[ncl-talk] joint-histogram
Marston Johnston
shejo284 at gmail.com
Thu Nov 16 11:09:11 MST 2017
Hi Adam!
Thanks a lot :-) Now it’s perfect!
I made some small adjustment to reverse the y-axis for modis and isccp but not for misr.
I would never have figured out that 99 and -99 was the problem. Using the res at gsnYAxisIrregular2Linear = True, makes the figure better. I tried that also for x-axis and man was that weird-looking :-).
May I suggest adding the plot part of the script and the figure to the NCL plot archive for future users of COSP? I will add more script for plotting CloudSat and Calipso joint-histogram diagrams.
/M
Marston S. Ward
On 16 Nov 2017, 18:56 +0100, Adam Phillips <asphilli at ucar.edu>, wrote:
> Hi Marston,
> When I change your y definition to this:
> y := (/-2.0,0.0,0.5,1.0,1.5,2.0,2.5,3.0,4.0,5.0,7.0,9.0,11.0,13.0,15.0,17.0,19.0/)
> all is well. NCL seems to have trouble when you set the first value to -99 and the last value to 99, and I'm not clear as to why. Setting them to values closer to the other values in the array seemingly works. I have attached the resulting plot. Note that the space between each of those values on the Y-axis is the same in the misr_fq.png figure. If you set gsnYAxisIrregular2Linear = True the space will be proportional to the differences between the y values. See the attached misr_fq.2.png figure.
> Hope that helps!
> Adam
>
> > On Thu, Nov 16, 2017 at 10:30 AM, Marston Johnston <shejo284 at gmail.com> wrote:
> > > Hi again Adam,
> > >
> > > Thanks to your help/advice/explanation, I got the isccp and modis plots exactly how I want them :-)
> > > But I still cannot get misr to function properly (see attached). For the misr y axis, I want the labels to
> > > be: (/"NR","0","0.5","1.0","1.5","2.0","2.5","3.0","4.0","5.0","7.0","9.0","11.0","13.0","15.0","17.0"," “/), which is 1 greater than the y-coord in the misr array.
> > > Sadly, I still get the same error:
> > >
> > > "warning:_NhlCreateSplineCoordApprox: Attempt to create spline approximation for Y axis failed: consider adjusting trYTensionF value
> > > warning:IrTransInitialize: error creating spline approximation for trYCoordPoints; defaulting to linear"
> > >
> > > In this case, y is 1 greater than the I’m&hgt. What’s going on here that is different from the other 2 cases?
> > >
> > > /M
> > >
> > > Marston S. Ward
> > >
> > > On 16 Nov 2017, 17:40 +0100, Adam Phillips <asphilli at ucar.edu>, wrote:
> > > > Hi Marston,
> > > > I downloaded your dropbox file, but didn't see your script within the zip file or attached to your email. Can you send that?
> > > >
> > > > With regards to your questions about what sections of code are doing:
> > > > res at sfXArray = im&tau
> > > > res at sfYArray = im&pres
> > > >
> > > > Normally NCL uses coordinate variables attached to the array input into the graphical functions to determine where to plot the data in the graphical space. However, in the raster_plot.ncl script that Mary sent you the coordinate variables (x and y) are of size +1 greater than those dimensions of the im array. This necessitates the use of sfXArray/sfYArray to tell NCL how to plot the data. If the dimension sizes of your data matches those of the desired coordinate variables then you do not need to use sfXArray/sfYArray, assuming the coordinate variables are properly attached to the array.
> > > >
> > > > res at tmXBMode = "Explicit"
> > > > res at tmXBValues = im&tau
> > > > res at tmXBLabels = ""+im&tau
> > > >
> > > > res at tmYLMode = "Explicit"
> > > > res at tmYLValues = im&pres
> > > > res at tmYLLabels = im&pres+""
> > > >
> > > > Keep in mind that the above ONLY adjusts the tick marks and their labels. It has nothing to do with how the data is plotted in space. In the above, you are explicitly telling NCL where to put the major tickmarks (tmXBValues/tmYLValues) as well as how to label those major tickmarks. (tmXBLabels/tmYLLabels).
> > > >
> > > > With regards to your error message: I cannot tell what is going on without looking at the script. In my experience when I encounter a graphical error that doesn't look like it should be occurring, I will try to simplify the resource lists and/or the input data to see where the error is coming from, eliminating resources until the error message disappears, allowing me to see what is causing the issue.
> > > > Hope that helps!
> > > > Adam
> > > >
> > > >
> > > > > On Wed, Nov 15, 2017 at 5:32 PM, Marston Johnston <shejo284 at gmail.com> wrote:
> > > > > > Hi Mary,
> > > > > >
> > > > > > I appreciate your help with this and fixing that error. I got a bit frustrated at the end and therefore a bit sloppy.
> > > > > > I must say that I still do not fully understand the following features of the code, especially the addition of a string to the labels.
> > > > > >
> > > > > > res at sfXArray = im&tau
> > > > > > res at sfYArray = im&pres
> > > > > >
> > > > > > res at tmXBMode = "Explicit"
> > > > > > res at tmXBValues = im&tau
> > > > > > res at tmXBLabels = ""+im&tau
> > > > > > res at tiXAxisString = "Cloud Optical Depth"
> > > > > >
> > > > > > res at tmYLMode = "Explicit"
> > > > > > res at tmYLValues = im&pres
> > > > > > res at tmYLLabels = im&pres+""
> > > > > >
> > > > > > In the attached code, I’m calculating the weighted-mean of modis, isccp, and misr joint-histograms.
> > > > > > With your help, I’m able to get the isccp and modis figures to behave better but they are still off.
> > > > > > With these two figures, the contour doesn’t want to line up with the major tick marks.
> > > > > > The 3rd misr fig has a different set of y-axis values, and when I try to plot these I get:
> > > > > >
> > > > > > "warning:_NhlCreateSplineCoordApprox: Attempt to create spline approximation for Y axis failed: consider adjusting trYTensionF value
> > > > > > warning:IrTransInitialize: error creating spline approximation for trYCoordPoints; defaulting to linear”
> > > > > >
> > > > > > From what I’ve read of this error, it should not occur in my case.
> > > > > >
> > > > > > I could really use your help in nailing this down properly. Why is the contour off and my misr figure causing this error when I’m plotting the y-axis explicitly?
> > > > > > I’ve attached the faulty figures and included a link to the data below. There are a lot of small files but on my mac it goes quite fast (few seconds).
> > > > > >
> > > > > > https://www.dropbox.com/s/ian474obfp3amu1/fq_data.zip?dl=0
> > > > > >
> > > > > > Appreciate the help,
> > > > > >
> > > > > > /M
> > > > > >
> > > > > > Marston S. Ward
> > > > > >
> > > > > > On 14 Nov 2017, 18:05 +0100, Mary Haley <haley at ucar.edu>, wrote:
> > > > > > > Hi Marston,
> > > > > > >
> > > > > > > The reason you are seeing what looks like log values is because the Y coordinate array is irregularly spaced, and NCL by default will take your irregular Y axis values and place them linearly on the Y axis.
> > > > > > > I don't know if this is intentional, but you have:
> > > > > > > im!0 ="x"
> > > > > > > im!1 ="y"
> > > > > > > Dimension 0 is associated with the Y axis, and dimension 1 is the X axis. Just wanted to point that out, since you are calling dimension 0 "x", and dimension 1 "y". I changed this to:
> > > > > > > im!1 ="x"
> > > > > > > im!0 ="y"
> > > > > > > Which seems to make your plot match better with the one you attached.
> > > > > > > You can't make x a coordinate array, because it has one more element than the X dimension of your data.
> > > > > > >
> > > > > > > Instead, in order to associate the x and y values with your plot, use these special resources, which are mentioned in the raster_5.ncl example on the same page:
> > > > > > > res at sfXArray = x
> > > > > > > res at sfYArray = y
> > > > > > > Finally, you are going to get weird labels on your axes, because NCL is simply trying to put labels along the X axis where it thinks it makes sense. If you want the same labels on your axes as your actual x values, then set:
> > > > > > > res at tmXBMode = "Explicit"
> > > > > > > res at tmXBValues = x
> > > > > > > res at tmXBLabels = ""+x ; labels have to be strings
> > > > > > > See attached.
> > > > > > > --Mary
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > > On Mon, Nov 13, 2017 at 6:04 PM, Marston Johnston <shejo284 at gmail.com> wrote:
> > > > > > > > > Hi Mary,
> > > > > > > > >
> > > > > > > > > Thanks for the tips in the table. However, there is a better example:
> > > > > > > > >
> > > > > > > > > https://www.ncl.ucar.edu/Applications/raster.shtml
> > > > > > > > >
> > > > > > > > > However, I’m having some trouble with the finer details of the plot. It involves getting the tick labels just in the correct place.
> > > > > > > > >
> > > > > > > > > My code below is basically example 6, which looks very much like the same coordinate values of one of the iSCCP products:
> > > > > > > > >
> > > > > > > > > I’m trying to compare my model output with the above figure but there are some issue:
> > > > > > > > > 1.) In the ncl example 6, the figure dimension is 7x6 while mine is 7x7. When I plot it as below I get log x-axis despite my values not being log.
> > > > > > > > > 2.) None of the labels ended up on the major axis.
> > > > > > > > > I’m not sure how NCL axis works. Could I get some tips on how to force the axis to fall on the grid edges as in the figure above?
> > > > > > > > > im =
> > > > > > > > > (/(/0.60 0.81 1.86 3.83 3.09 0.78 0.01/), (/0.45 0.63 1.47 4.96 5.45 2.27 0.28/), \ (/0.60 0.66 0.88 2.03 2.45 1.56 0.50/),(/0.76 0.91 1.02 1.17 1.46 1.44 0.63/), \
> > > > > > > > > (/0.85 1.41 1.32 0.88 0.91 1.07 0.72/),(/1.55 1.84 1.24 0.70 0.41 0.46 0.36/), (/7.19 1.73 0.60 0.28 0.14 0.08 0.05/)/)
> > > > > > > > > x = (/0.0,0.3,1.3,3.6,9.4,23.0,60.0,100.0/)
> > > > > > > > > y = (/1000.0,800.0,680.0,560.0,440.0,310.0,180.0/)
> > > > > > > > > im!0=“x"
> > > > > > > > > im!1 =“y”
> > > > > > > > > im&x = x
> > > > > > > > > im&y = y
> > > > > > > > >
> > > > > > > > > wks = gsn_open_wks("png","raster") ; send graphics to PNG file
> > > > > > > > > res = True ; plot mods desired
> > > > > > > > > res at cnFillOn = True ; Turn on contour fill
> > > > > > > > > res at cnFillMode = "RasterFill" ; Turn on raster fill
> > > > > > > > > res at cnLinesOn = False ; Turn off contour lines
> > > > > > > > > res at cnLineLabelsOn = False ; turns off contour line labels
> > > > > > > > > res at cnFillPalette = "BlAqGrYeOrReVi200";MPL_viridis"
> > > > > > > > > res at lbLabelBarOn = True
> > > > > > > > > res at lbOrientation = "vertical" ; vertical label bar
> > > > > > > > >
> > > > > > > > > plot = gsn_csm_contour(wks,im,res) ; contour the variable
> > > > > > > > >
> > > > > > > > > Best,
> > > > > > > > > /M
> > > > > > > > >
> > > > > > > > > Marston S. Ward
> > > > > > > > >
> > > > > > > > > On 16 Oct 2017, 21:31 +0200, Mary Haley <haley at ucar.edu>, wrote:
> > > > > > > > > > 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!
> > > > > > > > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > > > > > > > > > >
> > > > > > > > > > > > >
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> > > >
> > > > --
> > > > Adam Phillips
> > > > Associate Scientist, Climate and Global Dynamics Laboratory, NCAR
> > > > www.cgd.ucar.edu/staff/asphilli/ 303-497-1726
> > > >
>
>
>
> --
> Adam Phillips
> Associate Scientist, Climate and Global Dynamics Laboratory, NCAR
> www.cgd.ucar.edu/staff/asphilli/ 303-497-1726
>
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