addBullseye: Add a Bullseyes to a Map or RgoogleMap Plot
In PWFSLSmoke: Utilities for Working with Air Quality Monitoring Data

Draws a bullseye with concentric circles of black and white at the specified location.

1	addBullseye(longitude, latitude, map = NULL, cex = 2, lwd = 2)

`longitude`	vector of longitudes
`latitude`	vector of latitudes
`map`	optional RgoogleMaps map object
`cex`	character expansion
`lwd`	line width of individual circles

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wa <- monitor_subset(Northwest_Megafires, stateCodes='WA', tlim=c(20150821,20150828))
monitor_map(wa, cex=4)
addBullseye(wa$meta$longitude, wa$meta$latitude)