[ncl-talk] Visualization of SAF NWC products
Mary Haley
haley at ucar.edu
Sat May 30 15:34:05 MDT 2015
Dear Sakis,
Can you provide the data and the latest script that you are using, so we
can take a look? You can use our ftp if you don't have a place to put it:
http://www.ncl.ucar.edu/report_bug.shtml#HowToFTP
--Mary
On Thu, May 28, 2015 at 2:05 AM, Athanasios Karagiannidis <thankar at live.com>
wrote:
> Good morning to all!
>
>
>
> Following the earlier conversation (to which I respond) I think I have the
> obligation to clarify some issues, since these conversations are available
> to all users, and they are used to solve various kinds of problems.
>
> After doing some more tests, I found out that the otherwise elegant and
> technically flawless script that was kindly prepared for me, does not
> illustrates correctly the CTTH_HEIGHT field. The problem is related to the
> fact that the line/column space of the raster data does not refer to a
> regular lat/lon space. In simple words the pixels of the raster data are
> not equal in lat/lon dimensions.
>
>
>
> Regarding more technical issues:
>
> XGEO_LOW_RIGHT, XGEO_UP_LEFT, YGEO_LOW_RIGHT, YGEO_UP_LEFT are not given
> in degrees but in meters.
>
>
>
> dims = dimsizes(CT) , lat = fspan(minLat, maxLat, dims(0)) and lon =
> fspan(minLon, maxLon, dims(1)) are producing a regular grid (which is
> not correct)
>
>
>
> It would be really helpful if a script could project correctly Meteosat
> fields (I think safnwc is using the Meteosat grid) but I’m not sure that
> such a thing exists.
>
>
>
> Kind regards
>
>
>
> Sakis
>
> Athanasios F. Karagiannidis
> Physicist, PhD Meteorology and Climatology
> E-mail: thankar at live.com
>
>
>
> ------------------------------
> From: thankar at live.com
> To: haley at ucar.edu
> Date: Sat, 21 Feb 2015 08:29:02 +0000
> CC: ncl-talk at ucar.edu
> Subject: Re: [ncl-talk] Visualization of SAF NWC products
>
> Mary, thank you for your input!
>
> Sakis
>
> Athanasios F. Karagiannidis
> Physicist, PhD Meteorology and Climatology
> E-mail: thankar at live.com
>
>
>
> ------------------------------
> Date: Fri, 20 Feb 2015 09:46:02 -0700
> Subject: Re: [ncl-talk] Visualization of SAF NWC products
> From: haley at ucar.edu
> To: thankar at live.com
> CC: huangwei at ucar.edu; ncl-talk at ucar.edu
>
> The issue with "namedcolor2rgb" is not really an issue. The code should
> still work. The error message is just misleading, but can be ignored.
>
> We have fixed the incorrect error message for the V6.3.0 release coming
> next month.
>
> --Mary
>
>
> On Fri, Feb 20, 2015 at 1:46 AM, Athanasios Karagiannidis <
> thankar at live.com> wrote:
>
> Wei,
>
> Your help is more than appreciated.
>
> I will update my NCL version.
>
> Kind regards
>
> Sakis
>
> Athanasios F. Karagiannidis
> Physicist, PhD Meteorology and Climatology
> E-mail: thankar at live.com
>
>
>
> ------------------------------
> From: huangwei at ucar.edu
> Date: Thu, 19 Feb 2015 09:23:14 -0700
>
> Subject: Re: [ncl-talk] Visualization of SAF NWC products
> To: thankar at live.com
> CC: ncl-talk at ucar.edu
>
> Sakis,
>
> Attached is script which looks more like what you see with HDFview,
> but used a whole user-defined color table.
>
> "gsdtol" is a standard color-table name, in NCL 6.2.1. Your NCL of 6.1.2
> is a little bit old, and I strongly suggest you update your NCL to the
> newest version.
>
> Compare the newly attached script and the script before,
> you'll be able to figure out that the difference is the projection applied.
> So you can turn on/off those options based on your requirement.
>
> A new png file is attached as well.
>
> Regards,
>
> Wei
>
>
>
> ================================================
> 1850 Table Mesa Dr.
> Boulder, CO 80307
> Phone: 303-497-8924
>
> On Thu, Feb 19, 2015 at 4:07 AM, Athanasios Karagiannidis <
> thankar at live.com> wrote:
>
> Dear Wei
>
> I'm more than thankful for your script! It is excellent in correctly
> reading my data and more or less what i wanted regarding the visualization.
> I have just 3 comments:
> 1. I would really like to see the drawn field (in example the CT) even
> over land. How can i do this?
> 2. When i run the script in my machine i get the following warnings:
>
>
>
> *(0) Warning: namedcolor2rgb: 'gsdtol' is not a valid named
> color.(0) Will return missing values for this color.*
> Is 'gsdtol' a custom made color? In this case maybe i should replace it.
>
> 3. In the example HDFView visualization i provided the grid was not
> "tilted" to the left (a projection issue i guess!). How should i make your
> visualization, so it looks like the HDFView one?
>
> Thank you in advance!
>
> Sakis
>
> Athanasios F. Karagiannidis
> Physicist, PhD Meteorology and Climatology
> E-mail: thankar at live.com
>
>
>
> ------------------------------
> From: huangwei at ucar.edu
> Date: Wed, 18 Feb 2015 13:26:21 -0700
> Subject: Re: [ncl-talk] Visualization of SAF NWC products
> To: thankar at live.com
> CC: ncl-talk at ucar.edu
>
>
> Sakis,
>
> You may take a look of the attached script and pdf file to see if these
> are what you wanted.
>
> Thanks,
>
> Wei
>
>
>
> ================================================
> 1850 Table Mesa Dr.
> Boulder, CO 80307
> Phone: 303-497-8924
>
> On Wed, Feb 18, 2015 at 1:38 AM, Athanasios Karagiannidis <
> thankar at live.com> wrote:
>
> Dear sirs/madams
>
> I want to visualize SAF NWC output data using ncl. They are included in an
> h5 file.
> These data are not in a simple lat-lon grid.
> After an earlier contact with you i managed to visualize them by creating
> such a grid, but i feel that the image is not accurate.
> What i want to help me with, is to tell me weather there is a standard way
> or an already existing script to visualize correctly that kind of data.
> To help you I provide the following:
>
> 1. A sample datafile.
> 2. The printVarSummary output
> 3. A screenshot of the HDFView visualization of the variable where the
> Variable info are shown (more or less the same info with printVarSummary).
> 4. The script i used (although, i do not think that you need that!). The
> lat/lon limits that i have n my script are not acurate. I used them to make
> the visualization.
>
>
> ---------- printVarSummary------------------------------
>
> ncl 2> printVarSummary(CT)
>
> Variable: CT
> Type: ubyte
> Total Size: 370688 bytes
> 370688 values
> Number of Dimensions: 2
> Dimensions and sizes: [DIM_000 | 512] x [DIM_001 | 724]
> Coordinates:
> Number Of Attributes: 11
> CLASS : IMAGE_INDEXED
> ID : CTTH_HEIGHTED
> IMAGE_COLORMODEL : RGBH_HEIGHTED
> IMAGE_SUBCLASS : IMAGE_INDEXED
> IMAGE_VERSION : 1.0GE_INDEXED
> N_COLS : 724
> N_LINES : 512
> OFFSET : -2000
> PALETTE : ��8�3
> PRODUCT : CTTHE_INDEXED
> SCALING_FACTOR : 200
>
>
> ---------------------------------------------------------------------------------
>
> ---------------- My Script
> ---------------------------------------------------
>
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
>
> begin
> cdf_file = addfile("SAFNWC_MSG2_CTTH_200812121100_Greece______.h5","r")
> CT = cdf_file->CTTH_HEIGHT(:,:)
>
> res = True
>
> lat = fspan(50,20,512) ; A.K. -- reverse the matrix
> lon = fspan(10,30,724)
> CT!0 = "lat" ;-- set name of CT dimension 0
> CT!1 = "lon" ;-- set name of CT dimension 1
> CT&lat = lat ;-- assign lat array to CT
> CT&lon = lon ;-- assign lon array to CT
> CT&lat at units = "degrees_north" ;-- set the units of the named
> coordinate lat
> CT&lon at units = "degrees_east" ;-- set the units of the named
> coordinate lon
>
> res at gsnAddCyclic = False
> res at tiMainString = "Default Color" ; main title
> res at cnFillOn = True ; turn on color fill
> res at mpMaxLatF = 50 ; choose
> subregion
> res at mpMinLatF = 20
> res at mpMaxLonF = 30
> res at mpMinLonF = 10
>
> xwks = gsn_open_wks("pdf","CloudTops")
> plot = gsn_csm_contour_map(xwks,CT,res)
> end
>
>
> --------------------------------------------------------------------------------
>
> Thank you in advance.
>
>
> Sakis
>
>
>
>
> Athanasios F. Karagiannidis
> Physicist, PhD Meteorology and Climatology
> E-mail: thankar at live.com
>
>
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