional accepted options.

dot_size

Scale factor for the dots/symbols to be plotted, specified in 'dots'. If a single value is specified, it will be applied to all layers in 'dots'. Takes 1 by default.

arr_subsamp

Subsampling factor to select a subset of arrows in 'varu' and 'varv' to be drawn. Only one out of arr_subsamp arrows will be drawn. Takes 1 by default.

arr_scale

Scale factor for drawn arrows from 'varu' and 'varv'. Takes 1 by default.

arr_ref_len

Length of the refence arrow to be drawn as legend at the bottom of the figure (in same units as 'varu' and 'varv', only affects the legend for the wind or variable in these arrays). Defaults to 15.

arr_units

Units of 'varu' and 'varv', to be drawn in the legend. Takes 'm/s' by default.

arr_scale_shaft

Parameter for the scale of the shaft of the arrows (which also depend on the number of figures and the arr_scale parameter). Defaults to 1.

arr_scale_shaft_angle

Parameter for the scale of the angle of the shaft of the arrows (which also depend on the number of figure and the arr_scale parameter). Defaults to 1.

axelab

Whether to draw longitude and latitude axes or not. TRUE by default.

labW

Whether to label the longitude axis with a 'W' instead of minus for negative values. Defaults to FALSE.

intylat

Interval between latitude ticks on y-axis, in degrees. Defaults to 20.

intxlon

Interval between latitude ticks on x-axis, in degrees. Defaults to 20.

axes_tick_scale

Scale factor for the tick lines along the longitude and latitude axes.

axes_label_scale

Scale factor for the labels along the longitude and latitude axes.

drawleg

Whether to plot a color bar (legend, key) or not. Defaults to TRUE. It is not possible to plot the colour bar if 'add = TRUE'. Use ColorBar() and the return values of PlotEquiMap() instead.

boxlim

Limits of a box to be added to the plot, in degrees: c(x1, y1, x2, y2). A list with multiple box specifications can also be provided.

boxcol

Colour of the box lines. A vector with a colour for each of the boxes is also accepted. Defaults to 'purple2'.

boxlwd

Line width of the box lines. A vector with a line width for each of the boxes is also accepted. Defaults to 5.

margin_scale

Scale factor for the margins around the map plot, with the format c(y1, x1, y2, x2). Defaults to rep(1, 4). If drawleg = TRUE, then margin_scale[1] is subtracted 1 unit.

title_scale

Scale factor for the figure top title. Defaults to 1.

numbfig

Number of figures in the layout the plot will be put into. A higher numbfig will result in narrower margins and smaller labels, axe labels, ticks, thinner lines, ... Defaults to 1.

fileout

File where to save the plot. If not specified (default) a graphics device will pop up. Extensions allowed: eps/ps, jpeg, png, pdf, bmp and tiff.

width

File width, in the units specified in the parameter size_units (inches by default). Takes 8 by default.

height

File height, in the units specified in the parameter size_units (inches by default). Takes 5 by default.

size_units

Units of the size of the device (file or window) to plot in. Inches ('in') by default. See ?Devices and the creator function of the corresponding device.

res

Resolution of the device (file or window) to plot in. See ?Devices and the creator function of the corresponding device.

Arguments to be passed to the method. Only accepts the following graphical parameters: adj ann ask bg bty cex.sub cin col.axis col.lab col.main col.sub cra crt csi cxy err family fg font font.axis font.lab font.main font.sub lend lheight ljoin lmitre mex mfcol mfrow mfg mkh omd omi page pch pin plt pty smo srt tcl usr xaxp xaxs xaxt xlog xpd yaxp yaxs yaxt ylbias ylog For more information about the parameters see `par`.

Value

brks

Breaks used for colouring the map (and legend if drawleg = TRUE).

cols

Colours used for colouring the map (and legend if drawleg = TRUE). Always of length length(brks) - 1.

col_inf

Colour used to draw the lower triangle end in the colour bar (NULL if not drawn at all).

col_sup

Colour used to draw the upper triangle end in the colour bar (NULL if not drawn at all).

Examples

Run this code
# NOT RUN {
# See examples on Load() to understand the first lines in this example
 
# }
# NOT RUN {
data_path <- system.file('sample_data', package = 's2dverification')
expA <- list(name = 'experiment', path = file.path(data_path,
            'model/$EXP_NAME$/$STORE_FREQ$_mean/$VAR_NAME$_3hourly',
            '$VAR_NAME$_$START_DATE$.nc'))
obsX <- list(name = 'observation', path = file.path(data_path,
            '$OBS_NAME$/$STORE_FREQ$_mean/$VAR_NAME$',
            '$VAR_NAME$_$YEAR$$MONTH$.nc'))

# Now we are ready to use Load().
startDates <- c('19851101', '19901101', '19951101', '20001101', '20051101')
sampleData <- Load('tos', list(expA), list(obsX), startDates,
                  leadtimemin = 1, leadtimemax = 4, output = 'lonlat',
                  latmin = 27, latmax = 48, lonmin = -12, lonmax = 40)
 
# }
# NOT RUN {
 
# }
# NOT RUN {
PlotEquiMap(sampleData$mod[1, 1, 1, 1, , ], sampleData$lon, sampleData$lat, 
           toptitle = 'Predicted sea surface temperature for Nov 1960 from 1st Nov',
           sizetit = 0.5)
# }

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