SPADAR (version 1.0)

createAllSkyGridChart:

Description

A function to create all-sky charts with gridlines of one or more astronomical coordinate systems.

The function can create gridlines for the equatorial, ecliptic or galactic coordinate systems. Any spherical projection supported by the mapproj package is supported (but only the Aitoff, Mollweide and Mercator projections routinely are tested).

Usage

createAllSkyGridChart(longitude = c(0, 45, 90, 135, 180, 225, 270, 315, 360), 
latitude = c(-75, -60, -45, -30, -15, 0, 15, 30, 45, 60, 75), mainGrid = "equatorial", 
eqCol = "red", eclCol = "blue", galCol = "green", eqLty = 1, eclLty = 2, galLty = 3, 
eqLwd = 1, eclLwd = 1, galLwd = 1, eqDraw = TRUE, eclDraw = TRUE, galDraq = TRUE, 
projname = "aitoff", projparam = NULL, projorient = NULL, npoints = 50, 
overplot = FALSE, addLab = TRUE, label.cex = 0.6, 
main = paste("All-Sky Grid (", projname, ")", sep = ""), ...)

Arguments

longitude

A vector with the positions of the first coordinate lines in degrees (Right Ascention, for data in the Equatorial system, Ecliptic Longitude for the Ecliptic system or Galactic Longitude for the Galactic System).

latitude

A vector with the positions of the second coordinate lines in degrees (Declination, for data in the Equatorial system, Ecliptic Latitude for the Ecliptic system or Galactic Latitude for the Galactic System).

mainGrid

String. The main coordinate system of the plot. It can take the following values: "equatorial", "ecliptic" or "galactic". It defaults to "equatorial".

eqCol

String. The color of the Equatorial coordinate system lines.

eclCol

String. The color of the Ecliptic coordinate system lines.

galCol

String. The color of the Galactic coordinate system lines.

eqLty

Numeric. The line type of the Equatorial coordinate system lines.

eclLty

Numeric. The line type of the Ecliptic coordinate system lines.

galLty

Numeric. The line type of the Galactic coordinate system lines.

eqLwd

Numeric. The line width of the Equatorial coordinate system lines.

eclLwd

Numeric. The line width of the Ecliptic coordinate system lines.

galLwd

Numeric. The line width of the Galactic coordinate system lines.

eqDraw

Logical. A boolean to indicate if the Equatorial coordinate system lines should be draw.

eclDraw

Logical. A boolean to indicate if the Ecliptic coordinate system lines should be draw.

galDraq

Logical. A boolean to indicate if the Galactic coordinate system lines should be draw.

projname

String. The spherical projection of the plot. It can take as argument any projection supported by the mapproj package, but only "aitoff", "mollweide" and "mercator" are tested automatically. It defaults to "aitoff".

projparam

Parameters to configure the projection. It defaults to NULL.

projorient

The orientation of the projection. It defaults to NULL.

npoints

Numeric. The number of points used to draw each grid line. Defaults to 50.

overplot

Logical. A boolean to indicate if the grid should be overploted or a new plot should be created.

addLab

Logical. A boolean to indicate if the labels should be added.

label.cex

Numeric. The size of the labels.

main

String. The main title of the plot.

…

Additional parameters to be passed to lines.

See Also

createAllSkyScatterPlotChart, overplotScatterPlotInAllSkyGridChart, lines, mapproject.

Examples

# Creates an all sky chart with Equatorial, Ecliptic and Galactic coordinate systems superposed, 
# with the Equatorial as the main system in black, the Ecliptic in blue with 0.5 transparency and 
# dashed lines and the Galactic in red with 0.5 transparency and dashed lines
createAllSkyGridChart(mainGrid="equatorial", eqDraw=TRUE, eclDraw=TRUE, galDraq=TRUE, 
  eqCol="black", eclCol=rgb(0,0,1,0.5), galCol=rgb(1,0,0,0.5), eqLty=1, eclLty=2, galLty=2)

# Equatorial and Galactic coordinate systems represented in a polyconic projection
createAllSkyGridChart(mainGrid="equatorial", eqDraw=TRUE, eclDraw=FALSE, galDraq=TRUE, 
  eqCol="black", galCol=rgb(1,0,0,0.5), eqLty=1, galLty=2, projname="polyconic")

# The same as above, but in non-standard Aitoff projection with the South Pole 
# in the center og the projection
createAllSkyGridChart(mainGrid="equatorial", eqDraw=TRUE, eclDraw=TRUE, galDraq=TRUE, 
  eqCol="black", eclCol=rgb(0,0,1,0.5), galCol=rgb(1,0,0,0.5), eqLty=1, eclLty=2, 
  galLty=2, projname="aitoff", projorient=c(0,0,0))