我有一个数据帧与Lat Lon mean_wind和wind_dir 在每个网格单元.我试图用背景和风向上的平均风作为每个网格单元格上的箭头制作空间图.
我试过跟踪样本数据框架 wind.dt
win.plt<- ggplot(wind.dt,aes(x=Lon,y=Lat))+
#Mean wind plot : OK
geom_tile(aes(fill=mean_wind),alpha=1)+
geom_tile(aes(color=mean_wind), fill=NA) +
scale_fill_gradientn(colours=(brewer.pal(9,rev("RdYlGn"))))+
scale_color_gradientn(colours=(brewer.pal(9,rev("RdYlGn"))),guide=F)
#Wind Direction : doesnot work
geom_segment(arrow = arrow(),aes(yend = Lon + wind_dir, xend = Lat + wind_dir))
win.plt
wind.dt<-structure(list(Lon = c(170.25, 171, 171.75, 172.5, 173.25, 174,
174.75, 175.5, 176.25, 177, 177.75, 178.5, 179.25, 180, 180.75,
181.5, 182.25, 183, 183.75, 184.5, 185.25, 186, 186.75, 187.5,
188.25, 189, 189.75, 190.5, 191.25, 192, 192.75, 193.5, 194.25,
170.25, 171, 171.75, 172.5, 173.25, …