Given a data object and lng/lat arguments (which may be NULL [meaning infer from data], formula [which should be evaluated with respect to the data], or vector data [which should be used as-is]) return a spatial object
derivePolygons(data, lng = NULL, lat = NULL,
missingLng = missing(lng), missingLat = missing(lat),
funcName = "f")
map data
longitude
latitude
whether lng is missing
whether lat is missing
Name of calling function (for logging)