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POggplot2 wind time series with arrows/vectors
 

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  1. POggplot2 wind time series with arrows/vectors
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    <p>From meteorological data (hourly values of temperature, wind and humidity) I managed to plot time series of wind speed and direction. Now I would like to add wind vectors on the time series plot. Here you can see the output I would like (arrows drawn over the actual plot).</p> <p><img src="https://i.stack.imgur.com/7lvPm.png" alt="enter image description here"></p> <p>I am using ggplot2, been looking through stackoverflow, ggplot2 package docs (will continue) but no solution found. Any idea or indication where to look would be a starting point.</p> <p>Thanks in advance</p> <p><strong>EDIT QUESTION</strong> As suggested in a comment by @slowlearner I add here code and data to make a reproducible example. It looks like geom_segment could do the trick. I managed to calculate yend in geom_segment but can't figure out how to find xend as x axis is a time axis. I've got wind speed and direction data so I can calculate x,y wind components for geom_segment but x needs to be converted to time format. </p> <p>Here is the code used for the plot (temperature) and <a href="http://ubuntuone.com/4Hb222VX1Scfv4TabqD8v5" rel="noreferrer">data</a> </p> <pre><code>for (i in 1:2 ) { rams=subset(data,data$stat_id %in% i) tore=subset(torre,torre$stat_id %in% i) # Gràfica en ggplot # Gráfica de evolución temporal de las estaciones de la zona gtitol=places$nom[places$stat_id == i] myplot=ggplot(data=rams,aes(x=datetime, y=tempc, colour="RAMS")) + geom_line() + ylab("Temperatura (ºC)") + xlab(" ") + ggtitle(gtitol) + theme(legend.title=element_blank()) + theme(legend.position="bottom") + scale_y_continuous(limits = c(0,40)) + geom_line(data=tore,aes(x=datetime,y=temp,colour = "Torre")) #scale_y_continuous(breaks = round(seq(min(data$tempc), max(data$tempc), by = 2),0)) ggsave(myplot,filename=paste("RAMS-",i,".png",sep=""),width=7.78,height=5.79) } </code></pre> <p>Following geom_segment docs I tried</p> <pre><code>p=ggplot(tore, aes(x =datetime, y = 5)) p + geom_segment(aes(xend = datetime, yend = 5 + v), arrow = arrow(length = unit(0.1,"cm"))) </code></pre> <p>Getting this kind of figure. You can see x coordinate is datetime, how should I convert wind component to get xend? By now xend equals datetime but I would like something like "datetime + xwindcomp"</p> <p><img src="https://i.stack.imgur.com/QUoD2.png" alt="enter image description here"></p> <p>Thanks for your help</p>
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    1. COSee `geom_segment` and note that it has an `arrow` argument.
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    2. COcheck out calenderPlot() from the open air package, it might be of some help, even though it does not make time series.
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    3. CO`geom_segment( aes(x = 0, y = 0, xend = xend, yend = 0), line, arrow = arrow(type = "closed", angle = 23), colour = "red", size = 1.0)` is what I use to draw an arrow in a ggplot graph. Is that what you need to know? Btw: `arrow` is a function in the `grid` package.
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