Re: Plotting concave data

Hi Mary,

Very impressive. This looks perfect. Thank you so much!

Best wishes,

Jeff

On Tue, Mar 27, 2012 at 9:49 AM, Mary Haley <haley@ucar.edu> wrote:
>
> On Mar 27, 2012, at 10:09 AM, Jeff Steward wrote:
>
>> Hi Mary,
>>
>> Thank you.  This looks quite a bit better.  There is still about half
>> of the concave area filled in, but I could probably live with this
>> amount if we can't find a better solution.
>>
>> Alternately I may go to plotting colored scatter data to avoid
>> contouring altogether.  It won't be as pretty, but it will be more
>> accurate.  Do you have any suggestions about the best function to use
>> for this purpose?
>>
>> Thank you again very much for your time.  Best wishes,
>
>
> Jeff,
>
> I put together a scatter plot quickly and attached a sample image. You will likely need to change the code to get the colors and levels to your liking.
> Also, I used NhlNewMarker to define a filled square as a marker. You can use any one of the characters in our font tables as a marker
> (the filled square was font table #35, character "y").
>
> http://www.ncl.ucar.edu/Document/Graphics/font_tables.shtml
>
> Click on any font table line to see all the characters for that table. Or, you can use one of our predefined markers:
>
> http://www.ncl.ucar.edu/Document/Graphics/Images/markers.png
>
> Also, I didn't have time to create a label bar, but there are some examples at
>
> http://www.ncl.ucar.edu/Applications/labelbar.shtml
>
> Example 11 might be the best one.
>
> --Mary
>
>
>
>
>
>>
>> Jeff
>>
>> On Tue, Mar 27, 2012 at 7:47 AM, Mary Haley <haley@ucar.edu> wrote:
>>> Hi Jeff,
>>>
>>> Thanks for providing your files.  Dave will probably look into this further, but one thing I tried was "raster" fill instead of the default "area" fill:
>>>
>>>  opts@cnFillMode           = "RasterFill"
>>>  opts@cnRasterSmoothingOn  = True
>>>
>>>
>>> You can try setting cnRasterSmoothingOn to False (the default behavior) to see the "blocky" rasters.
>>>
>>> BTW, you can use the special "short2flt" function on your raw data to have it automatically apply the scale and offset:
>>>
>>>  val_low_raw =  short2flt(raw->lowResCh)
>>>  val_high_raw = short2flt(raw->highResCh)
>>>
>>> However, this won't get you the results that your script expects, because "short2flt" actually *multiples* the scale factor rather than divide by it.
>>>
>>> --Mary
>>>
>>>
>>> On Mar 26, 2012, at 8:27 PM, Jeff Steward wrote:
>>>
>>>> I have uploaded my file as "plotBT-raw.ncl" and my example HDF file as
>>>> "1B11.20100831.72869.7.HDF" under the incoming directory.  Thank you.
>>>> Best wishes, Jeff
>>>>
>>>> On Mon, Mar 26, 2012 at 4:57 PM, David Brown <dbrown@ucar.edu> wrote:
>>>>> You would need to send us your script and the necessary data (or a link to an accessible data server) for us to help you.
>>>>> See the "Report bugs" page under Support on the NCL web site for instructions on uploading scripts and dasta.
>>>>>  -dave
>>>>>
>>>>>
>>>>> On Mar 26, 2012, at 4:11 PM, Jeff Steward wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> I need to plot level 1B data (brightness temperatures) from TRMM/TMI,
>>>>>> and I have had some measure of success using gsn_csm_contour_map.
>>>>>> However, each scan by TRMM is conical, and thus it creates a
>>>>>> non-convex path, like this:
>>>>>>
>>>>>> http://sharaku.eorc.jaxa.jp/ADEOS2/JAXA_TYP_DB/TYP_DB_TRMM/201008/07L/2A12.100829.72843.6.07L.EARL.png
>>>>>>
>>>>>> However, when I plot this with gsn_csm_contour_map, the concave
>>>>>> portion of the scan (the "U" shape at the back of the swath) is filled
>>>>>> in with interpolated, very poor quality values; I would much rather
>>>>>> just leave those values out.  As an example, over land the values
>>>>>> should obviously be around 300 K; with the interpolated values, the
>>>>>> temperature of the ocean and the land are mixed together.  Any ideas
>>>>>> about how I can make my plot more like the sharaku link above?
>>>>>>
>>>>>> Thank you for your time.  Best wishes,
>>>>>>
>>>>>> Jeff
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Received on Tue Mar 27 12:24:47 2012