degAxis {sp}

axis with degrees

Description

draw axes on a plot using degree symbols in numbers

Usage

degAxis(side, at, labels, ...)

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

...

passed to the actual axis call

Value

axis is plotted on current graph

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(SpatialPoints(xy, proj4string = CRS("+proj=longlat +ellps=WGS84")),xlim=c(-1,1),ylim=c(-1,1))
degAxis(1)
degAxis(2, at = c(-1,-0.5,0,0.5,1))
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