Re: Polar Vector Plots

O.k. I see the issue now. This is related to an earlier problem I had with
missing values in the coordinate arrays. We have an issue with parallel
input/output where we get missing values in the coordinate arrays. We don't
have a way around this at present. So, the short term solution is to modify
the sea ice diagnostic package to use separate grid variables. Sorry to
raise the alarm bells and it does not appear to be an issue with the
thinning algorithm.

Dave


On Wed, Jun 11, 2014 at 2:30 PM, David Bailey <dbailey@ucar.edu> wrote:

> I will work up a simpler script that demonstrates the issue.
>
> Dave
>
>
> On Wed, Jun 11, 2014 at 2:27 PM, David Brown <dbrown@ucar.edu> wrote:
>
>> I agree that the last one looks better. Do you think still think there is
>> a problem though? If so, we would need some scripts and data to reproduce
>> it. But it's also true that getting the best results for these resources is
>> a bit of a trial and error process.
>> -dave
>>
>>
>>
>> On Wed, Jun 11, 2014 at 1:51 PM, David Bailey <dbailey@ucar.edu> wrote:
>>
>>> Note that I just reduced vcMinDistanceF to 0.01 and the results are much
>>> better.
>>>
>>> Dave
>>>
>>>
>>> On Wed, Jun 11, 2014 at 1:29 PM, David Bailey <dbailey@ucar.edu> wrote:
>>>
>>>> Hi Dave,
>>>>
>>>> I have attached some before and after plots. These are not exactly the
>>>> same run, but I think it demonstrates the issue. The one with "-1" is the
>>>> newer one.
>>>>
>>>> Dave
>>>>
>>>>
>>>> On Wed, Jun 11, 2014 at 1:23 PM, David Brown <dbrown@ucar.edu> wrote:
>>>>
>>>>> Hi Dave,
>>>>> The behavior of these resources should not have changed. If you are
>>>>> getting different results now, can you send a sample code that we could use
>>>>> to reproduce the issue? It would also help if you have a graphic of what
>>>>> you used to get.
>>>>> -dave
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Jun 11, 2014 at 1:15 PM, David Bailey <dbailey@ucar.edu>
>>>>> wrote:
>>>>>
>>>>>> Hi there,
>>>>>>
>>>>>> I seem to revisit this in the ice diagnostics every year. I regularly
>>>>>> generate polar projection vector/contour plots of the sea ice velocities. I
>>>>>> have typically used the resource:
>>>>>>
>>>>>> res@vcMinDistanceF = 0.018
>>>>>>
>>>>>> but recently, this does not seem to be working as well for me. So I
>>>>>> am considering subsampling my data as an alternative:
>>>>>>
>>>>>> uplot = uvel(::thin,::thin)
>>>>>> vplot = vvel(::thin,::thin)
>>>>>>
>>>>>> where thin is 2 or 3. This doesn't really give me the desired result
>>>>>> either. I wondered what other people have done in this sort of example. I
>>>>>> also seem to be getting an interaction between vcMinDistanceF and
>>>>>> vcRefMagnitudeF, where I am losing all vectors north and south of 60N/S.
>>>>>>
>>>>>> Dave
>>>>>>
>>>>>> --
>>>>>>
>>>>>> David A Bailey email:
>>>>>> dbailey_at_ucar.edu
>>>>>> National Center for Atmospheric Research phone: 303-497-1737
>>>>>> PO Box 3000 fax :
>>>>>> 303-497-1700
>>>>>> Boulder, CO 80307-3000
>>>>>> http://www.cgd.ucar.edu/staff/dbailey
>>>>>>
>>>>>> _______________________________________________
>>>>>> ncl-talk mailing list
>>>>>> List instructions, subscriber options, unsubscribe:
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>>>>>>
>>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>>
>>>> David A Bailey email:
>>>> dbailey_at_ucar.edu
>>>> National Center for Atmospheric Research phone: 303-497-1737
>>>> PO Box 3000 fax :
>>>> 303-497-1700
>>>> Boulder, CO 80307-3000
>>>> http://www.cgd.ucar.edu/staff/dbailey
>>>>
>>>
>>>
>>>
>>> --
>>>
>>> David A Bailey email:
>>> dbailey_at_ucar.edu
>>> National Center for Atmospheric Research phone: 303-497-1737
>>> PO Box 3000 fax :
>>> 303-497-1700
>>> Boulder, CO 80307-3000
>>> http://www.cgd.ucar.edu/staff/dbailey
>>>
>>
>>
>
>
> --
>
> David A Bailey email:
> dbailey_at_ucar.edu
> National Center for Atmospheric Research phone: 303-497-1737
> PO Box 3000 fax :
> 303-497-1700
> Boulder, CO 80307-3000
> http://www.cgd.ucar.edu/staff/dbailey
>



--

David A Bailey email:
dbailey_at_ucar.edu
National Center for Atmospheric Research phone: 303-497-1737
PO Box 3000 fax :
303-497-1700
Boulder, CO 80307-3000
                   http://www.cgd.ucar.edu/staff/dbailey

Received on Wed Jun 11 08:56:49 2014