degreeAxis function

axis with degrees

add an axis with degree labels

degreeAxis(side, at = NULL, labels, MyMap, ...)

Arguments

• side: integer; see axis
• at: numeric; if missing, axTicks is called for nice values; see axis
• labels: character; if omitted labels are constructed with degree symbols, ending in N/S/E/W; in case of negative degrees, sign is reversed and S or W is added; see axis
• MyMap: optional map object to be passed
• ...: optional arguments to axis

Returns

axis is plotted on current graph

Author(s)

Markus Loecher

Note

decimal degrees are used if variation is small, instead of minutes and seconds

Examples

xy = cbind(x = 2 * runif(100) - 1, y = 2 * runif(100) - 1)
plot(xy,xlim=c(-1,1),ylim=c(-1,1))
degreeAxis(1)
degreeAxis(2, at = c(-1,-0.5,0,0.5,1))