Re: Could NCL do some classified post map?

A good example of what Joel is pointing out can be found here:
http://www.ncl.ucar.edu/Applications/station.shtml

Take a look at example #2, I believe it does exactly what you need.
Good luck,
Adam

Joel Norris wrote:
> Use the gsn_polymarker function while setting gsMarkerSizeF according to
> the variable value.
>
>
>>Hello,
>>
>> I am making a map of trend distribution for some seperate points.
>>I wanna know if NCL can do some classified posted map just as in Grads
>>or other software. £¨The classified posted effect is that using some
>>symbols to represent variable with the their size varying according to
>>the value of variables)
>>
>>Thanks
>> Leo_Aries
>>
>>
>>
>>======= 2006-01-16 14:00:18 ÄúÔÚÀ´ÐÅÖÐдµÀ£º=======
>>
>>
>>>Hello,
>>>
>>>I am appending a modified script. The output looks ok to me.
>>>
>>>The reason for so many "little holes" is that you chose
>>>a color map ["testcmap"] that has white right in the
>>>middle of the data. This lead to both valid values
>>>and _FillValue [missing values] to be white [transparent].
>>>
>>>It does look like their are more missing values at higher latitudes.
>>>
>>>I also modified the ascii data you were outputting.
>>>
>>>good luck
>>>D
>>>
>>>On Sun, 15 Jan 2006, David Atkinson wrote:
>>>
>>>
>>>>Hi, I am trying to read an HDF4 file with QuikScat marine winds.
>>>>I have a reader that largely works and seems to plot what is a
>>>>reasonable result, that is, winds over the ocean and not over
>>>>the land. However the windfield data are interspersed with little
>>>>holes where the wind value drops to zero. When plotted, there
>>>>is a certain pattern to the drop outs that makes it look like some
>>>>sort of offset problem in lat/long, however the land boundaries
>>>>are correct; these would also be messed up if there were an
>>>>offset. I'll check with JPL as well, because it could be a Quikscat
>>>>or HDF writing issue from their end, but in the chance it is an
>>>>ncl issue, I am posting it here to see if anyone has an idea or if
>>>>they have worked with this format before and have seen this.
>>>>
>>>>The ncl program to read and subset the data is here:
>>>>http://www.frontier.iarc.uaf.edu/~datkinson/QuikScat_reading/read_HDF_quikscat.ncl
>>>>
>>>>and a test data file from JPL is here:
>>>>http://www.frontier.iarc.uaf.edu/~datkinson/QuikScat_reading/QS_XWGRD3_2003120.20031231631.hdf
>>>>
>>>>Thanks for any ideas,
>>>
>>>_______________________________________________
>>>ncl-talk mailing list
>>>ncl-talk_at_ucar.edu
>>>http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>
>>= = = = = = = = = = = = = = = = = = = =
>>
>>
>>¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ÖÂ
>>Àñ£¡
>>
>>
>>¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Leo Xiang
>>¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Leo_Aries_at_tom.com
>>¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2006-01-19
>>
>>
>>_______________________________________________
>>ncl-talk mailing list
>>ncl-talk_at_ucar.edu
>>http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
>
>
>

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Adam Phillips			             asphilli_at_ucar.edu
National Center for Atmospheric Research   tel: (303) 497-1726
ESSL/CGD/CAS                               fax: (303) 497-1333
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