[R] Plotting tidal speed and direction in R

[David Winsemius]

On Jun 16, 2012, at 3:18 PM, Charles Berry wrote:

> zoeita <zoe-allcock <at> live.co.uk> writes:
>
>>
>> Hi,
>>
>> I have had a look around the forums and I can't seem to find  
>> anything that
>> works with my data.  I have lats, longs, time, tidal speed and  
>> direction and
>> need to plot this in an xy plot to determine changes over time.  
>> contour and
>> cloud have been recommended to me as a way to do this but I can't  
>> figure out
>> how to get 5 dimensions into this.  I want lat and long as my x and  
>> y, time
>> as my z, direction as w and speed as different colours.  I imagine  
>> it's a
>> lot easier than I think it is - I am very new to R.  Could anyone  
>> please
>> help with a starting point for this?
>
> See
>
> http://blog.revolutionanalytics.com/2012/03/see-the-wind.html
>
> and the links therein.

I suggest looking at 'arrow.plot' in package 'fields'. It will not be  
colored, but rather placing oriented arrows whose length is  
proportional to velocity. Your request for x, y, time coordinates may  
also lead you to the 'rgl' package, or to the 'animation' package.

-- 


David Winsemius, MD
West Hartford, CT