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Re: Hovmoller [message #94944 is a reply to message #94943]

Wed, 27 December 2017 18:52

Jim Pendleton
Messages: 165
Registered: November 2011

Senior Member

On Wednesday, December 27, 2017 at 1:30:05 PM UTC-7, laura...@gmail.com wrote:
> No disrespect intended, but what if we want to make said plot without using Coyote graphics?
>
>
> On Friday, July 25, 2014 at 1:49:02 PM UTC-7, David Fanning wrote:
>> tjc0010@uah.edu writes:
>>
>>> Well I have about 20 files and will want to show eastward propagation with time
>>
>> Ah, so you have more than one file. As Wesley says in the Princess
>> Bride, "Why didn't you mention the wheelbarrow among our assets the
>> first time?"
>>
>> Presumably these files contain data points at different times. Perhaps
>> you have 20 such times. Now we are getting somewhere!
>>
>> What you have to do is build up a 2D array by selecting for longitude
>> and saving the temperatures at those longitudes.
>>
>> ntimes = 20
>>
>> ; Read the first file, just to see how big array has to be.
>> ... read the data file, extract variables, etc.
>> lonIndices = where(lons gt -25 and lons lt 40)
>>
>> ; Temperature at longitude and time
>> data = FltArr(N_Elements(lonIndices), ntimes)
>> temps = temps[lonIndices]
>> times = FltArr(ntimes)
>>
>> ; Read the files in a loop and extract info for Hovmoller plot.
>> for j=0,19 DO BEGIN
>> ... Read file, extract variables, etc.
>> times = time[0]
>> data[*,j] = temps[lonIndices]
>> endfor
>>
>> Now, make your plot...
>>
>> cgContour, data, times, lons[lonIndices], ... ; Hovmoller plot
>>
>> Cheers,
>>
>> David
>> --
>> David Fanning, Ph.D.
>> Fanning Software Consulting, Inc.
>> Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
>> Sepore ma de ni thue. ("Perhaps thou speakest truth.")

IDL has a built-in CONTOUR function that doesn't rely on the David's Coyote library.

https://www.harrisgeospatial.com/docs/contour.html

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[Message index]

		Hovmoller By: tjc0010 on Thu, 24 July 2014 12:39
		Re: Hovmoller By: David Fanning on Fri, 25 July 2014 06:36
		Re: Hovmoller By: tjc0010 on Fri, 25 July 2014 11:27
		Re: Hovmoller By: David Fanning on Fri, 25 July 2014 11:47
		Re: Hovmoller By: tjc0010 on Fri, 25 July 2014 12:41
		Re: Hovmoller By: David Fanning on Fri, 25 July 2014 13:20
		Re: Hovmoller By: tjc0010 on Fri, 25 July 2014 13:22
		Re: Hovmoller By: David Fanning on Fri, 25 July 2014 13:49
		Re: Hovmoller By: laura.hike on Wed, 27 December 2017 12:30
		Re: Hovmoller By: Jim Pendleton on Wed, 27 December 2017 18:52
		Re: Hovmoller By: laura.hike on Fri, 29 December 2017 14:22
		Re: Hovmoller By: tjc0010 on Mon, 28 July 2014 12:41

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