Re: Polar Vector Plots

Okay, good to know. Missing coordinate values can definitely be problematic.
 -dave


On Wed, Jun 11, 2014 at 2:56 PM, David Bailey <dbailey@ucar.edu> wrote:

> 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:
>>>>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>>
>>>>> 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 09:04:03 2014