[R] How to plot wind direction and strength field

Jenny Barnes jmb at mssl.ucl.ac.uk
Tue Apr 29 14:26:27 CEST 2008

Thanks Jim - here is some data:

u <- array(NA,c(5,8))
t <- seq(from=0.5, to=0.11,length=15)
t2 <- seq(from=(-0.7),to=(-0.1),length=25)
u[1:15] <- t
u[16:40] <- t2
v <- array(NA,c(5,8))
y <- seq(from=(-0.9), to=(-0.01),length=40)
v[1:40] <- y

I've made up the data but it's similar magnitude and the longitude 
direction is u and latitude direction is v as in the real data.

I really appreciate your help!


On Tue, 29 Apr 2008, Jim Lemon wrote:

> Jenny Barnes wrote:
>> Hi Jim,
>> I would like to plot something like figure 2 on this webpage:
>> http://www.cnrfc.noaa.gov/storm_summaries/jan1997storms.php
>> My data is very large - covering the whole globe at 2.5deg resolution so 
>> longitude=144 girds, latitude=73 grids and time=32 years - hard to give you 
>> that data......Would it help to give you a couple of grid squares worth of 
>> data for one year?
> Okay, Figures 2 and 3 look like 5 degree squares, and given a larger plot, 
> 2.5 degree should be okay. Do you want curved arrows? That would take some 
> programming as the standard arrows are straight. Also, the arrows in the 
> figures all seem to be the same length. I can make the lengths proportional 
> to wind speed. Yes, some data would be helpful, as getting the right plot 
> usually involves trying out real data. Doesn't matter if it's faked as long 
> as it has the same format and similar numbers to the real thing.
> Jim

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