[ncl-talk] Visualization of SAF NWC products
Athanasios Karagiannidis
thankar at live.com
Sat Feb 21 01:29:02 MST 2015
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 6.1.2is 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 80307Phone: 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 80307Phone: 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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