[ncl-talk] joint-histogram

Tue Oct 17 05:46:10 MDT 2017

Hi Barry,

I’m doing some diagnosing of my COSP installation in IFS. I’m looking at CF, COT, CTP, and CLD re.

The image is one made by R Pincus where he made a joint-histogram of the CTP and CLD re but instead of tracking the relative occurrence (CTP,RE) in each bin, he tracked the and plotted the CF instead. I think I know how to do this but I’m caught up in some other things at the moment to do some exploratory work on it. But if you have something that can create this plot, myself and at least 1 other NCL user would love it if you could share. Perhaps even contribute it to NCL.

You can find the plot here: https://climatedataguide.ucar.edu/climate-data/isccp-international-satellite-cloud-climatology-project

Best,

/M

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Marston S. Ward, PhD

Department of Earth Sciences

University of Gothenburg, Sweden

Email: marston.johnston at gu.se

SkypeID: marston.johnston 

Phone: +46-31-7864901 

Only the fruitful thing is true!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

From: Barry Lynn <barry.h.lynn at gmail.com>
Date: Tuesday, 17 October 2017 at 13:37
To: Marston Johnston <shejo284 at gmail.com>
Cc: Mary Haley <haley at ucar.edu>, "ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
Subject: Re: [ncl-talk] joint-histogram

Hi Marston:

I made some histogram plots of WRF output data vs observations.  However, I can't see your figure, so I am not sure what I did would be helpful to you.

Barry

On Mon, Oct 16, 2017 at 10:48 PM, Marston Johnston <shejo284 at gmail.com> wrote:

Hi Mary & Dennis,

The table looks like a good place to start. 

I’m currently unaware of a cloud fraction that is calculated from optical depth and cloud top pressure. 

However, I do have data for all there, i.e., I have ctp, cf, and cot (optical depth).

I’ll take a look at the table tomorrow. 

Thanks guys ☺

Best,

/M

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Marston S. Ward, PhD

Department of Earth Sciences

University of Gothenburg, Sweden

Email: marston.johnston at gu.se

SkypeID: marston.johnston 

Phone: +46-31-7864901 

Only the fruitful thing is true!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

From: Mary Haley <haley at ucar.edu>
Date: Monday, 16 October 2017 at 21:31
To: Marston Johnston <shejo284 at gmail.com>
Cc: Dennis Shea <shea at ucar.edu>, "ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
Subject: Re: [ncl-talk] joint-histogram

Marston,

Take a look at this page:

http://www.ncl.ucar.edu/Applications/table.shtml

These are examples showing how to draw filed cells (square or triangle) based on some criteria.  I think table_4.ncl colors the cells by ranges of values.

--Mary

On Mon, Oct 16, 2017 at 1:03 PM, Marston Johnston <shejo284 at gmail.com> wrote:

Hi Dennis,

At first glance it would appear so, but example 6 calculates the percentage. In the ucar example: 

https://climatedataguide.ucar.edu/climate-data/isccp-international-satellite-cloud-climatology-project 

The ISCCP cloud fraction is calculated for each bin instead of density of the frequency of occurrence. So in example 6 there are 2 datasets that are used as input data, but in the figure in question seems to use 3. 

/M

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Marston S. Ward, PhD

Department of Earth Sciences

University of Gothenburg, Sweden

Email: marston.johnston at gu.se

SkypeID: marston.johnston 

Phone: +46-31-7864901 

Only the fruitful thing is true!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

From: ncl-talk <ncl-talk-bounces at ucar.edu> on behalf of Dennis Shea <shea at ucar.edu>
Date: Monday, 16 October 2017 at 20:53
To: Marston Ward <marston.johnston at gu.se>
Cc: "ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
Subject: Re: [ncl-talk] joint-histogram

I am not a graphics person.

Looks like example 6
https://www.ncl.ucar.edu/Applications/pdf.shtml

===

Really, a contour plot with raster mode.

On Mon, Oct 16, 2017 at 12:46 PM, Marston Ward <marston.johnston at gu.se> wrote:

Hi guys!

I’m trying to develop a NCL script to produce the attached figure, which is a joint-histogram, but a bit different from what pdfxy produces.

I have a good idea of how this image is produced; but why reinvent the wheel? I don’t think that NCL has such a plot function, or am I mistaken?

Does anyone have such a script – and would like to share?

This is something I can definitely think of contributing to the NCL. 

Best,

/M

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Marston S. Ward, PhD

Department of Earth Sciences

University of Gothenburg, Sweden

Email: marston.johnston at gu.se

SkypeID: marston.johnston 

Phone: +46-31-7864901 

Only the fruitful thing is true!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

_______________________________________________
ncl-talk mailing list
ncl-talk at ucar.edu
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk

_______________________________________________ ncl-talk mailing list ncl-talk at ucar.edu List instructions, subscriber options, unsubscribe: http://mailman.ucar.edu/mailman/listinfo/ncl-talk 

_______________________________________________
ncl-talk mailing list
ncl-talk at ucar.edu
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk

_______________________________________________
ncl-talk mailing list
ncl-talk at ucar.edu
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk

-- 

Barry H. Lynn, Ph.D

Senior Lecturer,

The Institute of the Earth Science, 
The Hebrew University of Jerusalem, 
Givat Ram, Jerusalem 91904, Israel 

Tel: 972 547 231 170
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
US 914 432 3108

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20171017/7905ce9b/attachment.html>