bboxsf <- make_bbox(SFstations$longitude, SFstations$latitude, f = .05)
mapsfscale <- get_map(bboxsf)
SFmapscale <- ggmap(mapsfscale) + geom_point(data = SFstations, aes(x =SFstations$longitude, y= SFstations$latitude, size=Freq), alpha =1.0) + geom_text(aes(label = SFstations$name),vjust=0, hjust= 0)
这是我上面的代码。我设法根据频率在地图上缩放我的点数。当我尝试添加标签时，虽然我收到错误
Aesthetics must be either length 1 or the same as the data (4): label, x, y.